You have a block on the incline plane 130 Newtons and it's attached by a rope through a "frictionless" pulley to another block of 45 Newtons hanging of the side of a plane. The question is what angle pheida has to be in order for a 130 Newtons block to start sliding up the plane (not accelerating) when coefficient of friction is 0.62. I think the equasion starts like this: 45=130*sinO + 0.62*130*cosO I've tried solving for it, but it's not coming out. Can anyone help!!