An engine pumps water through a hose pipe. Water passes, through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg//m. What is the power of the engine ?

An engine pumps water through a hose pipe. Water passes, through the p

1.	An engine pumps water through a hose pipe. Water passes, through the pipe and leaves it with a velocity of 2 m/s. The mass per unit length of water in the pipe is 100 kg//m. What is the power of the engine ?
Answer» 400 W 200 W 100 W 800 W Solution :Here, Mass per unit LENGTH of WATER, `mu = 100 kg//m` Velocity of water, `v = 2 m//s` Power of the engine, `P = mu v^3` `= (100 kg//m) (2 m//s)^3 = 800 W`.