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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 unwinding of a watch spring.
उत्तर
The hands of a watch use the elastic potential energy saved during the unwinding of a clock. The potential energy of a wound-up spring converts into kinetic energy.
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संबंधित प्रश्न
State the energy changes that occur in a watch spring while it unwinds.
State the energy changes in the following while using an electric motor.
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.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in respiration.
Energy can exist in several forms and may change from one form to another. State the energy changes that occur in the burning of a match stick.
State the energy changes in the following case while in use:
loudspeaker
Choose the odd one:
The power of a motor pump is 2 kW. How much water per. the minute the pump can raise to a height of 10 m? (Given g = 10m s−2)
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)
