Homework Help: physics

Posted by PhysicsCrazy<3 on Friday, March 2, 2012 at 5:54pm.

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?
Thanks for all your help :)
<3,
PhysicsCrazy<3

physics - drwls, Friday, March 2, 2012 at 6:17pm
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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