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प्रश्न
Give an example
Chemical energy changes to electrical energy.
उत्तर
Dry cell
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संबंधित प्रश्न
No work is done by a force if the body
The moon is revolving around the earth in a circular path. How much work is done by the moon?
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B does the same in 15 s. Compare the Work done.
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The SI unit of work is ....... and of power is .......
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Joule is the unit of .......
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Fill in the boxe to show the corresponding energy transformation.
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In the following case write yes, if the work is being done and no if no work is being done.
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Name the material commonly used for the manufacturing of solar cells.
A girl of mass 40 kg runs a height of 80 stairs, each 25 cm high with a load of 20 kg on her head in 25 sec. If g is 10 m/s2, find:
(i) Gravitational force acting on the girl.
(ii) Work done by her.
(iii) Useful work done by her.
(iv) Her power in watt.
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State whether work is done or not, by writing yes or no, in the following case:
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