Coefficent of Friction
A 23 kg block rests on a surface which has a coefficient of friction of 0.4.
What will be the value of the inclined force, P, when the block is just on the point of sliding?
P is at 30 degrees upwards from the horizontal
http://gyazo.com/6cd518b1a4d4324182e4d99f1fc50a6c
I need working, I know the answer is ~86.3N, just need full worked solution