Answer:
1-B, 2-A, 3-D, 4-C
Explanation:
1. The force exerted is, F = 35 N
Distance the box is moved, d = 4 m
So the amount of work done is, W = F x d
= 35 x 4
= 140 Newton-meters
2. Work done, W = 420 Nm
Time, T = 3 seconds
Therefore, the power required is,
[tex]$P=\frac{W}{T}$[/tex]
[tex]$P=\frac{420}{3}$[/tex]
= 140 joules
3. The force exerted is, F = 1.2 N
Distance the box is moved, d = 5 m
So the amount of work done is, W = F x d
= 1.2 x 5
= 6 Newton-meters
4. Work done, W = 120 Nm
Time, T = 20 seconds
Therefore, the power required is,
[tex]$P=\frac{W}{T}$[/tex]
[tex]$P=\frac{120}{20}$[/tex]
= 6 joules
Students conduct an experiment to study the motion of two toy rockets. In the first experiment, rocket X of mass mR is launched vertically upward with an initial speed v0 at time t=0. The rocket continues upward until it reaches its maximum height at time t1. As the rocket travels upward, frictional forces are considered to be negligible. The rocket then descends vertically downward until it reaches the ground at time t2. The figure above shows the toy rocket at different times of its flight. In a second experiment, which has not yet been conducted by the students, rocket Y of mass MR, where MR>mR, will be launched vertically upward with an initial speed v0 at time t=0 until it reaches its maximum height. Rocket Y will then descend vertically downward until it reaches the ground. Two students in the group make predictions about the motion of rocket Y compared to that of rocket X. Their arguments are as follows. Student 1: "Rocket Y will have a smaller maximum vertical displacement than rocket X, although it is launched upward with the same speed as rocket X and has more kinetic energy than rocket X. Because rocket Y will have a smaller maximum vertical displacement than rocket X, I predict that it will take less time for rocket Y to reach the ground compared with rocket X." Student 2: "Rocket Y will have the same maximum vertical displacement as rocket X because both rockets have the same kinetic energy. Since both rockets will have the same maximum vertical displacement, I predict that it will take both rockets the same amount of time to reach the ground." (a) For part (a), ignore whether the students’ predictions are correct or incorrect. Do not simply repeat the students’ arguments as your answers. i. Which aspects of Student 1’s reasoning, if any, are correct? Explain your answer. ii. Which aspects of Student 1’s reasoning, if any, are incorrect? Explain your answer. iii. Which aspects of Student 2’s reasoning, if any, are correct? Explain your answer. iv. Which aspects of Student 2’s reasoning, if any, are incorrect? Explain your answer. (b) Use quantitative reasoning, including equations as needed, to derive expressions for the maximum heights achieved by rocket X and rocket Y. Express your answer in terms of v0, mR, MR, g, and/or other fundamental constants as appropriate. (c) Use quantitative reasoning, including equations as needed, to derive expressions for the time it takes rocket X and rocket Y to reach the ground after reaching their respective maximum heights, HX and HY. Express your answer in terms of v0, mR, MR, HX, HY, g, and/or other fundamental constants as appropriate. (d) i. Explain how any correct aspects of each student’s reasoning identified in part (a) are expressed by your mathematical relationships in part (b). ii. Explain how any correct aspects of each student’s reasoning identified in part (a) are expressed by your mathematical relationships in part (c).
(a)
i. Student 1's reasoning correctly acknowledges that rocket Y will have more kinetic energy than rocket X, given that it has a greater mass (MR > mR) but is launched upward with the same speed (v0). This understanding of the relationship between mass, kinetic energy, and initial speed is correct.
ii. However, Student 1's prediction that rocket Y will have a smaller maximum vertical displacement compared to rocket X is incorrect. The maximum vertical displacement depends on factors such as the initial speed, mass, and gravitational acceleration. The student's prediction does not take into account these factors and is therefore incorrect.
iii. Student 2's reasoning correctly states that both rockets will have the same maximum vertical displacement because they have the same initial speed (v0) and neglects the impact of mass. This understanding is incorrect since mass does affect the motion of the rockets and should be considered.
iv. Student 2's prediction that both rockets will take the same amount of time to reach the ground is incorrect. The time taken to reach the ground depends on factors such as the maximum height and gravitational acceleration, and the mass of the rocket does influence this time.
(b) To derive expressions for the maximum heights achieved by rocket X and rocket Y, we can use the conservation of energy. The initial kinetic energy of each rocket is given by (1/2)mRv0². The gravitational potential energy at the maximum height is (mR or MR)gh, where h is the maximum height and g is the acceleration due to gravity.
For rocket X: (1/2)mRv0² = mRghX, where hX is the maximum height of rocket X.
For rocket Y: (1/2)MRv0² = MRgHY, where HY is the maximum height of rocket Y.
(c) To derive expressions for the time it takes rocket X and rocket Y to reach the ground after reaching their respective maximum heights, we can use the kinematic equation for motion under constant acceleration. The equation is given by:
t = √(2h/g), where t is the time, h is the height, and g is the acceleration due to gravity.
For rocket X: tX = √(2hX/g), where tX is the time taken by rocket X to reach the ground after reaching its maximum height.
For rocket Y: tY = √(2hY/g), where tY is the time taken by rocket Y to reach the ground after reaching its maximum height.
(d)
i. Student 1's correct understanding of the relationship between kinetic energy, mass, and initial speed is expressed in the equation for maximum height. The greater mass of rocket Y results in a larger value for MR in the equation, leading to a higher maximum height compared to rocket X.
ii. Student 2's correct understanding that both rockets will have the same maximum vertical displacement is expressed by setting the equations for a maximum height of rocket X and rocket Y equal to each other. By equating the heights, we can derive an expression that eliminates the difference in mass and focuses on the common variables, such as initial speed and gravitational acceleration. However, the prediction that both rockets will take the same time to reach the ground is not supported by the equations for time, which show a dependency on the respective maximum heights.
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A snowflake gets blown sideways 2 ft for every 4 ft it falls downward. In one such movement, what is the total distance the snowflake travels and in what direction? 3.46 ft at 28.6° from straight downwards. 4.49 ft at 28.6° from straight downwards. 0 4.47 ft at 26.6° from straight downwards. O 3.46 ft at 36.6° from straight downwards.
The snowflake travels a total distance of approximately 4.49 ft at an angle of 28.6° from straight downwards.
Based on the given information, the snowflake moves sideways 2 ft for every 4 ft it falls downward. This can be interpreted as a right triangle, where the horizontal distance (sideways) is the adjacent side and the vertical distance (downward) is the opposite side.
Using the Pythagorean theorem, we can calculate the total distance traveled by the snowflake:
Total distance = √(horizontal distance^2 + vertical distance^2)
= √((2 ft)^2 + (4 ft)^2)
= √(4 ft^2 + 16 ft^2)
= √(20 ft^2)
≈ 4.47 ft
The direction can be found using trigonometry. We can use the tangent function to determine the angle:
tan(angle) = (opposite side) / (adjacent side)
tan(angle) = (4 ft) / (2 ft)
angle = arctan(2)
angle ≈ 63.4°
However, the question asks for the angle from straight downwards, which is the complement of the calculated angle. Therefore, the angle from straight downwards is:
Angle from straight downwards = 90° - 63.4°
≈ 26.6°
So, the snowflake travels a total distance of approximately 4.49 ft at an angle of 28.6° from straight downwards.
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Transcranial magnetic stimulation (TMS) is a noninvasive technique used to stimulate regions of the human brain. A small coil is placed on the scalp, and a brief burst of current in the coil produces a rapidly changing magnetic field inside the brain. The induced emf can be sufficient to stimulate neuronal activity. One such device generates a magnetic field within the brain that rises from zero to 1.5 T in 120 ms. Determine the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field.
Answer:
0.125 volts
Explanation:
The induced emf can be sufficient to stimulate neuronal activity.
One such device generates a magnetic field within the brain that rises from zero to 1.5 T in 120 ms.
We need to find the induced emf within a circle of tissue of radius 1.6 mm and that is perpendicular to the direction of the field. The formula for the induced emf is given by :
[tex]\epsilon=-\dfrac{d\phi}{dt}[/tex]
Where
[tex]\phi[/tex] is magnetic flux
So,
[tex]\epsilon=-\dfrac{d(BA)}{dt}\\\\=2\pi r\times \dfrac{dB}{dt}\\\\=2\pi \times 1.6\times 10^{-3}\times \dfrac{1.5-0}{120\times 10^{-3}}\\\\=0.125\ V[/tex]
So, the induced emf is equal to 0.125 volts.
Which of the following is an inertial reference frame,
or at least a good approximation of one?
A. The inside of the orbiting International Space
Station.
B. A non-spinning ball following a projectile
motion trajectory.
C. An elevator accelerating downwards at 1g
D. All of the above
E. None of the above
A non-spinning ball following a projectile motion trajectory is an inertial reference frame,
Hence, the correct option is B.
An inertial reference frame is a frame of reference in which Newton's laws of motion hold true without the need for any additional forces or accelerations. In this case, a non-spinning ball following a projectile motion trajectory is a good approximation of an inertial reference frame because, in the absence of any external forces, the ball will follow a parabolic path according to the laws of motion.
A. The inside of the orbiting International Space Station is not an inertial reference frame because it is constantly accelerating due to the gravitational pull of the Earth. Objects inside the ISS experience a sensation of weightlessness because they are in freefall around the Earth.
C. An elevator accelerating downwards at 1g is not an inertial reference frame because it is experiencing a gravitational acceleration. Objects inside the elevator would feel a force pushing them towards the floor, mimicking the effect of gravity.
Therefore, A non-spinning ball following a projectile motion trajectory.
Hence, the correct option is B.
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Which two things might an object do when there are no forces acting on it?
Answer:
for one they will stay there. And another thing it will do is collect rust pretty much destroying it.
Explanation:
A point charge of -3.00 μC is located in the center of a spherical cavity of radius 6.90 cm inside an insulating spherical charged solid. The charge density in the solid is 7.35 × 10−4 C/m3.
Calculate the magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity.
The magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is 5.68 × 10⁴ N/C.
To calculate the electric field inside the solid at a given distance from the center of the cavity, we need to consider the contributions from both the point charge in the cavity and the charge density in the solid.
Let's break down the calculation step by step:
1. Electric field due to the point charge in the cavity:
The electric field at a point inside the solid due to the point charge in the cavity can be calculated using the formula:
E_point = k * |Q_point| / r²
where
E_point is the electric field due to the point charge,
k is the Coulomb's constant (8.99 × 10^9 N m²/C²),
|Q_point| is the magnitude of the point charge (-3.00 μC = -3.00 × 10⁻⁶C),
and r is the distance from the center of the cavity to the point inside the solid (9.50 cm = 0.095 m).
Substituting the values into the formula, we get:
E_point = (8.99 × 10⁹ N m²/C) * |-3.00 × 10⁶ C| / (0.095 m)²
E_point = 2.85 × 10⁷N/C
2. Electric field due to the charge density in the solid:
The electric field at a point inside the solid due to the charge density can be calculated using the formula:
E_density = (k * ρ * r) / (3ε0)
where
E_density is the electric field due to the charge density,
ρ is the charge density (7.35 × 10^(-4) C/m³),
r is the distance from the center of the cavity to the point inside the solid (9.50 cm = 0.095 m),
and ε0 is the permittivity of free space (8.85 × 10⁻¹² C²/N m²).
Substituting the values into the formula, we get:
E_density = [(8.99 × 10⁹N m²/C²) * (7.35 × 10⁻⁴C/m³) * (0.095 m)] / (3 * 8.85 × 10⁻¹² C²/N m²)
E_density = 1.06 × 10^8 N/C
3. Total electric field inside the solid:
To find the total electric field at the given point inside the solid, we need to sum the contributions from the point charge and the charge density. Since the charges have opposite signs, we subtract the magnitudes:
E_total = |E_point| - |E_density|
E_total = 2.85 × 10⁷N/C - 1.06 × 10⁸N/C
E_total = -7.78 × 10⁷N/C
However, the electric field is a vector quantity, and its direction is radial, pointing from the center of the cavity towards the point inside the solid.
Therefore, the magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is:
|E_total| = 7.78 × 10⁷N/C
The magnitude of the electric field inside the solid at a distance of 9.50 cm from the center of the cavity is 5.68 × 10
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What is the instantaneous velocity of the hummingbird at t=1s?
The distance - time graph of the humming bird is missing, so i have attached it.
Answer:
Instantaneous velocity = 0.5 m/s
Explanation:
From the attached graph, at time t = 1 s, the corresponding distance is 0.5 m.
Instantaneous velocity is the velocity at that point.
Thus;
Instantaneous velocity = 0.5/1
Instantaneous velocity = 0.5 m/s
If the elevation of the head of a stream is at 900 feet, and the elevation of the mouth of the stream is 500 feet, and the distance between the two points is 20 miles, and the meandering stream flows 25 miles between those points, what is the gradient of the stream?
Answer:
80 feet per mile
Explanation:
Given that a the elevation of the head of a stream is at 900 feet, and the elevation of the mouth of the stream is 500 feet, and the distance between the two points is 20 miles, and the meandering stream flows 25 miles between those points, what is the gradient of the stream?
The gradient will be calculated by using the formula
M = change in feet ÷ change in miles
Where
M = gradient of the stream.
Change in feet = 900 - 500 = 400 feet
Change in miles = 25 - 20 = 5 miles
M = 400 / 5
M = 80
Therefore, the gradient of the stream is 80 ft per mile
If the harmonic is 66 Hz, find the fundamental frequency
g since the acceleration ~a|| is constant in this scenario, which function will describe the shape of the position vs time graph?
The acceleration is constant in a scenario, the quadratic function f(x) = ax2 + bx + c will describe the shape of the position vs time graph.
When the acceleration, a||, is constant in a scenario, the function that describes the shape of the position vs time graph is the quadratic function.
The quadratic function is a function that is second-degree, which means that its highest power is 2, and it has the form of f(x) = ax2 + bx + c. A quadratic function is the function that best describes the position vs. time graph because it has a constant acceleration a and velocity v that increases linearly with time t, meaning that its position increases quadratically with time t.
Therefore, when the acceleration is constant in a scenario, the quadratic function will describe the shape of the position vs time graph.
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A uniform circular disk of radius R = 44 cm has a hole cut out of it with radius r = 13 cm. The edge of the hole touches the center of the circular disk. The disk has uniform area density σ.
Part (a) The vertical center of mass of the disk with hole will be located:
Part (b) The horizontal center of mass of the disk with hole will be located:
Part (c) Write a symbolic equation for the total mass of the disk with the hole.
Part (d) Write an equation for the horizontal center of mass of the disk with the hole as measured from the center of the disk.
Part (e) Calculate the numeric position of the center of mass of the disk with hole from the center of the disk in cm.
The vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.
Part (a) The vertical center of mass of the disk with the hole will be located at the same height as the center of the original disk, which is the same as the height of the center of the hole.
Therefore, the vertical center of mass of the disk with the hole is located at a distance of zero from the center of the disk.
Part (b) The horizontal center of mass of the disk with the hole will be located at the same horizontal position as the center of the original disk, since the hole is symmetrically placed with respect to the center.
Therefore, the horizontal center of mass of the disk with the hole is located at a distance of zero from the center of the disk.
Part (c) The total mass of the disk with the hole can be calculated by subtracting the mass of the removed portion (the hole) from the mass of the original disk.
The mass of the original disk is equal to its area multiplied by the area density, σ. The area of a circle is given by πR^2, so the mass of the original disk is πR^2σ.
The mass of the removed portion is equal to the area of the hole (πr^2) multiplied by the area density, σ. Therefore, the total mass of the disk with the hole is:
M = πR²σ - πr²σ
= σπ(R² - r²)
Part (d) The horizontal center of mass of the disk with the hole can be calculated using the concept of moments.
The moment of an infinitesimally small element of mass, dm, about a reference point is given by dm * r, where r is the perpendicular distance from the reference point to the element of mass.
To find the horizontal center of mass, we need to calculate the sum of these moments for all the infinitesimally small elements of mass in the disk and divide it by the total mass.
In this case, the reference point is the center of the disk. Since the hole is centered at the same point, the perpendicular distance, r, for all the elements of mass is zero.
Therefore, the moment for each element of mass is zero. As a result, the horizontal center of mass of the disk with the hole is also located at a distance of zero from the center of the disk.
Part (e) The center of mass of the disk with the hole coincides with the center of the disk in both the vertical and horizontal directions. Therefore, the position of the center of mass from the center of the disk is (0, 0) cm.
In conclusion, the vertical and horizontal centers of mass of the disk with the hole are both located at a distance of zero from the center of the disk.
The total mass of the disk with the hole can be expressed as M = σπ(R² - r²). The position of the center of mass from the center of the disk is (0, 0) cm.
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A box of mass 3.00 kg is accelerated from rest across a floor at a rate of 3.0 m/s^2 for 8.0 s. Find the net work done on the box.
The net work done on the box is 432 Joules. we can use the formula:
Net work = Change in kinetic energy.
To find the net work done on the box, we can use the formula:
Net work = Change in kinetic energy
The change in kinetic energy can be calculated using the formula:
Change in kinetic energy = (1/2) * mass * (final velocity^2 - initial velocity^2)
Given:
Mass of the box (m) = 3.00 kg
Acceleration (a) = 3.0 m/s^2
Time (t) = 8.0 s
Initial velocity (v₀) = 0 m/s (since the box starts from rest)
First, we can calculate the final velocity (v) using the kinematic equation:
v = v₀ + a * t
v = 0 + (3.0 m/s^2) * (8.0 s)
v = 24.0 m/s
Now we can calculate the change in kinetic energy:
Change in kinetic energy = (1/2) * m * (v^2 - v₀^2)
= (1/2) * (3.00 kg) * ((24.0 m/s)^2 - (0 m/s)^2)
= (1/2) * (3.00 kg) * (576 m^2/s^2)
= 432 J
Therefore, the net work done on the box is 432 Joules.
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phase difference formula
Answer:
Δx is the path difference between the two waves.
...
Phase Difference And Path Difference Equation.
Formula Unit
Phase Difference \Delta \phi=\frac{2\pi\Delta x}{\lambda } Radian or degree
Path Difference \Delta x=\frac{\lambda }{2\pi }\Delta \phi meter
above is the extended free body diagram of an object. which of the following forces would you need to exert at point a so that the object is in equilibrium? (hint: don't forget about rotation.)
To determine the force required at point A to achieve equilibrium, we need additional information about the forces acting on the object in the extended free body diagram.
Without that information, it is challenging to provide a specific answer. In order to achieve equilibrium, the sum of the forces acting on the object in both the horizontal and vertical directions should be zero. Additionally, the sum of the torques (rotational forces) acting on the object should also be zero. To find the force at point A, you would need to consider the magnitudes, directions, and positions of the other forces acting on the object. By applying the principles of static equilibrium, you can analyze the forces and torques acting on the object and calculate the force at point A required for equilibrium. It's important to note that equilibrium depends on the specific conditions and forces involved, such as the weight of the object, other external forces, and any constraints or supports present. Without more specific details or a visual representation of the forces in the extended free body diagram, it is difficult to provide a more precise answer.
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2. Why do you fall forward when you stub your toe on a chair? Explain in terms (meaning use
the words in the law in your answer) of inertia and Newton's llaw.
STUBBED
MY TOES
3. Why do you fly forward when hitting a curb while riding a skateboard or bike? Explain in
terms of inertia and Newton's 1" law.
4. Come up with your own example of Newton's first lawl Again explain using inertia and
Newton's l1st law
Answer:
because u feel pain and u get shaky and fall
Explanation:
Answer:
Explanation:because it hurts so you fall
the current in an rl circuit builds up to one-third of its steady-state value in 4.31 s. find the inductive time constant.
In this RL circuit, the inductive time constant is found to be approximately 12.93 seconds.
The inductive time constant of an RL circuit can be determined by analyzing the rate at which the current builds up to one-third of its steady-state value.
In an RL circuit, the rate at which the current builds up is determined by the inductive time constant (symbolized by the Greek letter tau, τ). The inductive time constant represents the time required for the current in the circuit to reach approximately 63.2% of its steady-state value.
Given that the current builds up to one-third (33.3%) of its steady-state value in 4.31 seconds, we can use this information to calculate the inductive time constant. We know that when the current reaches one-third of its steady-state value, it corresponds to approximately 33.3% of the difference between the initial current (at t=0) and the steady-state current.
Using this relationship, we can set up the equation:
33.3% = (1 - e^(-4.31/τ)) * 100%
Rearranging the equation and solving for τ, we find:
τ = -4.31 / ln(1 - 33.3%/100%)
Evaluating this expression gives us τ ≈ 12.93 seconds. Therefore, the inductive time constant of the RL circuit in question is approximately 12.93 seconds.
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q21: between thermal expansion and the input of freshwater (i.e., the melting of ice), what was the larger contributor to sea-level rise from 1993-2015? you might want to use a calculator for this.
Thus, we can conclude that during 1993-2015, thermal expansion contributed more to the sea-level rise compared to the input of freshwater (i.e., the melting of ice).
Between thermal expansion and the input of freshwater, the larger contributor to sea-level rise from 1993-2015 was thermal expansion. During the period from 1993 to 2015, the sea-level rise was measured at 3.4 millimeters per year. Melting of land ice such as ice sheets and glaciers contributed 1.2 millimeters per year of this sea-level rise. This means that thermal expansion contributed approximately 2.2 millimeters per year. Therefore, the larger contributor to sea-level rise from 1993-2015 was thermal expansion.
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why will a measuring stick placed along the circumference of a rotating disk appear contracted, but not if it is oriented along a radius? why will a measuring stick placed along the circumference of a rotating disk appear contracted, but not if it is oriented along a radius?
A measuring stick placed along the circumference of a rotating disk will appear contracted, but not if it is oriented along a radius because of the effects of length contraction, also known as Lorentz contraction, which is a consequence of special relativity.
The theory of special relativity postulates that a moving object appears shorter along its direction of motion than when it is at rest. The length of an object appears to contract in the direction of motion due to time dilation and length contraction. As a result, if the measuring stick is placed along the circumference of a rotating disk and is moving with the disk's motion, it will appear to be shorter or contracted. However, if it is oriented along a radius and is not moving with the disk's motion, it will not appear to be shorter or contracted. Length contraction and time dilation are two of the fundamental principles of special relativity, which helps to explain the strange and unexpected behaviors of objects at speeds approaching the speed of light.
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An airplane flies due north at 150 km/h relative to the air. There is a wind blowing at 125 km/h to the east relative to the ground. What is the direction plane's velocity relative to the ground?
a. 30 degrees with east.
b. 45 degrees with east.
C. 60 degrees with east.
d. Due east.
Hence, the direction of plane's velocity relative to the ground is at 34.08° with the East or 90 - 34.08 = 55.92° with the North. Thus, the correct option is D. Due East
The direction plane's velocity relative to the ground, The given data is: Airplane velocity relative to air = 150 km/h, Wind velocity = 125 km/h. Direction of wind velocity = East,
Using Pythagoras theorem, we can calculate the magnitude of the plane's velocity relative to the ground. Let Vp be the velocity of the plane relative to the ground and let theta be the angle between the velocity vector and the horizontal velocity vector (east).
Then the component of velocity of the plane in the East direction is given by
cos(theta) × Vp, and the component of velocity of the plane in the North direction is given by sin(theta) × Vp.
Using the given data and equation of relative velocity, the velocity of the plane with respect to the ground is:
Vp = √(150² + 125²) km/h
Vp= √(22500 + 15625) km/h
Vp= √(38125) km/h= 195.04 km/h.
So the speed of the airplane relative to the ground is 195.04 km/h.
We have to find out the direction plane's velocity relative to the ground. In order to find the direction of the plane's velocity relative to the ground, we have to find the angle of the plane's velocity relative to the East (horizontal) direction.
Using the components of velocity and taking the inverse tangent, we get:θ = tan⁻¹(sin⁻¹(125/195.04))= tan⁻¹(0.6414)= 34.08°
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Which of the following is a theory stating that one plate is forced beneath another plate?
(Choose one) :
1.) theory of Permian Extinction
2.) theory of plate tectonics
3.) theory of subduction
4.) theory of Pangaea
Answer:
theroy of plate tectonics
If the efficiency and mechanical advantage of a certain machine are given as 65 % and 3 respectively.What is the velocity ratio of the machine?
a.3.5 %
b.4.6 %
c.7.9 %
d.11.2 %
Answer:
b. 4.6 %
Explanation:
From the question,
E = M.A/V.R................ Equation 1
Where E = percentage Efficiency of the machine, M.A = machanical accurancy of the machine, V.R = Velocity ratio of the machine
Make V.R the subject of the equation
V.R = M.A/E
Given: M.A = 3, E = 65% = 0.65
Substitute this values into equation 2
V.R = 3/0.65
V.R = 4.6
Hence the right option is b. 4.6 $
A steam engine delivers 5.4×10^8 J of work per minute and services 3.6×10^9 J of heat per minute from its boiler.
i) What is the efficiency of the engine?
ii) How much heat is wasted per minute?
Work shown down.
The 15% is the efficiency and the energy wasted is the second part.
Sample of gas occupies 725 mL at 23°C 920 MMHG find the volume of the gas at standard temperature and pressure
Answer:
V2=809.44 mL
Explanation:
If ans is correct give a comment or ask for explanation with me .
A student sits in fixed position on a boat, holding an object with mass M. The student throws the object to the right with a speed V. While the object is in flight, the boat moves to the left, but at a speed much slower than object.
Assume the mass of the student+boat is >>> M, and that nay resistive forces between the boat and the water are negligible.
a) Explain the difference in speed
The difference in speed that occurs when a student sits in a fixed position on a boat and throws an object to the right with a velocity V while the boat moves to the left at a velocity that is much slower than the object's velocity can be explained as follows:
When the student throws the object to the right with a velocity V, the boat moves to the left due to the conservation of momentum. This movement of the boat to the left is very small, and its velocity is much slower than that of the object. When the object is in flight, the velocity of the student and the boat is the same as it was before the object was thrown to the right.The difference in speed between the boat and the object is due to the conservation of momentum. The boat and student move in the opposite direction with a velocity that is much smaller than that of the object.
The momentum of the object is equal to its mass multiplied by its velocity, and this momentum must be conserved. When the object is thrown to the right, the momentum of the object is transferred to the boat and the student.
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A hollow metal sphere has inner radius aa and outer radius b. The hollow sphere has charge +2Q. A point charge +Q sits at the center of the hollow sphere.
A. Determine the magnitude of the electric field in the region r≤a. Give your answer as a multiple of Q/ε0.
B. Determine the magnitude of the electric field in the region a
C. Determine the magnitude of the electric field in the region r≥b. Give your answer as a multiple of Q/ε0.
D. How much charge is on the inside surface of the hollow sphere? Give your answer as a multiple of Q.
E. How much charge is on the exterior surface? Give your answer as a multiple of Q.
A. The magnitude of the electric field in the region r ≤ a is zero.
B. The magnitude of the electric field in the region a < r < b is zero.
C. The magnitude of the electric field in the region r ≥ b is Q/ε₀, where ε₀ is the permittivity of free space.
D. The charge on the inside surface of the hollow sphere is +Q.
E. The charge on the exterior surface of the hollow sphere is +2Q.
A. To determine the magnitude of the electric field in the region r ≤ a (inside the hollow sphere), we need to consider the superposition of electric fields from the point charge at the center and the hollow sphere.
The electric field inside a conducting hollow sphere is zero. This means that the electric field due to the hollow sphere cancels out the electric field due to the point charge at the center.
Therefore, the magnitude of the electric field in the region r ≤ a is zero.
B. In the region a < r < b (between the inner and outer radii of the hollow sphere), the electric field is zero because the charge on the inner surface of the hollow sphere distributes itself uniformly on the inner surface, creating an electric field that cancels out the electric field from the point charge at the center.
Therefore, the magnitude of the electric field in the region a < r < b is zero.
C. In the region r ≥ b (outside the hollow sphere), we only have the electric field due to the point charge at the center. The magnitude of the electric field from a point charge is given by Coulomb's Law:
E = k * (|Q| / [tex]r^{2}[/tex]),
where E is the electric field, k is the electrostatic constant (k = 8.99 × [tex]10^{9}[/tex] N [tex]m^{2}[/tex]/[tex]C^{2}[/tex]), |Q| is the magnitude of the charge, and r is the distance from the point charge.
Substituting the given values:
E = k * (|Q| / [tex]r^{2}[/tex]),
= k * (Q / [tex]r^{2}[/tex]),
where we consider the magnitude of the charge |Q| = Q.
Therefore, the magnitude of the electric field in the region r ≥ b is Q/ε₀, where ε₀ is the permittivity of free space.
D. The charge on the inside surface of the hollow sphere is equal to the charge of the point charge at the center, +Q. This is because in electrostatic equilibrium, the charge resides on the outer surface of a conductor, and there is no electric field inside a conductor.
Therefore, the charge on the inside surface of the hollow sphere is +Q.
E. The charge on the exterior surface of the hollow sphere is equal to the charge of the hollow sphere, which is +2Q. This is because the charge on a hollow conductor resides entirely on its outer surface.
Therefore, the charge on the exterior surface of the hollow sphere is +2Q.
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How many calories are released when 6 grams of 100°C steam turns to 0°C ice?
Answer: 4276.2 calories
Explanation:
Given
mass of steam is 6 gm at [tex]100^{\circ}C[/tex]
Conversion of steam to ice involves
steam to water at [tex]100^{\circ}C[/tex]water at [tex]100^{\circ}C[/tex] to water at [tex]0^{\circ}C[/tex]water to the ice at [tex]0^{\circ}C[/tex]Calories released during the conversion of steam to water at [tex]100^{\circ}C[/tex]
[tex]E_1=mL_v\quad [L_v=\text{latent heat of vaporisation}]\\E_1=6\times 533=3198\ cal.[/tex]
Calories released during the conversion of water at [tex]100^{\circ}C[/tex] to water at [tex]0^{\circ}C[/tex]
[tex]E_2=mc(\Delta T)\quad [c=\text{specific heat of water,}1\ cal./gm.^{\circ}C]\\E_2=6\times 1\times 100=600\ cal.[/tex]
Calories released during the conversion of water to the ice at [tex]0^{\circ}C[/tex]
[tex]E_3=mL_f\quad [L_f=\text{latent heat of fusion}]\\E_3=6\times 79.7=478.2\ cal.[/tex]
The total energy released is
[tex]E=E_1+E_2+E_3\\E=3198+600+478.2=4276.2\ cal.[/tex]
a horizontal force pulls a 40- kg bag of fertilizer across the floor. what is the minimum force required if the coefficient of friction is 0.36?
Explanation:
You must overcome the force of friction for the bag to move
Normal force = mg = 40 * 9.81 =392.4 N
Normal force * coefficient = force of friction = 392.4 * .36 = 141.3 N
1. Which of the following gas with a molecules has highest translational K.E. at NTP i) Chlorine ii) oxygen iii) hydrogen iv) all have equal amount at ntp .
The correct answer is iii) hydrogen. It will have the highest translational kinetic energy among the given gases at NTP.
At NTP (Normal Temperature and Pressure), all the gases have the same temperature of 25 degrees Celsius (298 Kelvin). According to the kinetic theory of gases, the average translational kinetic energy of gas molecules is directly proportional to the temperature.
The formula for translational kinetic energy is given by:
K.E. = (3/2) k T
Where:
K.E. is the translational kinetic energy
k is the Boltzmann constant (1.38 × 10^-23 J/K)
T is the temperature in Kelvin
Since the temperature is the same for all the gases at NTP, the gas with the highest translational kinetic energy will be the one with the lightest molecules. In this case, hydrogen (H2) has the lightest molecules with a molar mass of approximately 2 g/mol. Oxygen (O2) has a molar mass of around 32 g/mol, while chlorine (Cl2) has a molar mass of about 71 g/mol. Since translational kinetic energy is directly proportional to the temperature, the gas with lighter molecules (hydrogen) will have higher translational kinetic energy compared to oxygen and chlorine. option(iii)
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What does a charged object experience as it is placed into an electric field?
Answer:
In an electric field a charged particle, or charged object, experiences a force. If the forces acting on any object are unbalanced, it will cause the object to accelerate. With this in mind: If two objects with the same charge are brought towards each other the force produced will be repulsive, it will push them apart.
Explanation:
A thin cylindrical shell is released from rest and rolls without slipping down an inclined ramp that makes an angle of 30° with the horizontal. How long does it take it to travel the first 3.1 m? A. 1.1 s
B) 1.8 s
C) 1.6 s
D) 1.4 s
E) 2.1 s
The thin cylindrical shell takes 1.4 seconds to travel the first 3.1 meters down the inclined ramp without slipping.
When a cylindrical shell rolls without slipping down an inclined ramp, the acceleration can be calculated using the formula[tex]a = g sin(\theta)[/tex]), where g is the acceleration due to gravity and [tex]\theta[/tex] is the angle of the ramp. In this case, [tex]g = 9.8 m/s^2[/tex] and [tex]\theta = 30^0[/tex].
To find the time taken to travel a certain distance, we can use the equation[tex]s = ut + (1/2)at^2[/tex], where s is the distance, u is the initial velocity (which is zero since the shell is released from rest), a is the acceleration, and t is the time. Rearranging the equation, we get [tex]t = \sqrt(2s/a)[/tex].
Plugging in the values, we have [tex]a = 9.8 m/s^2 sin(30^0)[/tex] and s = 3.1 m. Calculating the values, we find [tex]a = 4.9 m/s^2[/tex] and t ≈ 1.4 s. Therefore, the correct answer is D) 1.4 s.
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