PROBLEMS
52
167. A system composed' of fixed and movable pulleys (Fig. 67) is in equilibrium. Determine the weight Q if P = = 10 kgf.
Fig. 65
Fig. 66
Will the equilibrium be disturbed if point A where the rope is fastened is shifted to the right? If the equilibrium is disturbed, how will the weights P and Q move? Neglect the mass of the pulleys, the weight of the rope and the friction. A
p Fig. 68
168. A lightrod is secured at point 0 and can revolve in A is attached to a thread wrapped around a fixed pulley. The weight P is suspended from the other end or" the thread. A weight Q is attached to the rod at point B. The length a vertical plane (Fig. 68). The end of the rod at point