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प्रश्न
What is the SI unit of work?
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उत्तर
Joule
APPEARS IN
संबंधित प्रश्न
Define work.
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.
Define the term energy.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
What are the units of (a) work, and (b) energy?
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Name the type of energy possessed by a
(i) stretched catapult (ii) hot iron
(iii) wound up clock
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Give an example
Electrical energy changes of sound energy.
A bucketful of water is to be drawn from a well ______ will be done when a ______ is applied to do this because there will be a ______ of water.
(displacement, work, force)
