what will be the final temperature of a 10.0 g piece of iron (specific heat is 0.450 j/g·) initially at 25°c, if it is supplied with 9.5 j of heat?

Answers

Answer 1

Hi! I'd be happy to help you with your question.

To find the final temperature of the iron piece, we can use the formula:

q = mcΔT

where:
q = heat supplied (9.5 J)
m = mass of iron (10.0 g)
c = specific heat of iron (0.450 J/g·°C)
ΔT = change in temperature (final temperature - initial temperature)

First, we need to solve for ΔT:

9.5 J = (10.0 g) × (0.450 J/g·°C) × ΔT

To find ΔT, divide both sides by the product of mass and specific heat:

ΔT = 9.5 J / (10.0 g × 0.450 J/g·°C) = 2.11°C

Now, we can find the final temperature by adding the initial temperature to the change in temperature:

Final temperature = initial temperature + ΔT = 25°C + 2.11°C = 27.11°C

So, the final temperature of the 10.0 g piece of iron is 27.11°C when supplied with 9.5 J of heat.

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Related Questions

an ideal gas expands from 28.0 l to 92.0 l at a constant pressure of 1.00 atm. then, the gas is cooled at a constant volume of 92.0 l back to its original temperature. it then contracts back to its original volume without changing temperature. find the total heat flow, in joules, for the entire process.

Answers

The event of energy being converted into particles and antiparticles occurred when the universe was less than one second old. During this time, the universe was a hot, dense soup of particles, including quarks, leptons, and photons.

The universe began with the Big Bang, which occurred approximately 13.8 billion years ago. At this time, the universe was a hot, dense soup of particles, including quarks, leptons, and photons. The first event to occur after the Big Bang was the conversion of energy into particles and antiparticles. This process, known as particle-antiparticle annihilation, occurred when the universe was less than one second old. Next, protons and neutrons fused to form nuclei such as deuterium and helium. This process, known as nucleosynthesis, occurred when the universe was between one and three minutes old. After nucleosynthesis, the universe consisted of a hot, dense plasma of charged particles. Over time, the universe expanded and cooled, allowing electrons to settle down around nuclei and form neutral atoms. This process, known as recombination, occurred when the universe was approximately 380,000 years old.

Once recombination occurred, the universe became transparent to radiation, allowing light to travel freely through space. This radiation is known as the cosmic microwave background and is observed today as a faint glow in the sky. Finally, stars and galaxies began to form from the clumps of matter that had been created during nucleosynthesis. The first stars are thought to have formed when the universe was approximately 100 million years old. The Milky Way galaxy, which contains our solar system, is estimated to have formed about 13.6 billion years ago, making it one of the oldest galaxies in the universe.

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The total heat flow for the entire process is zero. This is because the process is a closed cycle, where the gas expands and cools, then contracts back to its original volume without any change in temperature.

To explain further, during the first stage of the process where the gas expands from 28.0 l to 92.0 l at a constant pressure of 1.00 atm, the gas does work on its surroundings and absorbs heat from its surroundings to maintain a constant temperature. This is known as an isothermal process.
During the second stage, where the gas is cooled at a constant volume of 92.0 l back to its original temperature, the gas releases heat to its surroundings to maintain a constant volume. This is known as an isochoric process.
During the final stage of the process, where the gas contracts back to its original volume without changing temperature, the gas does work on its surroundings and releases heat to maintain a constant temperature. This is known as an isothermal process.
Since the process is a closed cycle, the total work done by the gas is equal to the total heat absorbed and released by the gas. Therefore, the total heat flow for the entire process is zero.
The total heat flow for the entire process is zero because the process is a closed cycle and the work done by the gas is equal to the heat absorbed and released by the gas.

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An elevator weighing 2400 N ascends at a constant speed of 7.0 m/s. How much power must the motor supply to do this?

Answers

The motor must supply 16.8kW of power.

Explain power.

The quantity of energy transferred or transformed per unit of time is known as power. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Power is the pace at which work is completed or energy is delivered; it can be expressed as the product of work completed (W) or energy transferred (E) divided by time (t).

F is 2400N

v is 7m/s

Power will be 2400*7 i.e. 16,800W.

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A current-carrying rectangular coil of wire is placed in a magnetic field. The magnitude of the torque on the coil is NOT dependent upon which one of the following quantities?
(a) the direction of the current in the loop
(b) the magnitude of the current in the loop
(c) the area of the loop
(d) the orientation of the loop
(e) the magnitude of the magnetic field

Answers

The magnitude of the torque on the coil is NOT dependent upon (b) the magnitude of the current in the loop.

Understanding the torque on the coil

The torque on the coil is directly proportional to the product of the magnetic field strength and the area of the loop, as well as the sine of the angle between the magnetic field and the normal to the loop.

The direction of the current in the loop, the area of the loop, the orientation of the loop, and the magnitude of the magnetic field all affect the angle between the magnetic field and the normal to the loop, but not the magnitude of the torque.

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(a) find the power of the lens necessary to correct an eye with a far point of 26.1 cm

Answers

The power of the lens necessary to correct an eye with a far point of 26.1 cm is approximately 3.83 diopters.

To find the power of the lens necessary to correct an eye with a far point of 26.1 cm, we can use the formula:

Power (P) = 1 / focal length (f)

The far point is the distance at which the eye can see clearly. In this case, it is 26.1 cm or 0.261 meters. To correct the vision, the lens should have a focal length equal to the far point.

Focal length (f) = 0.261 meters

Now, we can calculate the power:

P = 1 / 0.261
P ≈ 3.83 diopters

Therefore, a lens with a power of approximately 3.83 diopters is necessary to correct an eye with a far point of 26.1 cm.

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For high-pass shelving filters: if you run the frequency response high enough, it eventually rolls off. Give two possible sources of a low-pass pole.

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For high-pass shelving filter, if you run the frequency response high enough, it eventually rolls off due to the nature of the filter's design. This means that at very high frequencies, the filter will start to attenuate the signal, effectively acting as a low-pass filter.

Two possible sources of a low-pass pole in a high-pass shelving filter include the capacitor and the op-amp. Capacitors have a tendency to act as low-pass filters due to their inherent frequency-dependent impedance. Additionally, op-amps can introduce a low-pass pole into the circuit due to their finite gain bandwidth product and the effect of the feedback network on the circuit's frequency response.
 Two possible sources of a low-pass pole are:

1. Parasitic capacitance: Unintended capacitance that forms between components or traces on a circuit board can create a low-pass pole, as it causes the high-frequency signal to be attenuated.

2. Component limitations: The frequency response of active components like op-amps or transistors can limit the bandwidth of a filter. As the frequency increases, these components may not respond quickly enough, resulting in a low-pass pole.

These factors can cause the high-frequency response of a high-pass shelving filter to roll off.

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a diffraction grating has 2,160 lines per centimeter. at what angle in degrees will the first-order maximum be for 540 nm wavelength green light? (no response) seenkey 6.7 °

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The first-order maximum for 540 nm wavelength green light with a diffraction grating of 2,160 lines per centimeter will be at an angle of 6.7°.

To find the angle of the first-order maximum for a 540 nm wavelength green light with a diffraction grating having 2,160 lines per centimeter, we can use the grating equation,
nλ = d sinθ
where n is the order of maximum (n = 1 for first-order maximum), λ is the wavelength of light (540 nm), d is the distance between the lines (inverse of the number of lines per centimeter), and θ is the angle we want to find.

1. Convert lines per centimeter to distance between lines (d):
d = 1 / 2,160 lines/cm = 1 / (2,160 x 10^2 lines/m) = 1 / 2.16 x 10^5 lines/m
d = 4.63 x 10^-6 m

2. Convert the wavelength from nm to m:
λ = 540 nm = 540 x 10^-9 m

3. Use the grating equation to find the angle θ:
1(540 x 10^-9 m) = (4.63 x 10^-6 m) sinθ
sinθ = (540 x 10^-9 m) / (4.63 x 10^-6 m)

4. Calculate sinθ:
sinθ = 0.1166

5. Find the angle θ:
θ = arcsin(0.1166) = 6.7°

With a 2,160-line-per-centimeter diffraction grating, the first-order maximum for green light with a wavelength of 540 nm will be at an angle of 6.7°.

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a 1.0-ma current of 1.6-mev protons strikes a 2.6-mev-high potential barrier 2.8 x 10-13 m thick. estimate the transmitted current.

Answers

The estimated transmitted current is 0.10 mA.

What is Proton?

A proton is a subatomic particle found in the nucleus of an atom. It has a positive electric charge and its mass is approximately 1 atomic mass unit (amu). Protons are one of the building blocks of matter and determine the atomic number and chemical properties of an element.

The transmission probability of the protons through the barrier can be calculated using the formula:

[tex]T = e^{(-2kd)[/tex]

where T is the transmission probability, k is the wavevector of the protons, and d is the thickness of the barrier.

The wavevector of the protons can be calculated using the de Broglie relation:

λ = h/p

where λ is the de Broglie wavelength, h is the Planck constant, and p is the momentum of the protons.

Substituting the values given in the problem, we get:

λ = h/p = h/(mv) = (6.626 x 10⁻³⁴ J.s)/[(1.67 x 10⁻²⁷ kg)(1.6 x 10⁶ m/s)] ≈ 2.4 x 10⁻¹⁵ m

The wavevector is then:

k = 2π/λ = 2π/(2.4 x 10⁻¹⁵ m) ≈ 2.6 x 10¹⁵ m⁻¹

Substituting the values of k and d into the formula for transmission probability, we get:

[tex]T = e^{(-2kd)} = e^{[-2(2.6 x 10^{15} m^{-1})(2.8 x 10^{-13 m)]}[/tex] ≈ 0.10

Therefore, the transmitted current is:

[tex]I_{transmitted[/tex] = T x [tex]I_{incident[/tex] = (0.10)(1.0 mA) = 0.10 mA

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Suppose a 25 mH inductor has a reactance of 95 S2. What would the frequency be in Hz? Grade Summary 0% 100% sin0 cosO cotanO asin acosO atanOacotan) sinh0 cosh0tanhO cotanh0 Degrees Radians

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The  frequency in Hz, given the reactance and the inductor value would be approximately 605.11 Hz.

Reactance (X_L) = 2 * pi * frequency (f) * inductance (L)

In this case, the reactance (X_L) is 95 Ω and the inductance (L) is 25 mH (0.025 H). We can rearrange the formula to solve for the frequency (f):

Frequency (f) = Reactance (X_L) / (2 * pi * inductance (L))

Now, plug in the given values:

Frequency (f) = 95 Ω / (2 * pi * 0.025 H)

Calculate the result:

Frequency (f) ≈ 605.11 Hz

So, the frequency would be approximately 605.11 Hz.

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Consider an asteroid with a radius of 17 km and a mass of 3.1×1015 kg . Assume the asteroid is roughly spherical. Suppose the asteroid spins about an axis through its center, like the Earth, with a rotational period T. What is the smallest value T can have before loose rocks on the asteroid's equator begin to fly off the surface?
ga is 7.4*10^-4

Answers

The smallest value of T for which loose rocks on the equator of the asteroid begin to fly off its surface is about 13.6 hours.

How can we determine the minimum value of T for which loose rocks on the equator of the asteroid begin to fly off its surface?

To solve this problem, we need to find the centrifugal force acting on a rock located on the equator of the asteroid due to its rotation. If the centrifugal force is greater than the gravitational force holding the rock on the asteroid's surface, the rock will fly off the surface.

The centrifugal force is given by:

F = mω²r

where m is the mass of the rock, ω is the angular velocity (i.e., 2π/T), and r is the distance from the rock to the axis of rotation. We want to find the minimum value of T for which the centrifugal force exceeds the gravitational force.

The gravitational force holding the rock on the surface is given by:

Fg = GmM/R²

where G is the gravitational constant, M is the mass of the asteroid, and R is its radius. We can assume that R is much larger than the radius of the rock, so we can use R as the distance from the rock to the center of the asteroid.

Setting F = Fg, we have:

mω²r = GmM/R²

Simplifying, we get:

ω²r = GM/R³

Solving for T, we get:

T = 2π√(R³/GM)

Substituting the given values, we get:

T = 2π√((17 km)³/(6.67×10^-11 Nm²/kg² × 3.1×10^15 kg))

T ≈ 13.6 hours

Therefore, the smallest value of T for which loose rocks on the equator of the asteroid begin to fly off its surface is about 13.6 hours.

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The smallest value of T for which loose rocks on the equator of the asteroid begin to fly off its surface is about 13.6 hours.

How can we determine the minimum value of T for which loose rocks on the equator of the asteroid begin to fly off its surface?

To solve this problem, we need to find the centrifugal force acting on a rock located on the equator of the asteroid due to its rotation. If the centrifugal force is greater than the gravitational force holding the rock on the asteroid's surface, the rock will fly off the surface.

The centrifugal force is given by:

F = mω²r

where m is the mass of the rock, ω is the angular velocity (i.e., 2π/T), and r is the distance from the rock to the axis of rotation. We want to find the minimum value of T for which the centrifugal force exceeds the gravitational force.

The gravitational force holding the rock on the surface is given by:

Fg = GmM/R²

where G is the gravitational constant, M is the mass of the asteroid, and R is its radius. We can assume that R is much larger than the radius of the rock, so we can use R as the distance from the rock to the center of the asteroid.

Setting F = Fg, we have:

mω²r = GmM/R²

Simplifying, we get:

ω²r = GM/R³

Solving for T, we get:

T = 2π√(R³/GM)

Substituting the given values, we get:

T = 2π√((17 km)³/(6.67×10^-11 Nm²/kg² × 3.1×10^15 kg))

T ≈ 13.6 hours

Therefore, the smallest value of T for which loose rocks on the equator of the asteroid begin to fly off its surface is about 13.6 hours.

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A sump pump is draining a flooded basement at the rate of 0.600 L/s, with an output pressure of 3.00 ? 105 N/m2. Neglect frictional losses in both parts of this problem.
(a) The water enters a hose with a 3.00 cm inside diameter and rises 2.50 m above the pump. What is its pressure at this point?
_____N/m2
(b) The hose then loses 1.80 m in height from this point as it goes over the foundation wall, and widens to 4.00 cm diameter. What is the pressure now?
_____N/m2

Answers

a. The pressure of the water that enters a hose with a 3.00 cm inside diameter and rises 2.50 m above the pump is 276,475 N/m².

b. The pressure after losing 1.80 m in height and widening to 4.00 cm diameter is 293,715 N/m².

To find the pressure of the water 2.50 m above the pump, we need to account for the change in potential energy. The pressure at this point can be calculated using the following formula:

P2 = P1 - ρgh

where P1 is the initial pressure (3.00 × 10^5 N/m²), ρ is the density of water (approximately 1000 kg/m³), g is the acceleration due to gravity (9.81 m/s²), and h is the height difference (2.50 m).

P2 = 3.00 × 10⁵ N/m₂ - (1000 kg/m³)(9.81 m/s²)(2.50 m)

P2 ≈ 276,475 N/m²

The pressure of the water 2.50 m above the pump is approximately 276,475 N/m².

To find the pressure after losing 1.80 m in height and widening to 4.00 cm diameter, we can use the same formula, adjusting the height difference accordingly:

P3 = P2 + ρgh'

where h' is the new height difference (1.80 m).

P3 = 276,475 N/m² + (1000 kg/m³)(9.81 m/s²)(1.80 m)

P3 ≈ 293,715 N/m²

The pressure after losing 1.80 m in height and widening to 4.00 cm diameter is approximately 293,715 N/m².

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the magnetic field 41.0 cm away from a long, straight wire carrying current 6.00 a is 2930 nt. (a) at what distance is it 293 nt?

Answers

At a distance of 410 cm from the wire, the magnetic field is 293 nT, Straight wire carrying current 6.00 a is 2930 nt.

To answer this question, we will use the formula for the magnetic field B around a straight wire carrying current I:
B = (μ₀ * I) / (2 * π * d)
where μ₀ is the permeability of free space (4π × 10⁻⁷ T·m/A), I is the current, and d is the distance from the wire.
Given the initial magnetic field B₁ = 2930 nT, the current I = 6.00 A, and distance d₁ = 41.0 cm, we can calculate the distance d₂ where the magnetic field is B₂ = 293 nT.
We first find the ratio of the magnetic fields:
B₁ / B₂ = 2930 nT / 293 nT = 10
Since the magnetic field is inversely proportional to the distance, the ratio of distances is:
d₂ / d₁ = 10
Now, we can solve for d₂:
d₂ = 10 * d₁ = 10 * 41.0 cm = 410 cm

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Avechile is being planed that is driven by a fly wheel engine it has to run for at least 30minute and develop teacly power of 500w
How much Energy will fly wheel need to supply?

Answers



The amount of energy that the fly wheel needs to supply depends on the efficiency of the engine and the amount of time it runs for, as well as the power output required. In this case, the engine must run for 30 minutes and develop a maximum power output of 500W.

The energy required is calculated using the equation Power x Time = Energy. This means that the flywheel needs to supply 500W multiplied by the 30 minute run time, equalling 15,000 Watt-minutes. This can also be written as 15kWh.

as an admirer of thomas young, you perform a double-slit experiment in his honor. you set your slits 1.03 mm apart and position your screen 3.93 m from the slits. although young had to struggle to achieve a monochromatic light beam of sufficient intensity, you simply turn on a laser with a wavelength of 631 nm . how far on the screen are the first bright fringe and the second dark fringe from the central bright fringe? express your answers in millimeters.

Answers

The second dark fringe is approximately 4.85 mm from the central bright fringe. We can use the formula d(sinθ) = mλ to calculate the position of the bright and dark fringes. First, we need to calculate the distance between the slits and the screen in meters:

3.93 m

Next, we need to calculate the distance between the slits:

1.03 mm = 0.00103 m

We can use this distance as the distance between the two sources (the two slits).

The wavelength of the laser is given as:

631 nm = 0.000631 m

We will use this value for λ.

Now we can calculate the angle θ for the first bright fringe:

m = 1 (since we're looking for the first bright fringe)

d = 0.00103 m

λ = 0.000631 m

θ = sin⁻¹(mλ/d)

θ = sin⁻¹(0.000631/0.00103)

θ ≈ 0.617 radians

To find the position of the first bright fringe on the screen, we multiply θ by the distance between the slits and the screen:

x = θd

x = 0.617 x 3.93

x ≈ 2.43 mm

So the first bright fringe is approximately 2.43 mm from the central bright fringe.

To find the position of the second dark fringe, we use the same formula but with m = 2:

θ = sin⁻¹(2λ/d)

θ ≈ 1.235 radians

x = θd

x = 1.235 x 3.93

x ≈ 4.85 mm

So the second dark fringe is approximately 4.85 mm from the central bright fringe.

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a wire 2.22 m long carries a current of 10.7 a and makes an angle of 40.4° with a uniform magnetic field of magnitude b = 1.99 t. calculate the magnetic force on the wire.

Answers

Answer:

47.86 N

Explanation:

The magnetic force on a current-carrying wire in a magnetic field is given by the formula:

F = BIL sinθ

where F is the magnetic force, B is the magnetic field, I is the current, L is the length of the wire, and θ is the angle between the wire and the magnetic field.

Substituting the given values, we get:

F = (1.99 T) x (10.7 A) x (2.22 m) x sin(40.4°)

F = 47.86 N

Therefore, the magnetic force on the wire is 47.86 N, in the direction perpendicular to both the magnetic field and the wire.

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Consider an absorbing. continuous-time Markov chain with possibly more than one absorbing states. (a) Argue that the continuous-time chain is absorbed in state a if and only if the embedded discrete-time chain is absorbed in state a. (b) Let 1 2 3 4 5 1(0 0 0 0 0 2 1 -3 2 0 0 2-3 0 2 4 20 4 0 0 2 -5 3 50 0 0 0 0 be the generator matrix for a continuous-time Markov chain. For the chain started in state 2, find the probability that the chain is absorbed in state 5

Answers

A). The continuous-time chain is absorbed in state an if and only if the embedded discrete-time chain is absorbed in state a.

(b) The probability that the chain is absorbed in state 5, given that it started in state 2, is 20/3.

[tex]N = (I-Q)^{-1},[/tex]

Q = 1 -3 2 0 0

2 -3 0 2 0

0 0 0 0 0

0 0 0 0 0

R = 2 0 0

0 4 2

0 0 50

I = 1 0 0 0 0

0 1 0 0 0

0 0 1 0 0

0 0 0 1 0

0 0 0 0 1

Therefore, the fundamental matrix N is given by:

[tex]N = (I-Q)^{-1},[/tex]= 1.25 0.75 -0.5 0 0

2.5 3.5 -1.5 -2 0

0 0 1 0 0

0 0 0 1 0

0 0 0 0 1

A continuous-time chain is a mathematical model used to describe the behavior of a system that changes over time. It is a stochastic process that consists of a sequence of random variables, where each variable represents the state of the system at a specific time. The chain evolves in continuous time, meaning that the state of the system can change at any point in time, not just at discrete time intervals.

Continuous-time chains are used in many fields, including physics, biology, finance, and engineering, to model a wide range of phenomena such as the movement of particles in a fluid, the spread of disease in a population, or the behavior of financial markets. The behavior of a continuous-time chain can be analyzed using techniques from probability theory and stochastic processes, such as Markov chains, differential equations, and stochastic calculus.

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two long, parallel wires are separated by 4.45 cm and carry currents of 1.73 a and 3.57 a , respectively. find the magnitude of the magnetic force that acts on a 2.13 m length of either wire.

Answers

The magnitude of the magnetic force that acts on a 2.13 m length of two long, parallel wires are separated by 4.45 cm and carry currents of 1.73 A and 3.57 A, respectively is 3.64 × 10⁻⁴ N.

To calculate the magnetic force acting on either wire, we can use the formula:

F = (μ₀ × I₁ × I₂ × L) / (2 × π × d)

Where F is the magnetic force, μ₀ is the permeability of free space (4π × 10⁻⁷ T·m/A), I₁ and I₂ are the currents in the wires, L is the length of the wire, and d is the distance between the wires.

Plugging in the given values, we have:

F = (4π × 10⁻⁷ T·m/A × 1.73 A × 3.57 A × 2.13 m) / (2 × π × 0.0445 m)

Calculating the magnetic force, we get:

F ≈ 3.64 × 10⁻⁴ N

So, the magnitude of the magnetic force that acts on a 2.13 m length of either wire is approximately 3.64 × 10⁻⁴ N.

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introduction and conclusion on determining the geometric method of adding vectors using parallelogram method​

Answers

Introduction:

In physics and mathematics, vectors are quantities that have both magnitude and direction. Adding vectors is an essential operation in vector algebra, and there are different methods to achieve it. One of the most popular ways of adding vectors is the parallelogram method, which involves constructing a parallelogram using the vectors as adjacent sides and then finding the diagonal of the parallelogram.

Body:

The parallelogram method is a geometric method of adding vectors. It works on the principle that if two vectors are represented by adjacent sides of a parallelogram, then their sum is represented by the diagonal of the parallelogram. To use this method, draw two vectors as adjacent sides of a parallelogram, and then draw the diagonal from the initial point of the two vectors to the opposite corner of the parallelogram. The length and direction of the diagonal represent the magnitude and direction of the sum of the two vectors, respectively.

Conclusion:

The parallelogram method is an intuitive and straightforward way of adding vectors. It is particularly useful when dealing with two-dimensional vectors as it requires only basic geometric knowledge. However, it is not the most efficient method, especially when dealing with many vectors in three dimensions. Other methods, such as the component method, may be more appropriate in such cases. Nonetheless, the parallelogram method remains an essential tool in the study of vectors and provides a useful visualization of vector addition.

What are vectors?

In mathematics and physics, a vector is a mathematical object that has both magnitude and direction. Geometrically, a vector can be represented as an arrow with a specified length and direction. Vectors are used to represent quantities that have both size and direction, such as velocity, force, and displacement.

They can be added, subtracted, and multiplied by scalar quantities (e.g., numbers) to produce new vectors that represent the resulting magnitude and direction. Vectors play a fundamental role in many areas of mathematics and physics, including calculus, linear algebra, mechanics, and electromagnetism, among others.

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A 70 kg person can achieve the maximum speed of 2.5 m/s while running a 100 m dash. Treat the person as a point particle.
a. At this speed, what is the person's kinetic energy?
Express your answer with the appropriate units.
b. To what height above the ground would the person have to climb in a tree to increase his gravitational potential energy by an amount equal to the kinetic energy you calculated in part A?

Answers

Answer:

a. 218.75 J b. 0.3125m

Explanation:

A:

Kinetic energy is found using the formula [tex]KE = \frac{1}{2}*m*v^2[/tex]

Plugging in 2.5 m/s for velocity and 70 kg for mass we get 218.75 J

B:

To find the height the person has to reach for his kinetic energy to be equal to his potential energy you use the equation [tex]PE = m*g*h[/tex] and set the kinetic energy equation equal to the potential energy equations, in which you will get:

[tex]\frac{1}{2}*m*v^2=m*g*h\\ \frac{1}{2}*v^2=g*h\\ h=\frac{v^2}{2g}[/tex]

h = 0.3125 meters

Answer:

a. 218.75 J b. 0.3125m

Explanation:

A:

Kinetic energy is found using the formula [tex]KE = \frac{1}{2}*m*v^2[/tex]

Plugging in 2.5 m/s for velocity and 70 kg for mass we get 218.75 J

B:

To find the height the person has to reach for his kinetic energy to be equal to his potential energy you use the equation [tex]PE = m*g*h[/tex] and set the kinetic energy equation equal to the potential energy equations, in which you will get:

[tex]\frac{1}{2}*m*v^2=m*g*h\\ \frac{1}{2}*v^2=g*h\\ h=\frac{v^2}{2g}[/tex]

h = 0.3125 meters

find the index of refraction in a medium in which the speed of light is 2.00 108 m/s.

Answers

The index of refraction in a medium is 1.50 in which the speed of light is 2.00 [tex]10^8[/tex] m/s.

The index of refraction of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium. Therefore, if the speed of light in a medium is 2.00 × [tex]10^8[/tex] m/s, we can find the index of refraction by dividing the speed of light in a vacuum (which is approximately 3.00 ×  [tex]10^8[/tex]m/s) by the speed of light in the medium:

Index of refraction = speed of light in vacuum / speed of light in medium
Index of refraction = 3.00 ×  [tex]10^8[/tex]m/s / 2.00 ×  [tex]10^8[/tex]m/s
Index of refraction = 1.50

Therefore, The index of refraction in a medium is 1.50.

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The index of refraction in a medium is 1.50 in which the speed of light is 2.00 [tex]10^8[/tex] m/s.

The index of refraction of a medium is defined as the ratio of the speed of light in a vacuum to the speed of light in that medium. Therefore, if the speed of light in a medium is 2.00 × [tex]10^8[/tex] m/s, we can find the index of refraction by dividing the speed of light in a vacuum (which is approximately 3.00 ×  [tex]10^8[/tex]m/s) by the speed of light in the medium:

Index of refraction = speed of light in vacuum / speed of light in medium
Index of refraction = 3.00 ×  [tex]10^8[/tex]m/s / 2.00 ×  [tex]10^8[/tex]m/s
Index of refraction = 1.50

Therefore, The index of refraction in a medium is 1.50.

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What is the average power loss in crab nebula?

Answers

The average power loss in the Crab Nebula is estimated to be around 4.6 × 10^38 erg/s, which is equivalent to about 2.2 million times the power output of the sun.

What's Crab Nebula

The Crab Nebula is a supernova remnant that emits radiation across the electromagnetic spectrum. The energy of this radiation is thought to come from the rotational energy of the pulsar at its center.

The power loss is due to the emission of radiation in the form of synchrotron radiation and inverse Compton scattering. These processes are responsible for producing the high-energy gamma-ray emission observed from the Crab Nebula.

Understanding the energy output of the Crab Nebula is important for studying the processes that occur in supernova remnants and for understanding the behavior of pulsars.

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A rod suspended at its end acts as a physical pendulum and swings with a period of 1. 4 s. What is the length of this physical pendulum? Assume that g=9.8 m/s2

Answers

The length of this physical pendulum is [tex]1.207\ meters.[/tex] A rod suspended at its end acts as a physical pendulum and swings with a period of [tex]1. 4 s[/tex]

The formula for the period of a physical pendulum is:

[tex]T = 2\pi * \sqrt{L / g}[/tex]

The time period of a pendulum is the time it takes for one complete oscillation or swing. It is the time taken for the pendulum to return to its original starting position after being displaced and released.

where:

T = period of the pendulum,

L = length of the pendulum,

g = acceleration due to gravity,

Now, rearranging the formula to solve for L:

[tex]L = (g / (4\pi^2)) * T^2\\L = (9.8 / (4 * 3.14²)) * (1.4 )^2\\L = (9.8 / 39.478) * 1.96\\L = 1.207\ meters[/tex]

So, the length of this physical pendulum is [tex]1.207\ meters.[/tex]

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ULF (ultra low frequency) electromagnetic waves, produced in the depths of outer space, have been observed with wavelengths in excess of 29 million kilometers.
Part A
What is the period of such a wave?

Answers

According to the question the period of the ULF wave is 10 seconds.

What is period?

Period is the term used to describe the monthly cycle of a woman's reproductive system. During each menstrual cycle, a woman's body prepares for pregnancy. The egg is released from the ovary and travels through the Fallopian tubes to the uterus.

We can calculate the period of an ULF wave with the following formula:
Period (T) = 1/Frequency (f)
Since we don't know the exact frequency of the ULF wave, we can calculate an approximate period by using the wavelength (λ) of the wave, which is given as 29 million kilometers. Using the following formula, we can calculate the frequency of the wave:
Frequency (f) = Speed of light (c) / Wavelength (λ)
Substituting the values, we get:
f = 3 x 10⁸ m/s / 29 x 10⁶ km
f = 0.1 Hz
Now, we can calculate the period of the ULF wave using the formula:
T = 1/f
T = 1/0.1
T = 10 s
Therefore, the period of the ULF wave is 10 seconds.

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According to the question the period of the ULF wave is 10 seconds.

What is period?

Period is the term used to describe the monthly cycle of a woman's reproductive system. During each menstrual cycle, a woman's body prepares for pregnancy. The egg is released from the ovary and travels through the Fallopian tubes to the uterus.

We can calculate the period of an ULF wave with the following formula:
Period (T) = 1/Frequency (f)
Since we don't know the exact frequency of the ULF wave, we can calculate an approximate period by using the wavelength (λ) of the wave, which is given as 29 million kilometers. Using the following formula, we can calculate the frequency of the wave:
Frequency (f) = Speed of light (c) / Wavelength (λ)
Substituting the values, we get:
f = 3 x 10⁸ m/s / 29 x 10⁶ km
f = 0.1 Hz
Now, we can calculate the period of the ULF wave using the formula:
T = 1/f
T = 1/0.1
T = 10 s
Therefore, the period of the ULF wave is 10 seconds.

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n moles of an ideal diatomic gas with internal energy E = =nRT are taken through the cyclic process shown on the P-V diagram where P1=2P3 and V2=2V3. V2 a) What are the values of work W, change in internal energy AEint, and heat transfer Q in process 1-2? Express your answers in terms of P3 and V3. b) What are the values of work W, change in internal energy AEint, and heat transfer Q in process 2-3? Express your answers in terms of P3 and V3. c) What are the values of work W, change in internal energy AEint, and heat transfer Q in process 3-1? Express your answers in terms of P3 and V3. d) Calculate the efficiency of the cycle.

Answers

a. Therefore, we have: ΔEint = 2P3(V1 - 2V3).

b. Q = ΔEint = (4/5)nCv(T2 - T3) = (4/5)nR(T2 - T3).

c. Therefore, we have: ΔT = T1 - T3 = (P1V1 - P3V3)/nR = (2P3V1 - P3V3)/nR = P3(V1 - V3)/nR and Q = ΔEint + W = nCv(T1 - T3) + 2P3(V1 - V3)

d. In step two of the process, the diatomic gas expands isobarically from volume V1 to volume V2, then cools isochronally from V2 to V3.

a. The work done in process 1-2 is given by:

W = P1(V2 - V1)

Since P1 = 2P3 and V2 = 2V3, we have:

W = 2P3(2V3 - V1)

The change in internal energy in process 1-2 is given by:

ΔEint = Q - W

Q = P1(V2 - V1) = 2P3(2V3 - V1)

b) In process 2-3, the gas is undergoing an isochoric heating from volume V3 to volume V2, followed by an isobaric compression from volume V2 to volume V1.

The work done in process 2-3 is zero since the volume is constant.

The change in internal energy in process 2-3 is given by:

ΔEint = Q - W

Since the process is isochoric, the heat transfer Q is given by:

Q = ΔEint = nCvΔT = nCv(T2 - T3)

PV = nRT

For a diatomic gas, we have:

Cv = (5/2)R/2 = (5/4)R

Substituting for P and V, we have:

Cv(T2 - T3) = (5/4)nR(T2 - T3) = (5/4)ΔEint

Therefore, we have:

Q = ΔEint = (4/5)nCv(T2 - T3) = (4/5)nR(T2 - T3)

c) In process 3-1, the gas is undergoing an isobaric compression from volume V3 to volume V1, followed by an isochoric heating from volume V1 to volume V2.

The work done in process 3-1 is given by:

W = P1(V1 - V3) = 2P3(V1 - V3)

The change in internal energy in process 3-1 is given by:

ΔEint = Q - W

Process is isochoric, the heat transfer Q is given by:

Q = ΔEint = nCvΔT = nCv(T1 - T3)

ΔT = T1 - T3

From the ideal gas law, we have:

PV = nRT

Substituting for P and V, we have:

T = PV/nR

Therefore, we have:

ΔT = T1 - T3 = (P1V1 - P3V3)/nR = (2P3V1 - P3V3)/nR = P3(V1 - V3)/nR

Q = ΔEint + W = nCv(T1 - T3) + 2P3(V1 - V3)

d) The efficiency of the cycle is given by:

η = (Wnet / QH) x 100%

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A 10 kg sack slides down a smooth surface. If the normal force on the surface at the flat spot, A is 98.1 N (↑↑), the radius of the curvature is _____.a. 0.2 mb. 0.4 mc. 1.0 md. None of the above.

Answers

The radius of the curvature is 1.0 m (option c)  If the normal force on the surface at the flat spot, A is 98.1 N (↑↑) .

To calculate the radius of curvature using this formula:
radius of curvature (r) = (mass × acceleration due to gravity) / normal force

Step 1: Identify the mass (m), acceleration due to gravity (g), and normal force (N).
mass (m) = 10 kg
acceleration due to gravity (g) = 9.81 m/s²
normal force (N) = 98.1 N

Step 2: Plug in the values into the formula.
radius of curvature (r) = (10 kg × 9.81 m/s²) / 98.1 N

Step 3: Perform the calculations.
radius of curvature (r) = (98.1 kg m/s²) / 98.1 N

Step 4: Simplify the result.
radius of curvature (r) = 1 m

So, the radius of the curvature is 1.0 m .Hence, option c is correct.

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A box having a mass of 1.5 kg is accelerated across a table at 1.5 m/s2. The coefficient of friction on the box is 0.3. What is the force being applied to the box? If this force were applied by a spring, what would the spring constant have to be in order for the spring to be stretched to only 0.08 m while pulling the box?

Answers

To determine the force being applied to the box, we can use Newton's second law of motion:

Force = mass x acceleration

Plugging in the given values, we get:

Force = 1.5 kg x 1.5 m/s²

Force = 2.25 N

Therefore, the force being applied to the box is 2.25 N.

To find the spring constant required to stretch the spring only 0.08 m while pulling the box, we can use Hooke's law:

Force = spring constant x displacement

Plugging in the given values, we get:

2.25 N = k * 0.08 m

Solving for the spring constant, we get:

k = 2.25 N / 0.08 m

k = 28.125 N/m

Therefore, the spring constant would have to be 28.125 N/m in order for the spring to be stretched to only 0.08 m while pulling the box with a force of 2.25 N.

A 26.5 kΩ resistor connected to an AC voltage source dissipates an average power of 0.800 W. HINT (a) Calculate the rms current in the resistor (in A). (b) Calculate the rms voltage of AC source (in V).

Answers

(a) The rms current in the resistor is 6.11 mA.

(b) The rms voltage of the AC source is 161.8 V.

To find the rms current (I) in the resistor, we use the formula P = I²R, where P is the average power (0.800 W) and R is the resistance (26.5 kΩ).

Step 1: Rearrange the formula to solve for I: I = √(P/R)
Step 2: Convert the resistance to ohms: 26.5 kΩ = 26500 Ω
Step 3: Plug the values into the formula: I = √(0.800 W / 26500 Ω) = 6.11 x 10⁻³ A, or 6.11 mA.

To find the rms voltage (V) of the AC source, we use the formula V = IR.

Step 4: Plug the values into the formula: V = (6.11 x 10⁻³ A) x (26500 Ω) = 161.8 V.

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For a velocity field given by the equation, V = x2yi - y2xj + xyk, determine whether or not this flow field is incompressible. Determine an expression for the vorticity of the flow field described by: V = -xy3i + y4j Is the flow irrotational or rotational? Explain.

Answers

The flow is rotational because the curl of the velocity field is nonzero, which implies that there is rotation in the flow. The fact that the vorticity is not zero confirms this.

The divergence of a Gradient vector field V is given by: div(V) = ∂Vx/∂x + ∂Vy/∂y + ∂Vz/∂z.

In this case, the velocity field is given by V = x² y i - y² x j + xy k.

Calculating the divergence:

div(V) = ∂(x² y)/∂x + ∂(-y² x)/∂y + ∂(xy)/∂z

= 2xy - 2yx + 0

= 0

curl(V) = (∂Vz/∂y - ∂Vy/∂z) i + (∂Vx/∂z - ∂Vz/∂x) j + (∂Vy/∂x - ∂x/∂y) k

In this case, Vx = -xy³, Vy = [tex]y^4[/tex], and Vz = 0, so:

curl(V) = (-3y² i - x j) + 0k

The vorticity is the magnitude of the curl, so:

|curl(V)| = √((-3y²)² + x²)

A gradient refers to the rate of change in a variable, typically represented as a slope or derivative. In mathematics, a gradient is a vector that indicates both the direction and magnitude of the greatest rate of change in a function. It is calculated by taking the partial derivatives of the function with respect to each variable and then combining them into a vector.

Gradients are used in a wide range of applications, including optimization problems, computer graphics, and machine learning. In optimization, the gradient is used to find the minimum or maximum value of a function by iteratively adjusting the input variables in the direction of steepest descent or ascent. In computer graphics, gradients are used to create smooth transitions between colors or shades of an image.

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In an integrated circuit, the current density in a2.2-μm-thick × 80-μm-wide gold film is 7.9×105 A/m2 .How much charge flows through the film in 15 min?

Answers

The 125.1 coulombs of charge flow through the gold film in 15 minutes.

We can use the equation for current density (J) to find the current (I) flowing through the gold film:

J = I/A

where A is the cross-sectional area of the gold film, given by:

A = t x w

Substituting the given values, we get:

[tex]A = (2.2 \times 10^{-6} m) \times (80 \times 10^{-6} m) = 1.76 \times 10^{-7} m^2I = J \times A = (7.9 \times 10^5 A/m^2) \times (1.76 \times 10^{-7} m^2) = 0.139 AQ = I \times t[/tex]

Substituting the given values, we get:

Q = (0.139 A) x (15 x 60 s) = 125.1 C

Coulombs is named after the French physicist Charles-Augustin de Coulomb who discovered Coulomb's law, which describes the electrostatic interaction between electrically charged particles. Coulombs are used to measure the amount of electric charge in a system, such as in a capacitor or in an electric current.

The Coulomb is an essential unit of measurement in fields such as electrical engineering, physics, and electronics. It is used to quantify the amount of charge that is involved in a wide range of electrical phenomena, including the attraction or repulsion of charged particles, the flow of electricity through a conductor, and the charging of a battery or capacitor.

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design a series rlc type bandpass filter with cutoff frequencies of 10 khz and 12 khz. assuming c = 80 pf, find r, l, and q.

Answers

To design a series RLC bandpass filter with cutoff frequencies of 10 kHz and 12 kHz, and C = 80 pF, you need to find R, L, and Q. The values for R, L, and Q are approximately 31.83 ohms, 25.13 μH, and 11.90, respectively.

To determine these values, follow these steps:

1. Calculate the center frequency (f0) and bandwidth (BW) using the given cutoff frequencies:
  f0 = (10 kHz + 12 kHz) / 2 = 11 kHz
  BW = 12 kHz - 10 kHz = 2 kHz

2. Calculate the filter's quality factor (Q):
  Q = f0 / BW = 11 kHz / 2 kHz = 5.5

3. Calculate the inductor value (L) using the center frequency and capacitance:
  L = 1 / (4 * π² * f0² * C) ≈ 25.13 μH
  where C = 80 pF = 80 * 10⁻¹² F

4. Calculate the resistance (R) using the quality factor, inductor, and center frequency:
  R = 2 * π * f0 * L / Q ≈ 31.83 ohms

With these values, you can design a series RLC bandpass filter with the desired characteristics.

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How many photons per second enter one eye if you look directly at a 100 W light bulb 2.00 m away? Assume a pupil diameter of 4.00 mm and a wavelength of 600 nm. How many photons per second enter your eye if a 1.00 m W laser beam is directed into your eye? λ=633nm)

Answers

The number of photons per second that enter the eye can be calculated using the formula:

N = (P / A) x (t / h) x (1 / E)

where:

P = power of the light source (in watts)

A = area of the pupil (in square meters)

t = transmission coefficient of the cornea and lens (assumed to be 0.95)

h = Planck's constant (6.626 x 10[tex]^-34[/tex] joule-seconds)

E = energy per photon (in joules)

For the 100 W light bulb:

P = 100 W

A = π (0.002 m)^2 = 1.2566 x 10[tex]^-5 m^2[/tex] (assuming the pupil is circular)

t = 0.95 (given)

h = 6.626 x 10[tex]^-34[/tex] J·s (given)

λ = 600 nm = 6.00 x 10[tex]^-7 m[/tex] (given)

c = speed of light = 3.00 x 10m/s (assumed)

E = hc / λ = (6.626 x 10[tex]^-34[/tex] J·s) x (3.0[tex]^8[/tex]0 x 10[tex]^8[/tex] m/s) / (6.00 x 10[tex]^-7 m[/tex]) = 3.31 x 10[tex]^-19[/tex] J

Plugging in the values:

N = (100 W / 1.2566 x 10[tex]^-5 m^2[/tex]) x (0.95) x (1 s / 6.626 x 10[tex]^-34[/tex] J·s) x (1 / 3.31 x 10[tex]^-19[/tex] J)

= 7.70 x 10^16 photons/s

Therefore, about 7.70 x 10[tex]^16[/tex]  photons per second enter one eye when looking directly at a 100 W light bulb from a distance of 2.00 m.

For the 1.00 mW laser beam:

P = 1.00 x 10[tex]^-3[/tex] W

A = π (0.002 m[tex])^2[/tex] = 1.2566 x 10[tex]^-5 m^2[/tex] (assuming the pupil is circular)

t = 0.95 (given)

h = 6.626 x 10[tex]^-34[/tex]J·s (given)

λ = 633 nm = 6.33 x 10[tex]^-7[/tex] m (given)

c = speed of light = 3.00 x 10[tex]^8[/tex] m/s (assumed)

E = hc / λ = (6.626 x 10[tex]^-34[/tex] J·s) x (3.00 x 10[tex]^8[/tex]m/s) / (6.33 x 10[tex]^-7[/tex]m) = 3.14 x 10[tex]^-19[/tex] J

Plugging in the values:

N = (1.00 x 10[tex]^-3[/tex]W / 1.2566 x 10[tex]^-5 m^2[/tex]) x (0.95) x (1 s / 6.626 x 10[tex]^-34[/tex] J·s) x (1 / 3.14 x 10[tex]^-19[/tex]J)

= 7.17 x 10^[tex]12[/tex] photons/s

Therefore, about 7.17 x 10[tex]^12[/tex] photons per second enter your eye if a 1.00 mW laser beam with a wavelength of 633 nm is directed into your eye.

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The number of photons per second that enter the eye can be calculated using the formula:

N = (P / A) x (t / h) x (1 / E)

where:

P = power of the light source (in watts)

A = area of the pupil (in square meters)

t = transmission coefficient of the cornea and lens (assumed to be 0.95)

h = Planck's constant (6.626 x 10[tex]^-34[/tex] joule-seconds)

E = energy per photon (in joules)

For the 100 W light bulb:

P = 100 W

A = π (0.002 m)^2 = 1.2566 x 10[tex]^-5 m^2[/tex] (assuming the pupil is circular)

t = 0.95 (given)

h = 6.626 x 10[tex]^-34[/tex] J·s (given)

λ = 600 nm = 6.00 x 10[tex]^-7 m[/tex] (given)

c = speed of light = 3.00 x 10m/s (assumed)

E = hc / λ = (6.626 x 10[tex]^-34[/tex] J·s) x (3.0[tex]^8[/tex]0 x 10[tex]^8[/tex] m/s) / (6.00 x 10[tex]^-7 m[/tex]) = 3.31 x 10[tex]^-19[/tex] J

Plugging in the values:

N = (100 W / 1.2566 x 10[tex]^-5 m^2[/tex]) x (0.95) x (1 s / 6.626 x 10[tex]^-34[/tex] J·s) x (1 / 3.31 x 10[tex]^-19[/tex] J)

= 7.70 x 10^16 photons/s

Therefore, about 7.70 x 10[tex]^16[/tex]  photons per second enter one eye when looking directly at a 100 W light bulb from a distance of 2.00 m.

For the 1.00 mW laser beam:

P = 1.00 x 10[tex]^-3[/tex] W

A = π (0.002 m[tex])^2[/tex] = 1.2566 x 10[tex]^-5 m^2[/tex] (assuming the pupil is circular)

t = 0.95 (given)

h = 6.626 x 10[tex]^-34[/tex]J·s (given)

λ = 633 nm = 6.33 x 10[tex]^-7[/tex] m (given)

c = speed of light = 3.00 x 10[tex]^8[/tex] m/s (assumed)

E = hc / λ = (6.626 x 10[tex]^-34[/tex] J·s) x (3.00 x 10[tex]^8[/tex]m/s) / (6.33 x 10[tex]^-7[/tex]m) = 3.14 x 10[tex]^-19[/tex] J

Plugging in the values:

N = (1.00 x 10[tex]^-3[/tex]W / 1.2566 x 10[tex]^-5 m^2[/tex]) x (0.95) x (1 s / 6.626 x 10[tex]^-34[/tex] J·s) x (1 / 3.14 x 10[tex]^-19[/tex]J)

= 7.17 x 10^[tex]12[/tex] photons/s

Therefore, about 7.17 x 10[tex]^12[/tex] photons per second enter your eye if a 1.00 mW laser beam with a wavelength of 633 nm is directed into your eye.

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Each question under Evidence corresponds to the same question under Influences (eg. A Question 3 under Descriptive Evidence 1 corresponds to Question 3 under Underlying Influences 1), The goal of this exercise is to help you reflect and analyze the case material outside of class. Answering the following questions will enhance your understanding of some of the key issues of the case, as well as your participation in class discussions related to it Read the complete case on Airbnb and then answer the questions that followUnderlying Influences 1 What aspect of the PESTEL framework had an impact on Airbnb's attractiveness to investors in 2010?A. global financial crisis B. popularity of Uber C. decline of sharing economy D. laws against short-term rentals E. economic boom Identify a turning point associated with the historical developments related to both documents AND explain why the historical developments associated with these documents are considered a turning point. (Second picture posted) Complete the square to re-write the quadratic function in vertex form Escoge el verbo. La chica del coro ___ muy bienDibujanBailanCantan Using only the periodic table, arrange the following elements in order of increasing ionization energy:arsenic, selenium, potassium, gallium Find the length of the missing side How can you show sensitivity when communicating with patients about 3rd party (insurance) requirements- you can formulate your response around how you can discuss the requirement for collecting patient copay/coinsurance/deductible at the time of service In a microrayon, as developed during the Soviet period, in what kind of residential units did people live?garden apartmentshighrise apartment buildingssingle family homes and duplexesterrace housing what is 3(2/5) Witten in as column vector Study Islandfrom Chapter 1 in The Call of the Wildby Jack London He was glad for one thing: the rope was off his neck. That had given them an unfair advantage; but now that it was off, he would show them. They would never get another rope around his neck. Upon that he was resolved. For two days and nights he neither ate nor drank, and during those two days and nights of torment, he accumulated a fund of wrath that boded ill for whoever first fell foul of him. His eyes turned bloodshot, and he was metamorphosed into a raging fiend. So changed was he that the Judge himself would not have recognized him; and the express messengers breathed with relief when they bundled him off the train at Seattle. Four men gingerly carried the crate from the wagon into a small, high-walled back yard. A stout man, with a red sweater that sagged generously at the neck, came out and signed the book for the driver. That was the man, Buck divined, the next tormentor, and he hurled himself savagely against the bars. The man smiled grimly, and brought a hatchet and a club. "You ain't going to take him out now?" the driver asked. "Sure," the man replied, driving the hatchet into the crate for a pry. There was an instantaneous scattering of the four men who had carried it in, and from safe perches on top the wall they prepared to watch the performance. Buck rushed at the splintering wood, sinking his teeth into it, surging and wrestling with it. Wherever the hatchet fell on the outside, he was there on the inside, snarling and growling, as furiously anxious to get out as the man in the red sweater was calmly intent on getting him out. "Now, you redeyed devil," he said, when he had made an opening sufficient for the passage of Buck's body. At the same time he dropped the hatchet and shifted the club to his right hand. And Buck was truly a redeyed devil, as he drew himself together for the spring, hair bristling, mouth foaming, a mad glitter in his bloodshot eyes. Straight at the man he launched his one hundred and forty pounds of fury, surcharged with the pent passion of two days and nights. In midair, just as his jaws were about to close on the man, he received a shock that checked his body and brought his teeth together with an agonizing clip. He whirled over, fetching the ground on his back and side. He had never been struck by a club in his life, and did not understand. With a snarl that was part bark and more scream he was again on his feet and launched into the air. And again the shock came and he was brought crushingly to the ground. This time he was aware that it was the club, but his madness knew no caution. A dozen times he charged, and as often the club broke the charge and smashed him down. After a particularly fierce blow he crawled to his feet, too dazed to rush. He staggered limply about, the blood flowing from nose and mouth and ears, his beautiful coat sprayed and flecked with bloody slaver. Then the man advanced and deliberately dealt him a frightful blow on the nose. All the pain he had endured was as nothing compared with the exquisite agony of this. With a roar that was almost lionlike in its ferocity, he again hurled himself at the man. But the man, shifting the club from right to left, coolly caught him by the under jaw, at the same time wrenching downward and backward. Buck described a complete circle in the air, and half of another, then crashed to the ground on his head and chest. For the last time he rushed. The man struck the shrewd blow he had purposely withheld for so long, and Buck crumpled up and went down, knocked utterly senseless.9Select all the correct answers.Which two themes are explored in the passage?A survival of the fittestB value of friendshipC grief over losing a friendD joy of uniting after agesE power of humans over animals PLESSSSS HELP(11.02 LC)Read the poem "A Beautiful View":The Belvedere Castle stands high in the sky,A majestic fortress, pleasing to the eye.The castle's a queen, viewing subjects below.Her turret eye welcomes all to the chateau.When visitors enter, there's so much to do:Go out on the balcony, enjoy the view,Or learn about nature, or purchase a snack,Or birdwatch in Central Park with a field pack.The view is a mustit inspired the name:A "beautiful view" is the castle's main aim.Look down to see turtles who swim with wide strokesThrough silence that's broken by frogs' mighty croaks.Beyond lies the Great Lawnits fame known worldwideFor concerts and picnics and places to bide.The Delacorte Theatre brings plays to life.The characters' voices ring out, full of strife.If visitors turn south, they'll see quite the scene:A vast landscape of rocks, trails, and trees so green.Wherever the visitors choose to explore,The Belvedere Castle shows there's always more.What does the author do for the reader in the first stanza of "A Beautiful View"?In the first stanza, the author explains that Belvedere Castle is a miniature chateau.In the first stanza, the author explains the difference between a chateau and a castle.In the first stanza, the author introduces the character of the queen.In the first stanza, the author introduces the setting of Belvedere Castle. explain a possible scenario at a molecular level that gleevec resistance ASAP Dr. Rollins is both an anthropologist and archeologist. While excavating some ruins in South America, he discovered a scale drawing of a replica of a Mayan pyramid.-The scale for the drawing to the replica was 1 inch : 2 feet.- The scale for the replica to the actual pyramid was 1 foot : 14 feet.If the height of the pyramid on the drawing was 3 1/2 inches, what was the height of the actual pyramid?A. 98 feetB. 49 feetC. 91 feetD. 196 feet Two organ pipes are open at both ends. Both are hit and are sounded at their first harmonic, 5 beats/second are heard. One pipe is985 mm long. Calculate the possible length of the other pipe. (Use GUESS method. Working equation not required) Answer L=1014 mm or 958 mm Using source C, which claim best explains how the Mayan ruler was chosen?AAt the very top of the social order were the Maya kings.BThe king was considered a sacred ruler, one who governed by divine right. Believed to be the descendant of a god, a kings authority was unquestioned and absolute. CLosing at war was a sure sign that a king had lost the favor of the gods.DIf a woman did take power, however, it was usually as a widow of a king or as the mother of a prince. Adjacent angles. View the photo ccd