If a force moves an object from rest to reach a velocity , calculate the power.

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Understanding the concept of power

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Amana RangarajanLv9

3 Dec 2020

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At the instant the displacement of a 2.00 kg object relative to theorigin is d = (2.00 m)i + (4.00 m)j - (3.00 m)k, its velocity is v= (6.99 m/s)i + (3.66 m/s)j + (8.14 m/s)k and it is subject to aforce F = (9.02 N)i - (3.34 N)j + (9.52 N)k. Find the accelerationof the object ((a), (b) and (c) for i, j and k componentsrespectively), the angular momentum of the object about the origin((d), (e) and (f) for i, j and k components respectively), thetorque about the origin acting on the object ((g), (h) and (i) fori, j and k components respectively), and (j) the angle between thevelocity of the object and the force acting on the object.

1. Can work be done on a system if there is no motion?

A) Yes, if an outside force is provided B) Yes, since motion is only relative C) No, since a system which is not moving has no energy D) No, because of the way work is defined

2. The quantity 1/2 mv 2 is

A) the power supplied to the object by the force B) the work done on the object by the force C) the kinetic energy of the object. D) the potential energy of the object.

3. If you push twice as hard against a stationary brick wall, the amount of work you do

A) doubles. B) is cut in half C) remains constant but non-zero D) remains constant at zero

4. If the net work done on an object is positive, then the object's kinetic energy

A) increases. B) decreases C) remains the same D) is zero

5 A force of 20 N moves an object in the direction of the force. The work done when the object moves from 2.0 to 4.0 m is o A) 20 J OB) 40 J oC) 60 J D) 80 J

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A 5-kg object, initially at rest, moves under the action of a force according to the force-displacement graph given below. Find its velocity when it crosses 8 m.

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If a force moves an object from rest to reach a velocity , calculate the power.

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Physics: Principles with Applications

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