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प्रश्न
Name the form of energy which a body may possess even when it is not in motion. Give an example to support your answer.
उत्तर
Even when the body is not in motion, it has potential energy. For example, a stone at a certain height has gravitational potential energy due to its raised position.
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संबंधित प्रश्न
State the energy change in the following device while in use:
A glowing electric bulb.
State the energy changes in the following case while in use:
an electric bulb
State two disadvantages of using nuclear energy for producing electricity.
A hydroelectric power station takes its water from a lake whose water level is 50 m above the turbine. Assuming an overall efficiency of 40%, calculate the mass of water which must flow through the turbine each second to produce power output of 1 MW. (Take g = 10 m s-2)
A ball of mass 0.5 kg slows down from a speed of 5m/s-1 to that of 3m/s-1. Calculate the change in kinetic energy of the ball.
What do you understand by the potential energy of the body?
State two advantages and disadvantages of using wind energy for producing electricity.
State the energy changes which take place when:
A body thrown vertically upwards from the ground.
State the energy changes which take place when:
Photographic film is exposed to sunlight.
Match the pairs.
| Group 'A' | Group 'B' | ||
| (1) | Rolling object | (a) | Heat energy |
| (2) | Food | (b) | Atomic energy |
| (3) | Stretched bow | (c) | Kinetic energy |
| (4) | Sunlight | (d) | Potential energy |
| (5) | Uranium |
(e)
|
Chemical energy
|
