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A 4-kg block lies on a horizontal table whose coefficient of friction is 0.3. A horizontal rope is redirected by a uniform solid disk (pulley) of mass 2 kg to a mass of 12-kg hanging off the table. The radius of the solid disk is 10 cm and the rope doesn't slip on the disk.
(a) What is the linear acceleration of the 4-kg block?
(b) What is the angular acceleration of the disk?
(c) What is the tension in the rope?
(d) How far does the top block travel in 2 s?
(e) How many revolutions does the disk of the pulley make in 2 s?
(f) How far does a point on the edge of the disk of the pulley travel in 2 s?
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A 79kg person holds out his arms so that his hands are 1.6m apart. Normally, a person's hand makes up about 1% of his or her body weight. For round numbers, we shall assume that all the weight of each hand is due to the calcium in the bones.
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