the star vega has a measured angular diameter of 3.24 mas (miliarcseconds) and a flux of 2.84 x 10-8 w/m2. its distance is 8.1 pc. what are vega’s diameter and effective temperature?

If a 100 microfarad capacitor is charged off of a 12-volt battery, the voltage between the terminals of the capacitor will eventually reach 12 volts when it is fully charged. Initially, when the capacitor is uncharged, the voltage across its terminals is zero.

However, when it is connected to the battery, current flows from the battery to the capacitor, charging it up. As the capacitor charges, the voltage across its terminals increases until it reaches the same voltage as the battery (in this case, 12 volts). The time it takes for the capacitor to fully charge depends on the resistance of the circuit in which it is connected.

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The change in internal energy for the system is 107j.

The change in internal energy for the system can be determined using the first law of thermodynamics, which states that the change in internal energy of a system is equal to the sum of the work done on the system and the heat added to the system. Therefore:

ΔU = Q + W

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done on the system.

Using the values given in the question, we can plug in the numbers:

ΔU = 24j + 83j

ΔU = 107j

a device performs 83j of work and releases 24j of heat, determine the change in internal energy for the system,.Therefore, the change in internal energy for the system is 107j.

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Therefore, the magnitude of the second charge is 0.066 µC.

The electric force between two point charges is given by Coulomb's law: Here F is the force, k is the Coulomb constant, q1 and q2 are the magnitudes of the charges, and r is the distance between the charges.

In this problem, we have two charges with equal magnitudes of 1.0 µC, and they each experience a force of 1.0 µN at a distance of 15 m. Plugging in the given values, we get:

[tex]F = k * (q1 * q2) / r^2[/tex]

1.0 µN =[tex](9.0 * 10^9 N*m^2/C^2)[/tex] *[tex](1.0 uC)^2[/tex] / (15 m)^2

The unknown charge q2:

q2 = [tex]\sqrt{((1.0 uN * 15 m)^2 / (9.0 * 10^9 N*m^2/C^2))}[/tex]

q2 = 0.066 µC

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No, the wattage rating of an electrical appliance does not depend on how long the appliance is on. The wattage rating of an electrical appliance is a measure of its power, which is defined as the rate at which energy is used or transferred. In other words, power is the amount of work done or energy consumed per unit of time.

The wattage rating of an appliance represents the amount of power the appliance is designed to use or consume when operating at its maximum capacity. It does not take into account the duration of time for which the appliance is on.

For example, a 100-watt light bulb will consume 100 watts of power regardless of whether it is turned on for 1 hour or 10 hours.

The power rating of an appliance is important for determining its electrical requirements, such as the voltage and current needed for proper operation.

It is also used for estimating energy usage and calculating electricity costs. However, the wattage rating itself does not depend on the duration of time the appliance is on, as power is a measure of the rate of energy consumption or transfer, not the total amount of energy used over time.

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The fracture toughness of a material increases with increasing temperature, the given statement is false because it is not dependent on temperature. Creep can be best described as B. slow elongation under high load at elevated temperature

Fracture toughness is a property of a material that describes its resistance to crack propagation. It is not necessarily dependent on temperature, but rather on the composition and microstructure of the material. However, some materials may exhibit a reduction in fracture toughness at elevated temperatures due to thermal stresses and microstructural changes.

Creep is a deformation mechanism that occurs in materials under prolonged exposure to high stress and temperature, it is a time-dependent process that causes gradual plastic deformation and elongation over time. The elongation is slow and occurs under high load and elevated temperature, and it can lead to structural failure over time if not properly accounted for in design and engineering applications. The first statement is false because it is not dependent on temperature. the second question creep can be best described as B. slow elongation under high load at elevated temperature

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If the diverging lens is 39 cm from the converging lens, then the final image will be to the left of the diverging lens.

To solve this problem, we need to first find the location of the intermediate image formed by the converging lens. We can use the lens formula:

1/f = 1/do + 1/di

where f is the focal length, do is the object distance, and di is the image distance.

For the converging lens:
f = 19 cm, do = 36 cm

1/19 = 1/36 + 1/di

Solving for di, we get di = 28.44 cm (rounded to 2 decimal places)

Now, let's consider the new distance between the lenses: 39 cm. The object distance for the diverging lens becomes:

do = 28.44 cm + 39 cm = 67.44 cm

For the diverging lens:
f = -11 cm, do = 67.44 cm

1/-11 = 1/67.44 + 1/di

Solving for di, we get di = -15.09 cm (rounded to 2 decimal places)

Since the image distance is negative, the final image is formed to the left of the diverging lens.

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The speed v(c) of the center of mass of the system after the pod is launched is equal to v(f).

Mass of the pod, m₁ = m

Mass of the spaceship, m₂ = 6m

The conservation of momentum principle states that, within a given domain, the amount of momentum is constant such that, momentum is never created nor destroyed, but only modified by the application of forces.

So, according to the conservation of momentum, the momentum before launch and before launch must be equal. Therefore, the speed of the center of mass of the system becomes equal to the speed with which the spaceship is moving towards the right.

Therefore,

v(c) = v(f)

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It's worth noting that the negative signs in the lens equation and magnification formula indicate that the image formed by a diverging lens is always virtual and upright. This means that the light rays from the object are diverging when they reach the lens, and the lens bends the light rays so that they appear to be coming from a virtual image point on the opposite side of the lens.

In terms of the magnification, a magnification of 0.40 means that the image is 40% the size of the object, but it is also inverted. So, if the object is an upright arrow, the image will be a smaller, inverted arrow. It's also worth noting that a diverging lens always has a negative focal length, which means that it always forms virtual images that are smaller than the object. Diverging lenses are used in eyeglasses to correct nearsightedness, and in certain optical instruments to spread out light or reduce its intensity.

The magnification formula for a diverging lens is:

m = -di/do

where m is the magnification, di is the image distance, and do is the object distance.

The focal length (f) of the lens is related to the image and object distances by the lens equation:

1/f = 1/di + 1/do

Substituting the given value of focal length (f = -10 cm) into the lens equation, we get:

1/-10 cm = 1/di + 1/do

Simplifying this equation, we can rearrange it to solve for di:

di = -do / (m - 1)

Substituting the given magnification (m = 0.40) into this equation, we get:

di = -do / (0.40 - 1)

di = -do / (-0.60)

di = 1.67 do

Therefore, the image distance is 1.67 times the object distance. To find the object distance that gives a magnification of 0.40, we can set di = -0.40 do (since m = -di/do) and solve for do:

-0.40 do = 1.67 do

Simplifying this equation, we get:

do = di / (-0.40)

do = -1.67 di

Therefore, the object distance that gives a magnification of 0.40 is 1.67 times the image distance. If we assume that the image is formed at the lens' focal length (di = -10 cm), then the object distance is:

do = -1.67 di

do = -1.67 (-10 cm)

do = 16.7 cm

Therefore, the object distance at which the magnification is 0.40 is 16.7 cm.

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The amount of ice that melts is approximately 0.596 g.

To solve this problem, we need to use the conservation of momentum and the conservation of energy.

Let's begin by finding the velocity of the hammer and nail after the collision. We can use the conservation of momentum to do this:

(mass of hammer + mass of nail) x initial velocity of hammer = (mass of hammer + mass of nail) x final velocity of hammer and nail

(0.5 kg + m) x 2 m/s = (0.5 kg + m) x 0

where m is the mass of the nail.

Solving for m, we get:

m = 0.25 kg

So the mass of the nail is 0.25 kg.

Now we can use the conservation of energy to find the amount of ice that melts. The initial kinetic energy of the hammer and nail is:

KE = 0.5 x 0.5 kg x (2 m/s)^2 = 1 J

The final kinetic energy of the hammer and nail is zero, since they come to rest.

The energy required to melt the nail and the ice that it is in contact with is:

Q = (mass of nail + mass of melted ice) x heat of fusion of ice

We can assume that all the energy from the hammer's kinetic energy is used to melt the nail and the ice.

So we have:

1 J = (0.25 kg + m) x 80 cal/g x 4.184 J/cal

Solving for m, we get:

m = 0.596 g

Therefore, the amount of ice that melts is approximately 0.596 g.

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Therefore, the kinetic energy required for electrons to resolve a large organic molecule of size 10 nm is approximate: [tex]9.18 * 10^{-3 }[/tex] eV.

The de Broglie wavelength of a particle is given by:

λ = h/p

For a non-relativistic particle, the momentum can be expressed as:

p = mv

where m is the mass of the particle and v is its velocity.

Equating these two expressions for p and solving for v, we get:

v = p/m = h/(mλ)

The kinetic energy of the particle can be expressed in terms of its velocity as:

For an organic molecule of size 10 nm, we can estimate its effective radius as half its size, or 5 nm. The de Broglie wavelength required to resolve this object is therefore:

λ = h/p = h/(mv) = h/(m√(2K/m)) = h/√(2mK)

where we have used the expression for velocity in terms of kinetic energy derived above.

Equating λ with the size of the object, we get:

λ = 2r = 10 nm

Substituting for λ and solving for K, we get:

[tex]K = (h^2/8mr^2) = (6.626 * 10^{-34} J s)^2/(8 * 9.109 * 10^{-31 }kg * (5 * 10^{-9 }m)^2)\\ = 9.18 * 10^{-3} eV[/tex]

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The total time taken by the sprinter is 3.73 seconds.

Let's assume that the sprinter maintains a constant speed of 10.5 m/s after reaching it.

The time taken to reach the top speed is given as 2.44 seconds.

The distance covered during the time taken to reach the top speed can be calculated using the formula:

[tex]d = (1/2)*a*t^{2}[/tex]

Assuming that the sprinter starts from rest, the initial velocity is 0 m/s. The acceleration can be calculated as:

[tex]a = (v_f-v_i)/t = (10.5m/s-0m/s)/2.44s = 4.30m/s^{2}[/tex]

Substituting the values, we get:

[tex]d = (1/2)*4.30m/s^{2} * (2.44s)^{2} = 13.5[/tex]

The time taken to cover the remaining distance at a constant speed of 10.5 m/s can be calculated using the formula:

[tex]t = d/v = 13.5/10.5 m/s = 1.29s[/tex]

Therefore, the total time taken by the sprinter is:

total time = time taken to reach top speed + time taken to cover distance at top speed

= 2.44 s + 1.29 s

= 3.73 s

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Bead A and Bead B, with masses of 14g and 24g and charges of -4.9 nC and -14.3 nC, respectively, will repel each other when placed 14 cm apart and released. The force between them is governed by Coulomb's Law, which influences their acceleration as they move away from each other.

Bead A and Bead B are both negatively charged, with masses of 14g and 24g, respectively. Bead A has a charge of -4.9 nC (nanocoulombs), while Bead B has a charge of -14.3 nC. They are initially positioned 14 cm apart from each other, measured between their centers.

Since both beads have negative charges, they will experience a repulsive force due to Coulomb's Law. This law states that the force between two charged objects is directly proportional to the product of their charges and inversely proportional to the square of the distance between them. The force can be calculated using the formula: F = (k * q1 * q2) / r^2, where F is the force, k is the electrostatic constant (8.99 x 10^9 Nm^2/C^2), q1 and q2 are the charges of the beads, and r is the distance between them.

Upon release, both beads will experience a repulsive force that causes them to accelerate in opposite directions, with the acceleration depending on their respective masses. As they move apart, the repulsive force decreases due to the increasing distance between the beads. Consequently, their acceleration will also decrease.

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a. The critical value of the function the function f(x) = x² - 4x + 9 is 2 (Option A).

b. The relative minimum point is (2, 5) and there are no relative maximum points (Option B).

To find the critical values and relative extrema of the function f(x) = x² - 4x + 9, we first need to find its derivative:

f'(x) = 2x - 4

Now, we find the critical values by setting the derivative equal to zero:

2x - 4 = 0

2x = 4

x = 2

So, the critical value of the function is 2.

Now, to find the relative extrema, we analyze the concavity of the function at the critical point:

f''(x) = 2

Since f''(x) > 0 for all x, the function is concave up, which means we have a relative minimum at the critical point. To find the value of the function at the critical point, we plug x = 2 back into the original function:

f(2) = (2)² - 4(2) + 9

= 4 - 8 + 9 = 5

So, the relative minimum point is (2, 5) and there are no relative maximum points.

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To determine the radius of the proton's circular path, we can use the formula for the centripetal force acting on a charged particle moving in a magnetic field:

F = qvb

where F is the centripetal force, q is the charge of the particle, v is its velocity, and B is the magnetic field strength.

The centripetal force is provided by the magnetic force, which can be expressed as:

F = mv^2 / r

where m is the mass of the particle and r is the radius of the circular path.

Equating these two expressions for F, we get:

mv^2 / r = qvb

Solving for r, we get:

r = mv / qb

To find the velocity of the proton, we can use the formula for the kinetic energy of a particle:

KE = (1/2)mv^2

Solving for v, we get:

v = sqrt(2KE / m)

Substituting this expression for v into the equation for r, we get:

r = sqrt(2KE / m) * m / qb

Substituting the given values, we get:

r = sqrt(2 * 4.8×10^-16 / 1.67×10^-27) * 1.67×10^-27 / (1.6×10^-19 * 0.37)

r = 0.010 cm (rounded to three significant figures)

Therefore, the radius of the proton's circular path is 0.010 cm.

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If you were looking at two stars, both at the same distance, with star A being a G5 I (a supergiant) and star B being a G5 III (a giant), the difference in appearance through a telescope would be their brightness. In this case, star A (G5 I) would be brighter, making option A the correct answer.

Both stars would appear the same brightness in a telescope because their distance is the same. However, the main difference between them is their luminosity class, with star A being a main sequence star (luminosity class I) and star B being a giant star (luminosity class III). This difference in luminosity class suggests that star B is older and has exhausted more of its fuel than star A, which is still in its main sequence phase.

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Answer:

Explanation:

by Newton's second law:

F = m*a

F = 50*2 = 100 Newton

The angle at which light emerges from the opposite face of the equilateral glass prism is 51.2°.

Refraction is the bending of light when it passes from one medium to another. The angle of refraction is determined by the angle of incidence and the refractive index of the medium through which it is travelling.

The angle at which light emerges from the opposite face of the equilateral glass prism can be calculated using the concept of refraction.

In this case, the angle of incidence is 45° and the refractive index of the medium is 1.52.

Using Snell's law of refraction, the angle of refraction can be calculated as follows:

n₁ sinθ₁ = n₂ sinθ₂

Where n₁ is the refractive index of the incident medium, θ₁ is the angle of incidence, n₂ is the refractive index of the emergent medium, and θ₂ is the angle of refraction.

Therefore, substituting the values for n₁, θ₁ and n₂, the angle of refraction can be calculated as follows:

1.52 sin 45° = n₂ sinθ₂

n₂ sinθ₂ = 1.52 sin 45°

n₂ sinθ₂ = 1.08

θ₂ = sin-¹ (1.08/n₂)

θ₂ = sin-¹ (1.08/1.52)

θ₂ = 51.2°

Therefore, the angle at which light emerges from the opposite face of the equilateral glass prism is 51.2°.

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The correct option is b. When you jump off the floor, the floor exerts a force on you that is opposite to and equal to your weight. This force is called the reaction force and it is a fundamental law of physics known as Newton's Third Law of Motion.

When you push against the floor, the floor pushes back with the same force in the opposite direction, allowing you to jump upwards. This force is equal to your weight because of gravity, which is pulling you down toward the ground.

If the force was less than your weight, you would not be able to jump off the floor as you would not be able to overcome gravity. If the force was greater than your weight, you would be pushed upwards with a greater force and jump higher than intended.

Therefore, option B is the correct answer as the floor exerts a force opposite to and equal to your weight when you jump off the floor.

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Gravitational redshift is a phenomenon where the wavelength of light is stretched due to the influence of gravity, as predicted by Einstein's theory of general relativity.

The amount of redshift depends on the strength of the gravitational field and the distance from the source of the field. In this case, we are asked to calculate the gravitational redshift of radiation emitted from a neutron star with a mass of 5.8 × 10^30 kg and a radius of 10 km, and detected far away from the star. We can use the formula for gravitational redshift, which relates the change in wavelength to the ratio of the gravitational potential at the source and the observer. In this case, the redshift is calculated to be approximately 0.44 nm, which is a very small shift in wavelength. This result is consistent with the high density and strong gravitational field near a neutron star, and it is also important for understanding the behavior of light in extreme conditions.

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it can be expressed as:

r = (Nt - N0) / (t - t0)

where:
- Nt is the population size at time t
- N0 is the population size at time t0
- t is the final time
- t0 is the initial timetime.

The population growth equation is given by:

Nt = N0 * e^(rt).

1) The expression that defines change in population in unit change in time is the population growth rate, which is typically denoted as "r". The population growth rate is the rate at which a population is increasing or decreasing over a given time interval. Mathematically, it can be expressed as:

r = (Nt - N0) / (t - t0)

where:
- Nt is the population size at time t
- N0 is the population size at time t0
- t is the final time
- t0 is the initial time

2) The expression that defines the final population size is simply Nt, which represents the population size at a given time t.

The final population size, Nt, can be calculated using the population growth equation, which takes into account the population growth rate, r, and the initial population size, N0. The population growth equation is given by:

Nt = N0 * e^(rt)

where:
- e is the mathematical constant e (approximately 2.71828)
- r is the population growth rate
- t is the time interval over which the population is growing or declining

The population growth equation assumes exponential growth or decline, which means that the rate of change of the population is proportional to the current population size. If the population growth rate is positive, the population is increasing, and if the growth rate is negative, the population is decreasing.

It's important to note that the population growth equation is a simplified model and may not accurately represent the dynamics of all populations in all situations. Factors such as limited resources, competition, and environmental changes can all affect population growth rates and the final population size.

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(a)the angular acceleration of the flywheel is 16.7 rad/s^2.

(b)the linear velocity of a point on the rim of the wheel after 15.0 s is 50 m/s.

(c)the wheel makes approximately 29.8 revolutions during the 15.0 s.

(a) The initial angular velocity of the flywheel, ω0 = 0. The final angular velocity, ω = 250 rad/s. The time, t = 15.0 s. Using the formula,

ω = ω0 + αt

where α is the angular acceleration, we can solve for α:

α = (ω - ω0)/t = 250 rad/s / 15.0 s = 16.7 rad/s^2

Therefore, the angular acceleration of the flywheel is 16.7 rad/s^2.

(b) The linear velocity, v, of a point on the rim of the wheel is given by:

v = rω. where r is the radius of the wheel. Substituting r = 0.2 m and ω = 250 rad/s, we get:

v = (0.2 m)(250 rad/s) = 50 m/s

Therefore, the linear velocity of a point on the rim of the wheel after 15.0 s is 50 m/s.

(c) The number of revolutions made by the wheel during the 15.0 s can be calculated using the formula: θ = ω0t + (1/2)αt^2

where θ is the angular displacement of the wheel. Since the wheel starts from rest, ω0 = 0. Also, the final angular velocity, ω, is given by:

ω^2 = ω0^2 + 2αθ

Solving for θ, we get: [tex]θ = (ω^2 - ω0^2) / 2α = (250^2 - 0^2) / (2 x 16.7) = 187.1 rad[/tex]

The number of revolutions, N, made by the wheel can be calculated as:

N = θ / 2π = 187.1 rad / (2π) = 29.8 revolutions (approx)

Therefore, the wheel makes approximately 29.8 revolutions during the 15.0 s.

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Hi! To find the order of magnitude of the kinetic energy of the electron, we can use the relationship between linear momentum (p), mass (m), and kinetic energy (KE):

p = √(2m * KE)

We know the linear momentum (p) and the mass of an electron (m = 9.11 × 10^-31 kg). Let's solve for KE:

KE = (p^2) / (2m)

Plugging in the values:

KE ≈ ((4.0 × 10^-25 kg m/s)^2) / (2 × 9.11 × 10^-31 kg)

KE ≈ 8.79 × 10^-19 J

The order of magnitude of the kinetic energy of the electron is 10^-19 J. So, the correct answer is C. 10^-19 J.

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(A) The Angular velocity, is 95 rpm.  (B) During the 10-second period, the wheel makes approximately 11.83 revolutions.

To find the number of revolutions the wheel makes during this time, we'll first calculate the final angular velocity and then use the equations of motion to find the total angular displacement.
A) We've already calculated the final angular velocity, which is 95 rpm.
B) To find the number of revolutions during this time, follow these steps:
1. Convert the initial and final angular velocities from rpm to rad/s:
Initial angular velocity (ωi) = 47 rpm * (2π rad/1 rev) * (1 min/60 s) = 4.928 rad/s
Final angular velocity (ωf) = 95 rpm * (2π rad/1 rev) * (1 min/60 s) = 9.95 rad/s
2. Use the formula for angular displacement with constant angular acceleration:
Δθ = ωi * t + 0.5 * α * ²
where Δθ is the angular displacement, t is the time (10 s), and α is the angular acceleration (0.50 rad/s²).
3. Plug in the values:
Δθ = (4.928 rad/s) * (10 s) + 0.5 * (0.50 rad/s²) * (10 s)²
Δθ = 49.28 rad + 25 rad
Δθ = 74.28 rad
4. Convert the angular displacement from radians to revolutions:
Number of revolutions = Δθ * (1 rev/2π rad)
Number of revolutions = 74.28 rad * (1 rev/6.2832 rad) ≈ 11.83 revolutions
During the 10-second period, the wheel makes approximately 11.83 revolutions.

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a) The longest wavelength photon that an excited state of the electron trapped in an infinitely deep square well can emit is 155 nm.

This can be calculated using the equation: λ = c / ∆E, where λ is the wavelength, c is the speed of light, and ∆E is the energy difference between the excited state and the ground state. Substituting the given values, we get: λ = (3.00 x 10^8 m/s) / (8.0 x 10^-19 J) = 155 nm.

b) The width of the well is 2.48 nm.

This can be calculated using the equation: l = λ / 2, where l is the width of the well and λ is the wavelength of the emitted photon, which we calculated to be 155 nm in part (a).

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the elongation of the cylindrical steel alloy specimen with a diameter of 10.0 mm and length of 75 mm, when subjected to a tension load of 20,000 N, is approximately 0.095 mm.

To determine the elongation of a cylindrical steel alloy specimen when a load is applied, we can use the formula:
Elongation (ΔL) = (Load (F) × Length (L₀)) / (Area (A) × Young's Modulus (E))
First, let's find the cross-sectional area of the cylindrical specimen:
A = π × (diameter / 2)²
A = π × (10.0 mm / 2)²
A = 78.54 mm²
Next, we need the Young's Modulus (E) of the steel alloy. This value is typically provided, but for this example, let's assume E = 200 GPa (200 x 10^3 MPa).
Now we can calculate the elongation:
ΔL = (20,000 N × 75 mm) / (78.54 mm² × 200,000 MPa)
ΔL = (1,500,000 N·mm) / (15,708,000 N)
ΔL ≈ 0.095 mm
So, the elongation of the cylindrical steel alloy specimen with a diameter of 10.0 mm and length of 75 mm, when subjected to a tension load of 20,000 N, is approximately 0.095 mm.

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The magnitude of gravitational force acting on the space junk by the satellite is determined by the masses of the objects and the distance between them.

To calculate the magnitude of the gravitational force acting on the space junk by the satellite, you need to use the formula for gravitational force: F = G × (m1 × m2) / r² where: - F is the gravitational force, - G is the gravitational constant (approximately 6.674 × 10⁻¹¹ N m²/kg²), - m1 and m2 are the masses of the satellite and space junk, respectively, - r is the distance between the centers of mass of the satellite and space junk.

The larger the masses and the closer the objects are, the stronger the gravitational force. However, it is important to note that space junk is typically not in orbit around a satellite and therefore not subject to its gravitational force. Instead, space junk is affected by the gravitational force of the Earth and other celestial bodies, as well as other forces such as atmospheric drag and solar radiation pressure.

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The force experienced by a cosmic ray electron that moves perpendicular to the Earth's magnetic field at an altitude where the field strength is 1.0 x 10⁻⁵ T is   -1.0025 x 10^-11 N.

The problem asks us to find the force experienced by a cosmic ray electron that moves perpendicular to the Earth's magnetic field at an altitude where the field strength is 1.0 x 10⁻⁵ T. We can use the formula F = qvB, where F is the force experienced by the electron, q is its charge, v is its velocity, and B is the magnetic field strength.

In this case, we know the velocity of the electron is 6.25 x 10⁷ m/s and the magnetic field strength is 1.0 x 10⁻⁵ T. However, we don't know the charge of the electron. We can assume it is the same as the charge of an electron, which is -1.602 x 10⁻¹⁹ C.

So, plugging in the values into the formula, we get:

F = (-1.602 x 10⁻¹⁹ C) x (6.25 x 10⁷ m/s) x (1.0 x 10^-5 T)

F = -1.0025 x 10⁻¹¹ N

Therefore, the force experienced by the cosmic ray electron is -1.0025 x 10⁻¹¹ N. Note that the negative sign indicates that the force is in the opposite direction to the velocity of the electron, which is consistent with the fact that the electron is moving perpendicular to the magnetic field.

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Answer:

We can solve this problem by using the concept of relative motion. Let's assume that the first boy is running in the clockwise direction and the second boy is chasing him in the counterclockwise direction.

Since the second boy always remains on the radius connecting the center of the circle and the first boy, the distance between them is always equal to the radius of the circle, which is 28 m.

Let's denote the distance covered by the first boy as S1 and the distance covered by the second boy as S2. We know that the first boy is running with a constant speed of 4 m/s, so we can write:

S1 = u*t1

where t1 is the time taken by the first boy to complete the chase.

The second boy is moving with a constant velocity of 4 m/s towards the first boy, so we can write:

S2 = V*t2

where t2 is the time taken by the second boy to catch up with the first boy.

Since the second boy is always moving on the radius connecting the center of the circle and the first boy, the distance covered by him is equal to the distance on the circumference of the circle covered by the first boy, minus the distance covered by the first boy along the radius. We can write:

S2 = S1 - 2*pi*R

where pi is the mathematical constant pi (approximately equal to 3.14).

Substituting the values of S1 and S2, we get:

u*t1 = V*t2 + 2*pi*R

Since the time of chase is (10 + x) sec, we can also write:

t1 + t2 = 10 + x

We have two equations and two unknowns (t1 and t2), so we can solve for them. First, we can solve for t2:

t2 = (u*t1 - 2*pi*R) / V

Substituting this in the second equation, we get:

t1 + (u*t1 - 2*pi*R) / V = 10 + x

Simplifying this equation, we get:

t1*(1 + u/V) = 10 + x + 2*pi*R/V

Finally, we can solve for t1:

t1 = (10 + x + 2*pi*R/V) / (1 + u/V)

Substituting the given values of R, u, and V, we get:

t1 = (10 + x + 56*pi) / 20

Simplifying this expression, we get:

t1 = 2.8*pi + 0.5*x + 2.8

Therefore, the time taken by the first boy to complete the chase is 2.8*pi + 0.5*x + 2.8 seconds.

Explanation:

this gives me nightmare

Power rating of the motor will be 11.38 kW

To calculate the power rating of the motor needed to move the elevator at a constant speed, we can use the formula for power:

Power = Force x Velocity

First, we need to determine the force acting on the elevator. Since it is moving at a constant speed, the force is equal to the gravitational force:

Force = Mass x Gravity
Force = 1785 kg x 9.81 m/s²
Force = 17505.85 N

Now, we can calculate the power:

Power = Force x Velocity
Power = 17505.85 N x 0.650 m/s
Power = 11378.8025 W

So, the power rating of the motor required to move the elevator downwards at a constant speed of 0.650 m/s is approximately 11,378.8 W or 11.38 kW.

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