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प्रश्न
State the energy changes that occur in the following :
Burning coal while operating a steam engine.
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उत्तर
Chemical energy of coal changes to heat energy of the steam. Heat energy changes into mechanical energy.
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संबंधित प्रश्न
State the energy changes in the following while in use An electric bulb.
State the energy changes in the following while using an electric motor.
State the energy changes that occur in the following :
The unwinding of a watch spring.
State the energy changes that occur in the following :
Lighting of a torch bulb.
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.
State the energy changes in the following case while in use:
Washing machine
Choose the odd one:
Avinash can run with a speed of 8 m s–1 against the frictional force of 10 N, and Kapil can move with a speed of 3 m s–1 against the frictional force of 25 N. Who is more powerful and why?
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 ______.
