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प्रश्न
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संबंधित प्रश्न
The S.I. unit of energy is .............
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
Ravi applied a force of 10 N and moved a book 30 cm in the direction of the force. How much was the work done by Ravi?
What do you mean by a kilo joule?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
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.
