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Answer to Question #5282 in Mechanics | Relativity for katherine

Question #5282
Robbie is playing pioneer and pumping water from a well with a hand pump. Each pump moves 12.2 kg of water for 10 seconds of pumping. Robbie must supply an average force of 155 N to move the handle of the pump 0.56m each pump. If the pump moves the water a height of 5.6 m, find the efficiency of the pump
Expert's answer

A(what was done by Robbie)=F*L*n=155*0.56*10=868N
Where F-forse,& L- the handle of the pump 0.56m each pump, n-10 times
A(useful work)=mgh=12.2*5.6*10=683

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