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प्रश्न
Is power a scalar quantity?
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उत्तर
Yes, power is a scalar quantity.
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संबंधित प्रश्न
The S.I. unit of work is
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.
What do you mean by degradation of energy?
Fill in the blank with suitable word :
Work is measured as a product of __________ and __________
A machine raises a load of 750 N through a height of 16 m in 5s. calculate:
(i) work done by machine,
(ii) power at which the machine works.
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.
Give an example
Electrical energy changes to heat energy.
Name the material commonly used for the manufacturing of solar cells.
