The pulley system in Figure 6-25 is used to lift a crate of mass m = 47 kg. Note that a chain connects the upper pulley to the ceiling and a second...

The pulley system in Figure 6-25 is used to lift a crate of mass m = 47 kg. Note that a chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible.