On this question, why isn't the second answer true? Can't you theoretically define your fulcrum to be anywhere so that if you define the fulcrum to be at the very left point of block 2, then the weight of block 1 does indeed exert a clockwise torque about the right end of block 2?
On hint 7, I don't know why they can define those as the fulcrum because my understanding is that you can define any point as the fulcrum.
