What Is the Maximum Angle Before Slipping on an Inclined Plane?

[sinjid9]

Homework Statement

If mu = 0.2 find the maximum angle before slipping occurs
Diagram: A ramp in the shape of a right triangle that is 30 degrees above the horizontal. A mass is on the ramp and tied to it is a string that runs around the ramp to the vertical side of the ramp where another mass is held in the air.

Homework Equations

F(net)=ma
F(friction)=(mu)*(Normal Force)

The Attempt at a Solution

F(friction) = 0.2*(Normal Force)
F(net) = 0
F(friction)-(Fgravitytan(theta))=0
0.2F(gravity) - (Fgravitytan(theta)) = 0

 

[Spinnor]

Do you have something like this?