Eben lifts an engine out of his Volkswagen with the help of a winch that...

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...allows him to raise the engine 0.020? Eben lifts an engine out of his Volkswagen with the help of a winch that allows him to raise the engine 0.020 m for every 0.90 m he pulls on the cable. Eben expends 1000. J of energy to lift the 800.-N engine 0.50 m. a) What is the efficiency of the winch? b) What is the ideal mechanical advantage of the winch? c) What. is the actual mechanical advantage of the winch? d) What force does Eben exert to lift the engine?
 
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