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Unformatted text preview: Chapter 2: MOTION ALONG A STRAIGHT LINE 1. A particle moves along the x axis from x i to x f . Of the following values of the initial and ¯nal coordinates, which results in the displacement with the largest magnitude? A. x i = 4 m, x f = 6 m B. x i = ¡ 4m, x f = ¡ 8 m C. x i = ¡ 4m, x f = 2m D. x i = 4 m, x f = ¡ 2m E. x i = ¡ 4m, x f = 4m ans: E Section: 2{3; Di±culty: E 2. A particle moves along the x axis from x i to x f . Of the following values of the initial and ¯nal coordinates, which results in a negative displacement? A. x i = 4 m, x f = 6 m B. x i = ¡ 4m, x f = ¡ 8 m C. x i = ¡ 4m, x f = 2m D. x i = ¡ 4m, x f = ¡ 2 m E. x i = ¡ 4m, x f = 4m ans: B Section: 2{3; Di±culty: E 3. The position y of a particle moving along the y axis depends on the time t according to the equation y = at ¡ bt 2 . The dimensions of the quantities a and b are respectively: A. L 2 /T, L 3 /T 2 B. L/T 2 , L 2 /T C. L/T, L/T 2 D. L 3 /T, T 2 /L E. none of these ans: C Section: 2{3; Di±culty: E 4. The average speed of a moving object during a given interval of time is always: A. the magnitude of its average velocity over the interval B. the distance covered during the time interval divided by the time interval C. onehalf its speed at the end of the interval D. its acceleration multiplied by the time interval E. onehalf its acceleration multiplied by the time interval. ans: B Section: 2{4; Di±culty: E 8 Chapter 2: MOTION ALONG A STRAIGHT LINE 5. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km = h and the other is moving at 40km = h mph. In how many hours will they meet? A. 2 : 5 B. 2 : C. 1 : 75 D. 1 : 5 E. 1 : 25 ans: D Section: 2{4; Di±culty: E 6. A car travels 40 kilometers at an average speed of 80km = h and then travels 40 kilometers at an average speed of 40km = h. The average speed of the car for this 80km trip is: A. 40km = h B. 45km = h C. 48km = h D. 53km = h E. 80km = h ans: D Section: 2{4; Di±culty: M 7. A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The magnitude of the average velocity of the car for this round trip is: A. 0 B. 50 km/hr C. 100 km/hr D. 200 km/hr E. cannot be calculated without knowing the acceleration ans: A Section: 2{4; Di±culty: E 8. A car starts from Hither, goes 50 km in a straight line to Yon, immediately turns around, and returns to Hither. The time for this round trip is 2 hours. The average speed of the car for this round trip is: A. 0 B. 50 km/h C. 100 km/h D. 200 km/h E. cannot be calculated without knowing the acceleration ans: B Section: 2{4; Di±culty: E Chapter 2: MOTION ALONG A STRAIGHT LINE 9 9. The coordinate of an object is given as a function of time by x = 7 t ¡ 3 t 2 , where x is in meters and t is in seconds. Its average velocity over the interval from t = 0 to t = 4 s is: A. 5 m = s B. ¡ 5m = s C. 11m = s D. ¡ 11 m = s E. ¡...
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 Spring '08
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 Physics, Acceleration, Velocity, ........., racing car, Stockholm Metro

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