Hi, Im having a tough time with this problem that my teacher gave me to do. I was wondering if someone could help me solve it or get me on the right track.
A 10.2kg crate is on a ramp with an incline of 15 degress to the horizontal. In order to keep the crate from sliding down a rope is attached to the crate. The rope is applying a force of 10.3 N that acts 40 degrees to the ramp. Determine the magnitude of the force of friction. HAVE TO USE THIS FORMULA TO SOLVE THIS PROBLEM NO COMPONENTS OR PROJECTIONS! sin(A-B)=sinAcosB-sinBcosA