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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 a loaded truck when started and set in motion.
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उत्तर
The chemical energy of petrol or diesel is converted into mechanical energy (kinetic energy).
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संबंधित प्रश्न
State the energy changes that occur in a watch spring while it unwinds.
Fill in the blank
Green plants convert _________ energy into chemical energy.
State the energy changes that occur in the following :
An electric generator (or dynamo).
State the energy changes in the following case while in use:
Bio-gas burner
A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground. What happens to the mechanical energy after the ball hits the ground and comes to rest?
Can any object have mechanical energy even if its momentum is zero? Explain.
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.
A light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has larger kinetic energy?
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)
In an electric cell while in use, the change in energy is from ______.
