PHY_1505_Mock_Exam 2020/2021

PHY_1505_Mock_Exam 2020/2021 Name: _________________________ Score: ______ / ______ Mock Examination Part 1 Two objects are dropped from a bridge, an interval of 1.0 s apart, and experience no appreciable air resistance. As time progresses, the DIFFERENCE in their speeds. A. A. increases. B. Remains constant. C. C. decreases. D. D. increases at first, but then stays constant. E. E. decreases at first, but then stays constant. Answer Point Value: 4.0 points Answer Key: B As part of an exercise program, a woman walks south at a speed of 2.00 m/s for 60.0 minutes. She then turns around and walks north a distance 3000 m in 25.0 minutes. What is the woman's average velocity during her entire motion? A. 0.824 m/s south B. 1.93 m/s south C. 2.00 m/s south D. 1.79 m/s south E. 800 m/s south Answer Point Value: 4.0 points Answer Key: A The velocity of an object as a function of time is given by : v(t) = 2.00 m/s + (3.00 m/s) t - (1.0 m/s2 ) t2 . Determine the instantaneous acceleration of the object at time t = 4.00 s. A. - 2.00 m/s2 B. - 5.00 m/s2 C. 1.00 m/s2 D. 0.00 m/s2 E. -1.00 m/s2 Answer Point Value: 4.0 points