PHYSICS A pulley system is used to lift a piano 3.1 m.The acceleration of gravity is 9.81 m/s?

A pulley system is used to lift a piano 3.1 m.

The acceleration of gravity is 9.81 m/s

2

.

If a force of 2255 N is applied to the rope

as the rope is pulled in 19 m, what is the

efficiency of the machine? Assume the mass

of the piano is 735 kg.

Answer in units of %.

1 Answer

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  • Anonymous
    1 month ago

    Theoretical work needed = mass of piano * g * vertical height.

    Work = force * distance = 2255 N * 19 m = actual work you exerted in J.

    Small number divided by big number multiplied by 100 = efficiency.

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