Prob Set 3 SPH 4U

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Prob Set 3 SPH 4U

Problem
	1.	A 23-kg block slides 18 m on level ground before coming to rest. If 430 J of work are done by friction, calculate the coefficient of friction between the block and the ground.
	2.	A child swings on a swing so that her centre of mass is located 2.4 m from the point where the rope is attached to the tree. If she swings so that her maximum amplitude causes the rope to make an angle of 47° with the vertical, calculate the child’s maximum speed during the swing.
	3.	Two boxes are connected over a pulley and held at rest as shown below. Box A has a mass of 15 kg and box B has a mass of 12 kg. If the bottom of box A is originally 85 cm above the floor, with what speed will it contact the floor when the system is released? Use conservation of energy and assume that friction is negligible.