1.

A pump motor is used to deliver water at a certain rate from a given pipe. To obtain 'n'timeswater from the same pipe in the same time the amount by which the power of the motor should beincreased -(A) n12(B) n2(C) n3(D) n

Answer»

power = F.v

v has to be increased by n

oppossing force is proportional to v^2

totally n^3



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