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प्रश्न
The moon is revolving around the earth in a circular path. How much work is done by the moon?
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उत्तर
Work done by the moon is zero as the force of attraction on the moon by the earth is normal to the direction of motion of the moon.
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संबंधित प्रश्न
In which of the following cases, is work being done?
(i) A man pushing a wall.
(ii) a coolie standing with a load of 12 kgf on his head.
(iii) A boy climbing up a staircase.
What are the units of (a) work, and (b) energy?
Write an expression for work done by a force depends?
Is power a scalar quantity?
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?
Name the physical quantity associated with the 'rate of doing work'.
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
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The work done by the heart is 1 Joule per beat. Calculate the power of the heart if it beats 72 times in one.
