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A boy exerts a force of 210 N on a lever to raise a 1.25 103 N rock a distance of 12 cm. If the efficiency of the lever is 88.7%, how far did the boy move his end of the lever?
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PhysicsCrazy<3

  • physics -

    Work done on the rock will be 87% of the work performed by the boy.
    210N*X = 0.87*1250N*0.12m
    Solve for X

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