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## Homework Statement

A washing machine that weighs 1400N must be put into a delivery truck bed that is 1.2 m off the ground. A worker uses a force of 450N to push the machine up a ramp that is 4.3m long. What is the efficiency of the inclined plane?

## Homework Equations

e=(MA/IMA)100---- efficiency of a machien in % is = to its mechanical advantage, divided by the ideal mechanical advantage, multiplied by 100.

MA=Fr/Fe---- mechanical advantage=the resistance of force divided by the effort force.

IMA=De/Dr----the ideal mechanical advantage of an ideal machien is=to the displacement of the effort force, divided by the displacement of the load.

## The Attempt at a Solution

MA=1400N/450N=3.11N, I think i did that part right.

IMA=1.2m/4.3m=0.28m, I think i did this part wrong.

e=(3.11N/0.28m)100=1110.71joules.

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