Questions in Work, Energy and Power

Select	Question
	The power of pump, which can pump 200 kg of water to a height of 50 m in 10 sec, will be
	From an automatic gun a man fires 360 bullet per minute with a speed of 360 km/hour. If each weighs 20 g, the power of the gun is
	An engine pump is used to pump a liquid of density $\rho$ continuously through a pipe of cross-sectional area A. If the speed of flow of the liquid in the pipe is v, then the rate at which kinetic energy is being imparted to the liquid is
	If the heart pushes 1 cc of blood in one second under pressure 20000 N/m2 the power of heart is
	A man does a given amount of work in 10 sec. Another man does the same amount of work in 20 sec. The ratio of the output power of first man to the second man is
	The coefficient of restitution e for a perfectly elastic collision is
	The principle of conservation of linear momentum can be strictly applied during a collision between two particles provided the time of impact is
	A shell initially at rest explodes into two pieces of equal mass, then the two pieces will
	A sphere of mass m moving with a constant velocity u hits another stationary sphere of the same mass. If e is the coefficient of restitution, then the ratio of the velocity of two spheres after collision will be
	Two solid rubber balls A and B having masses 200 and 400 gm respectively are moving in opposite directions with velocity of A equal to 0.3 m/s. After collision the two balls come to rest, then the velocity of B is