A pump motor is used to deliver water at a certain rate from a given pipe. To obtain 'n' times water from the same pipe in the same time by what amount (a) the force and (b) power of the motor should be increased ?

Options

A. 16 times
B. 4 times
C. 8 times
D. 2 times

Answer

C

Explanation

Power of a pump `=(1)/(2) rho Av^(3)`
To get twice amount of water from same pipe v has to be made twice. So power is to be made 8 times