College Physics
College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Question
Answer the following problems and explain your answers for better understanding.
41. A car is moving in a circular path of radius 50 m with a speed of 20 m/s. What is the tangential acceleration of the car? a. 6.25 m/s² b. 0.625 m/s² c. 62.5 m/s² d. 625 m/s² E. Other: 42. What can you say on the two forces acting on an object that is initially at rest for it to remain at rest? a. the same magnitude, opposite directions c. different magnitudes, opposite directions b. the same magnitude, the same direction d. different magnitudes, the same direction E. Other: 43. In the 2008 Olympics, Jamaican sprinter Usain Bolt shocked the world as he ran the 100-m dash in 9.69 seconds. What is Usain's average speed for the race? Express your answer in the nearest whole number. a. 11 m/s b. 10 m/s c. 9 m/s d. 8 m/s E. Other: 44. A truck travels 90 meters due north in 10 seconds. Then the car turns around and travels 40 meters due south. What is the magnitude and direction of the car's resultant displacement? a. 40 m, South b. 50 m, South c. 40 m, North d. 50 m, North E. Other: 45. An object completes 1.5 circular orbits in half a minute. It orbits with a radius of 2 m. What is its approximate angular velocity? a. 0.05 rad/s b. 0.30 rad/s c.0.50 rad/s E. Other: d. 3 rad/s
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Transcribed Image Text:41. A car is moving in a circular path of radius 50 m with a speed of 20 m/s. What is the tangential acceleration of the car? a. 6.25 m/s² b. 0.625 m/s² c. 62.5 m/s² d. 625 m/s² E. Other: 42. What can you say on the two forces acting on an object that is initially at rest for it to remain at rest? a. the same magnitude, opposite directions c. different magnitudes, opposite directions b. the same magnitude, the same direction d. different magnitudes, the same direction E. Other: 43. In the 2008 Olympics, Jamaican sprinter Usain Bolt shocked the world as he ran the 100-m dash in 9.69 seconds. What is Usain's average speed for the race? Express your answer in the nearest whole number. a. 11 m/s b. 10 m/s c. 9 m/s d. 8 m/s E. Other: 44. A truck travels 90 meters due north in 10 seconds. Then the car turns around and travels 40 meters due south. What is the magnitude and direction of the car's resultant displacement? a. 40 m, South b. 50 m, South c. 40 m, North d. 50 m, North E. Other: 45. An object completes 1.5 circular orbits in half a minute. It orbits with a radius of 2 m. What is its approximate angular velocity? a. 0.05 rad/s b. 0.30 rad/s c.0.50 rad/s E. Other: d. 3 rad/s
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