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प्रश्न
State the energy changes which take place when:
Water freezes 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.
संबंधित प्रश्न
Give one example of a body that has potential energy, in due to its state.
Two toy-cars A and B of masses 500 g and 200 g respectively are moving with the same speed. Which of the two has the greater kinetic energy?
A body of mass 5 kg falls from a height of 10 m to 4 m. Calculate:
The total energy possessed by the body at any instant? (Take g = 10 ms-2).
What do you understand by mechanical energy?
Is it possible that a body may possess energy even when it is not in motion?
State the energy changes which take place when:
Photographic film is exposed to sunlight.
Show that in case of a body falling freely under gravity, total mechanical energy remains conserved (neglect air resistance).
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)
The solar cooker is an application of the ______ energy of the sun, while solar cells, solar lamps are applications of the ______ energy of the sun.
