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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
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Power spent by a body depends on the time for which it does work.
Work done = Force × ........................................
How is work related to energy?
State the law of conservation of energy.
What do you mean by degradation of energy?
What is the condition for a force to do work on a body?
A body does 20 J of work in 10 s. What is its power?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
A block of mass 20 kg is pulled up a slope (fig.12) with a constant speed by applying a force of 500 N parallel to the slope. A and B are initial and final positions of the block.
(a) Calculate the work done by the force in moving the block from A and B.
(b) Calculate the potential energy gained by the block.
