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Define momentum. State its S.I. unit. An object of mass 50 kg. is accelerated uniformly from a velocity of 4ms⁻¹ to 8ms⁻¹ in 8s. Calculate the initial and final momentum of the object. Also find the magnitude of the force exerted on the object.
State the law of conservation of momentum. Why is a person hit harder when he falls on a hard floor than when he falls on sand from the same height? A bullet of mass 20g is fired horizontally with a velocity 100ms⁻¹ from a pistol of mass 1.5 kg. Calculate the recoil velocity of the pistol.
Define power. How will you differentiate between kW and kW h? If the velocity of a ball is tripled, what will be the ratio of
Four men lift a 250 kg box to a height of 1 m and hold it without raising or lowering it.
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to
Suppose a ball of mass m is thrown vertically upward with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed v again before striking the ground. It implies that the magnitude of initial and final momentums of the ball are same. Yet, it is not an example of conservation of momentum. Explain why?
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