Question $4$

Oil, with $sg=0\mathrm{.}87,$ flows from a tank pressurized at $130$ kPa at a rate of $72\frac{L}{s}$ and

powers a fluid motor as shown. Energy losses due to friction and fittings between the

tank and $B$ are estimated to be $1\mathrm{.}81$ m $.$

If the pressure at B is found to be $-56$ kPa and the motor has an efficiency of $78\%,$

determine the power output from the motor.