The pulley system in Figure 6-18 is used to lift a crate of mass m = 60 kg. Note
ID: 2141755 • Letter: T
Question
The pulley system in Figure 6-18 is used to lift a crate of mass m = 60 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.
The pulley system in Figure 6-18 is used to lift a crate of mass m = 60 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. Determine the force F required to lift the crate with constant speed. Determine the tension in each chain when the crate is being lifted with constant speed. N (top chain) N(bottom chain)Explanation / Answer
Accleration is zero
Hence 2F = m*g
2F = 60 * 9.8
F = 30 * 9.8 = 294 N
Hence 294 N of force is required
Tenson in each chain = 2F = 2 * 294 = 588N
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