ch02 - Chapter 2: MOTION ALONG A STRAIGHT LINE 1. A...

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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; Diculty: 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; Diculty: 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; Diculty: 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. one-half its speed at the end of the interval D. its acceleration multiplied by the time interval E. one-half its acceleration multiplied by the time interval. ans: B Section: 2{4; Diculty: 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; Diculty: 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 80-km trip is: A. 40km = h B. 45km = h C. 48km = h D. 53km = h E. 80km = h ans: D Section: 2{4; Diculty: 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; Diculty: 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; Diculty: 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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ch02 - Chapter 2: MOTION ALONG A STRAIGHT LINE 1. A...

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