i am stuck on the following problem: a particle of weight w is on an inclined plane that makes an angle of t with the horizontal. the coefficient of static friction is 2*tan(t). find the minimum horizontal force h acting transverse to the slope of the plane that will cause the particle to move. i found the normal force to be w*cos(t) so the force of friction is 2*tan(t)*w*cos(t)=2w*sin(t). i figure that this is the only force opposing h so if h=2w*sin(t) then the particle will move. however, the given answer is 3^(1/2)w*sin(t). any hints would be appreciated. thanks.