Question

a mechanic uses a chain and bloc pulley to lift a 875-kg engine 4.0 m to the top of the garage. the downward force on the chain over the 4.0 m distance is 5.0 x 10^4 N.

a)calculate the work done in raseing the motor
b)how much useful work was done
c)what is the inefficiency of the chain and block pulley in raising the motor

Jan 12, 2013

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