A 68 kg crate is dragged across a floor by pulling on a rope attached to the crate and inclined 158 above the horizontal. (a) If the coefficient of static friction is 0.50, what minimum force magnitude is required from the rope to start the crate moving?
The book suggests this: https://i.stack.imgur.com/x6xHn.png
I don't understand where the ps (sinangle) comes from.
I have Tension = Ps X mg / cos angle. But where does sin angle come from?