Question 1:
difficult
A pump motor is used to deliver water at a certain rate from a given pipe. To obtain “2” time water from the same pipe in the same time, the amount to which the power of the motor should be increased is :
Force on water coming out is F= ρAv² and Power P=F.v
So, Power = F.v= ρAv³,
if v becomes 2v, Power P1= 8P