## greenday101 3 years ago A 25 kg box rests without sliding on a loading ramp at an angle of 30 degrees. What is the coefficient of friction between the box and the ramp? I know the answer is .58 but I'm not sure how to do this.

1. elica85

$F _{static}=\mu mg$ on a horizontal surface

2. elica85

on an angle... $F _{static}=\mu mgcos \Theta$ not sure where to go from here without additional info. nothing else was given?

3. greenday101

I figured it out. tanΘ=tan(30)=.577

4. elica85

0_o huh