A pumping machine pumps a liquid at a rate of 60 cc per minute at a pressure of 1.5 atmosphere

A pumping machine pumps a liquid at a rate of 60 cc per minute at a pressure of 1.5 atmosphere. The power of the machine is
(A) 9 watts
(B) 6 watts
(C ) 9 kW
(D) None of these

Solution : Power = F.v , where F = force imparted by the machine , v = velocity of the liquid
P = p.A.v, Where p = pressure & A = effective area
= p dV/dt
= (1.5×105 N/m2)(60 ×10-6 N/m2)
( 1 atm ≈ 105 N/m2 )
= 9 watts

Author: Rajesh Jha

QuantumStudy.com for CBSE|IIT-JEE|NEET

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