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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 coolie does no work against the force of gravity while carrying a luggage on a road.
How much energy is gained by a box of mass 20 kg when a man, carrying the box waits for 5 minutes for a bus?
How much work is done when a force of 2 N moves a body through a distance of 10 cm in the direction of force?
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
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.
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
How is horse power related to the S. I. unit of power?
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.
