Alan is using the equation mg sin A = umg cos A to determine the coefficient of friction, u, between a flat rock and a metal ramp. Find u to the nearest hundredth, if the rock begins to slide at 19º.

Answer 1

mg*sin19 = u*mgcos19,
Divide both sides by mg:
sin19 = u*cos19,
u = sin19 / cos19 = 0.344.