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प्रश्न
Give an example
Chemical energy changes to electrical energy.
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उत्तर
Dry cell
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संबंधित प्रश्न
Write an expression for the work done when a force is acting on an object in the direction of its displacement.
A boy does work when he pushes against a brick wall. (yes/no).
What is the work done when the object acted upon by a force remains at rest?
A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?
What do you mean by a kilo joule?
A cricket ball is thrown up from the earth's surface. What happens to its P.E.
(a) during the motion
(b) at the highest point?
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
