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प्रश्न
State the S.I. unit of energy.
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उत्तर
S.I. unit of energy Joule (J).
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संबंधित प्रश्न
Differentiate between energy and power.
.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.
Explain degradation of energy by taking two examples of your daily life.
Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.
Give one example each in which a force does (a) positive work (b) negative work, and (c) zero work.
A person of mass 50 kg climbs a tower of height 72 metres. Calculate the work done. (g = 9.8 m s−2).
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
State the conditions of equilibrium for a rigid body.
A boy does work when he pushes against a brick wall. (yes/no).
State the energy changes which take place when Water stored in the dam is used to turn turbine in dynamo.
Name the material commonly used for the manufacturing of solar cells.
Name two places in India where electricity is generated from nuclear power plants.
Mention whether work is done or not in the following activity.
| S. No | Activity | Work done or not done |
| 1. | Pushing the door | |
| 2. | Holding a doll | |
| 3. | Sitting in a bus | |
| 4. | Pushing a wall | |
| 5. | Digging soil |
What is work?
