(Solved): A motor drives a pump via a shaft. The motor draws 5 amps at 110 volts and has an efficiency of \( ...

A motor drives a pump via a shaft. The motor draws 5 amps at 110 volts and has an efficiency of \( 90 \% \). The pump has a mechanical efficiency of \( 80 \% \) (the remaining \( 20 \% \) is lost as heat to the surroundings). Water at \( 25^{\circ} \mathrm{C} \) enters the pump at \( 3 \mathrm{~kg} / \mathrm{s} \). Assume the outlet water temperature is also \( 25^{\circ} \mathrm{C} \). The pump inlet and outlet are both 2 -inch diameter pipe. Potential energy changes are negligible. Determine the change in pressure from pump inlet to outlet.