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## Homework Statement

You are pushing a 53 kg crate at a constant velocity up a ramp onto a truck. The ramp makes an angle of 22 degrees with the horizontal. If your applied force is 373 N, what is the coefficient of friction between the crate and the ramp?

## Homework Equations

μ = F

_{f}/F

_{n}

F

_{n}= m X g X cos θ

F

_{net}= F

_{a}– mg sin θ +or- μmg cos θ

## The Attempt at a Solution

F

_{n}= 53 X 9.81 X cos 22

F

_{net}= 373 – 53 X 9.81 sin 22 + μ X 53 X 9.81 cos 22

The book's answer is 0.37 but I just can't get the rest of the equation. Any suggestions are appreciated.