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प्रश्न
State the energy changes that occur in the following :
The unwinding of a watch spring.
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उत्तर
Potential energy to kinetic energy.
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संबंधित प्रश्न
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the unwinding of a watch spring.
State the energy changes in the following case while in use:
A solar cell
Explain conservation of energy.
Law of conversation of energy given by ______.
A boy is moving on a straight road against a frictional force of 5 N. After travelling a distance of 1.5 km he forgot the correct path at a roundabout (Fig. 11.1) of radius 100 m. However, he moves on the circular path for one and half-cycle and then he moves forward up to 2.0 km. Calculate the work done by him.
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)
The energy conversion in a washing machine is from ______.
For burning of coal in a thermoelectric station, the energy conversion taking place is:
State the energy changes in the following case while in use:
An electric cell in a circuit
