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प्रश्न
What is the work done by the moon when it revolves around the earth?
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उत्तर
Work done = Force × Displacement
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MULTIPLE CHOICE TYPE
In an electric cell which in use, the change in energy is from:
The work done by a force acting obliquely is given by the formula : W = F cos θ ✕ s. What will happen to the work done if angle θ between the direction of force and motion of the body is increased gradually? Will it increase, decrease or remain constant.
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
