A 121 lb. weight is being help up by a block and tackle pulley system of 3 attached pulleys also attached to the weight and three attached pulleys hooked to the ceiling. If a rope is tied to a hook on the bottom set of pulleys, then strung through a 1st top pulley then 1st bottom pulley then-2nd top pulley-2nd bottom pulley-3rd top pulley-3rd bottom pulley, then rope held-up by a person. What is the tension in the rope?

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1. A moving company rigs a pulley system to lift a piano to a fourth floor balcony 44 feet from the ground. The pulley system has 7 ropes with one pulling down and 6 supporting the load and the piano weighs 1200lbs. What is the Ideal MA of this system? Assuming 88% efficiency what is the True MA of this system? True MA, how much force would be required to lift the plano? the piano to the balcony? Using the How much rope would be pulled to lift

The 150-kg uniform crate rests on the 10-kg cart (see Figure 1). Determine the maximum force P that can be applied to the handle without causing the crate to slip or tip on the cart. The coefficient of static friction between the crate and cart is us = 0.2. P 0.5 m Prob. 17-38 Figure 1 1 m