Test_2_Practice_Problems - Physics 201 Test 2 Spring 1999...

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Physics 201 Test 2 Spring 1999 Name:________________________ Give each answer to three significant figures. 1. The graph below shows the net force on an object that moves in the +x direction. The net force vector points in the + x direction. As the object passes the point x = 0 its velocity is +5.00 m/s. The mass of the object is 45.0 kg. Determine (a) the work done by the net force as the object moves from x = 0 to x = 7 meters, (b) the velocity of the object as it passes the x = 7 meters point, and (c) the time required for the object to go from x = 7 m to x = 11 m (note that the net force is constant during this 4-meter displacement). Answers: (a) 3500 J (b)13.4 m/s (c) 0.278 s 2. The diagram below shows a frictionless track. At points B and C the track is part of vertical circles of radius 25.00 meters . A 12.00 kg object is released from rest at point A. Determine (a) the height of point A if the sliding object loses contact with the track only at point C and (b) the magnitude of the normal force that the track exerts on the object at point B. Answers: (a) 57.5 m (b) 659 N 0 1 2 3 4 5 6 7 8 9 10 11 Force (N) 600 100 200 300 400 500 0 position of the object (meters) 700 45 m H A = ?
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