A motor is used to deliver water at a certain rate through a given horizontal pipe. To deliver n-time the water through the same pipe in the same time the power of the motor must be increased as follows
A
n times
B
times
C
times
D
times
Text Solution
Verified by ExpertsThe correct answer is:
C
If the motor pumps water (density 
) continuously through a pipe of area of cross-section A with velocity v, then mass flowing out per second.
…(i)
Rate of increase of kinetic energy
…(ii)
Mass m, flowing out per sec, can be increased to 
by increasing v to 
, then power increases from P to 
.
Now, 
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