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प्रश्न
The S.I. unit of energy is .............
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उत्तर
The S.I. unit of energy is joule.
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संबंधित प्रश्न
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Soni says that the acceleration in an object could be zero even when several forces are acting on it. Do you agree with her? Why?
The moon is revolving around the earth in a circular path. How much work is done by the moon?
A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:
- the work done, and
- the power developed by them. Take g = 10 N kg-1.
Give one example in which a force does zero work.
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
Give an example
Light energy changes to electrical energy.
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
