- #1

Medgirl314

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## Homework Statement

Two men loading a 900 kg piano onto a truck lose control and the piano slips, rolling down the loading ramp. The ramp is a 12 degree incline that is 3.2m long. If the piano accelerates down the ramp at 0.4m/s^2, find the coefficient of rolling friction.

## Homework Equations

F=ma

## The Attempt at a Solution

a=g(cos)(theta)-(mu)g(sin)(theta

mu=g(cos)(theta)=9.8(cos12)+0.4

mu=9.9

This looks wrong. Where did I mess up?

Thanks!