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Work done by a boy depends on the time in which he does work.
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)
Explain by an example that a body may possess energy even when it is not in motion.
What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
What is the ratio of SI units to CGS units of 'work'?
A bullet is of mass 'm' g and is moving with a velocity 'v' m/s. Find the kinetic energy of the bullet when
(a) The mass is doubled,
(b) The velocity is tripled.
Calculate the work done when:
A 5 kg weight is lifted 10 m vertically. (g = 9.8 m/s2)
A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is ______.
