The figure shows a wheel on a slope with inclination angle 16 degrees, where the coefficient of friction is adequate to prevent the wheel from slipping; however, it might still roll. The wheel is a uniform disk of mass 1.35 kg, and it is weighted at one point on the rim with an additional 0.960 kg mass. Find the angle PHI shown in the figure such that the wheel will be in static equilibrium. http://img181.imageshack.us/img181/9085/rw1261xj2.jpg [Broken] http://g.imageshack.us/img181/rw1261xj2.jpg/1/ [Broken] I understand this: m sin(phi) R = M sin(theta) R However, this does not give me the right answer. So how do I solve this?