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Question
State the energy changes which take place when:
Burning of coal.
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Solution
The chemical energy changes into heat energy.
RELATED QUESTIONS
Fill in the blank
Energy possessed by a compressed spring is ______ energy.
State the energy changes in the following case while in use:
an electric bulb
State two uses of solar cells.
State two disadvantages of using nuclear energy for producing electricity.
State four ways for the judicious use of energy.
Renewable source of energy is:
Is it possible that a body may possess energy even when it is not in motion?
Give three examples of bodies possessing potential 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)
