A system of pulleys consisting of a fixed block and movable block (Fig.) is in equilibrium. Find the size of the load Q if the load P weighs 10kg-wt. Will the equilibrium be **** if the point at which rope A is fixed is shifted to the right? If the equilibrium will be ****, which way will loads P and Q move? Neglect the masses of the block, the weight of the rope, and friction.
Q = P/2; if points is shifted, the equilibrium is *****, load P will drop; and load Q will rise.
The answer is readily obtained from the principle of virtual work and from the sum of the forces acting on the movable block.
