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प्रश्न
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उत्तर
'Work' is said to be done when the applied force makes the body move i.e., there is a displacement of body.
It is equal to the product of force and the displacement of the point of application of the force in the direction of force.
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संबंधित प्रश्न
Work done = Force × ........................................
A boy of mass 40 kg climbs up the stairs and reaches the roof at a height 8 m in 5 s. Calculate:
- the force of gravity acting on the boy,
- the work done by him against the force of gravity,
- the power spent by boy. (Take g = 10 m s-2)
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)
MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
In case of negative work, the angle between the force and displacement is :
How many joules are there in 1 mega joule?
Give an example
Chemical energy changes to electrical energy.
