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प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the Explosion of crackers.
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उत्तर
Chemical energy changes into heat, light and sound energy.
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संबंधित प्रश्न
State the energy changes in the following while in use A loudspeaker .
State the energy changes in the following while using a microphone.
State the energy changes in the following while using an electric motor.
Fill in the blank
Green plants convert _________ energy into chemical energy.
State the energy changes that occur in the following :
The unwinding of a watch spring.
State the energy changes in the following case while in use:
a steam engine
Is it possible that an object is in a state of accelerated motion due to external force acting on it, but no work is being done by the force? Explain it with an example.
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
(a) How much work is done by the men in lifting the box?
(b) How much work do they do in just holding it?
(c) Why do they get tired while holding it? (g = 10 m s–2)
State the energy changes in the following case while in use:
An electric cell in a circuit
In an electric cell while in use, the change in energy is from ______.
