Work Energy And Power Question 195

Question: A pump motor is used to deliver water at a certain rate from a given pipe. To obtain twice as much water from the same pipe in the same time, power of the motor has to be increased to [JIPMER 2002]

Options:

A) 16 times

B) 4 times

C) 8 times

D) 2 times

Show Answer

Answer:

Correct Answer: C

Solution:

Power of a pump $ =\frac{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.



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