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प्रश्न
Name the quality which is measured in Wh.
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उत्तर
Energy is measured in Wh
संबंधित प्रश्न
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
In which one of the following cases is the work done more? When the angle between the direction of motion and that of the force is (i) 90° (ii) 0°.
Give the units of couple.
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
State the S.I. and C.G.S. units of energy. How are they related?
The world record for weight lifting was held by Sergei Didyk of the USSR. He lifted 261 kg to a height of 2.3 m in 4s; find:
(a) Weight lifted by him
(b) Work done by him
(c) Power developed by him. (g = 10m/s2)
For the following scenario, state whether the work done by gravity is positive, negative, or zero.
A person climbs a ladder.
A man raises a box of mass 50 kg to a height of 2 m in 20 s, while another man raises the same box to the same height in 50 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1
