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प्रश्न
उत्तर
Work
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संबंधित प्रश्न
Define work.
A man lifts a mass of 20 kg to a height of 2.5 m. Assuming that the force of gravity on 1 kg mass is 10 N, find the work done by the man.
.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
State two advantage of producing hydroelectricity.
What do you mean by degradation of energy?
Fill in the blank with suitable word :
1 joule is the work done when a force of 1 __________ moves an object through a distance of one __________ in the direction of __________.
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
Draw a neat labeled diagram to show the direction of two forces acting on a body to produce rotation in it. Also mark the point about which rotation takes place.
Is work done a scalar or a vector physical quantity?
Write an expression for the work done against gravity.
If a ball is dropped on the sloping roof of a house, it acquires ______ and falls on the ground. That is the transformation of ______ energy into ______ energy takes place.
(kinetic, potential, motion)
Work done by this force at any instant is ______.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
