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# 2048_Fall09_Exam1_Answers - Mueller/Saab PHY2048 Exam 1 1...

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Page 1 of 4 Mueller/Saab PHY2048 Exam 1 September 29, 2009 1. Two girders are made of the same material. Girder A is twice as long as girder B and has a cross-sectional area that is twice as great. The ratio of the mass density of girder A to the mass density of girder B is: (1) 1 (2) 2 (3) 4 (4) 1/2 (5) 1/4 2. A particle moves along the x axis from x i to x f . Of the following values of the initial and final coordinates, which results in the displacement with the largest magnitude? (1) x i = -4 m, x f = 4 m (2) x i = 4 m, x f = 6 m (3) x i = -4 m, x f = -8 m (4) x i = -4 m, x f = 2 m (5) x i = 4 m, x f = -2 m 3. A car travels 40 kilometers at a constant speed of 80 km/h and then travels 60 kilometers at a constant speed of 40 km/h. The average speed of the car for this 100-km trip is: (1) 50 km/h (2) 45 km/h (3) 55 km/h (4) 60 km/h (5) 65 km/h 4. Which of the above five graphs of position, x, versus time, t, represents the motion of an object whose speed is increasing with time? (1) A (2) B (3) C (4) D (5) E 5. A drag racing car starts from rest at t = 0 and moves along a straight line with velocity, v, that varies with time, t, according to v(t) = bt 2 , where b is a constant. The expression for the distance, x, traveled by this car from its position at t = 0 is: (1) bt 3 /3 (2) bt 3 (3) 3bt 3 (4) 2bt (5) bt

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Page 2 of 4 6. If B A B A r r r r + = - and neither A r nor B r vanish, then: (1) A r and B r are parallel and in opposite directions (2) A r and B r are parallel and in the same direction
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2048_Fall09_Exam1_Answers - Mueller/Saab PHY2048 Exam 1 1...

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