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प्रश्न
State the law of conservation of energy.
उत्तर
The Law of conservation of energy states that energy Can neither be created nor be destroyed. One form of energy is converted into another form of energy.
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संबंधित प्रश्न
State the energy changes in the following case while in use:
An electric iron
State the energy changes in the following case while in use:
A ceiling fan
State the energy changes in the following while using a microphone.
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.
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:
An electromagnet.
What is law of conservation of energy?
Can any object have momentum even if its mechanical energy is zero? Explain
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)
