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प्रश्न
State the energy changes which take place when:
Water freezes in the freezing chamber of a fridge.
State the energy changes taking place in following case:
Freezing of water in the freezing chamber of a fridge.
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उत्तर
The kinetic energy of water molecules is released in the form of heat energy.
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संबंधित प्रश्न
State the energy changes in the following case while in use:
an electric cell in a circuit
Select the renewable and non-renewable sources of energy from the following:
Coal
Select the renewable and non-renewable sources of energy from the following:
Wood
A pebble is thrown up. It goes to a height and then comes back on the ground. State the different changes in form of energy during its motion.
Obtain an expression for the potential energy of a body of mass m at a height h above the ground.
State the energy changes which take place when:
Photographic film is exposed to sunlight.
Give one example when:
Sound energy changes to electric energy.
Give one example when:
Mechanical energy to heat energy.
A ball of mass 50 g falls from a height of 2m and rebounds from the ground to 1.6 m. Find:
(i) The potential energy possessed by the ball when initially at rest.
(ii) The kinetic energy of the ball before it hits the ground.
(iii) The final potential energy of the ball.
(iv) The loss in kinetic energy of the ball on collision. (Take: g = 10N kg−1)
Can you tell?
Describe one natural chain of transformation of energy.
