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प्रश्न
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
पर्याय
Yes
No
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उत्तर
No
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संबंधित प्रश्न
Power spent by a body depends on the time for which it does work.
Work done = Force × ........................................
Name the forms of energy which a wound-up watch spring possesses.
A vessel containing 50 kg of water is placed at a height 15 m above the ground. Assuming the gravitational potential energy at ground to be zero, what will be the gravitational potential energy of water in the vessel? (g = 10 m s-2)
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
Give an example
Electrical energy changes to heat energy.
