SampleFinalExam - Final Exam PHY 2130 Monday, April 28,...

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Final Exam PHY 2130 Monday, April 28, 2003 Please type your name here Please type your student number here Instructions: 1. Do all the questions. Show your work for partial credit. I must be able to understand what you have done while I am grading the exam – not when you explain it to me after the exam is graded and returned. 2. For each problem: (a) write down any formula(s) used (b) justify why you used that particular formula(s) (c) show your work! 1. A 6.0-kg object undergoes an acceleration of 2.0 m/s 2 . What is the magnitude of the resultant force acting on it? 1. 1.2 N 2. 15 000 N 3. 12 N * 4. 0.15 N 2. A person takes a trip, driving with a constant speed of 89.5 km/h except for a 22.0- min rest stop. If the person’s average speed is 77.8 km/h, how much time is spent on the trip? 1. 2.8 h * 2. 2.8 min 3. 20 h 4. 5.6 h 3. A child throws a marble into the air with an initial speed v 0 . Another child drops another marble (of the same weight) at the same instant. Compare the accelerations of the two marbles while they are in flight. You can neglect air resistance. Row: Seat:
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1. first marble has greater acceleration 2. second marble has greater acceleration 3. the accelerations of the two marbles are the same * 4. impossible to determine with the provided information 4. A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from 0 to 5.20 m/s in 0.832 s. What are the magnitudes of the linear impulse and the average total force experienced by a 70.0-kg passenger in the car during this time? 1. 245 kg m/s 2 and 438 N 2. 364 kg m/s 2 and 438 N * 3. -245 kg m/s 2 and 4.38 N 4. 2.45 kg m/s 2 and 4.38 N 5. A ball is thrown straight up into the air. At what position is the kinetic energy a maximum? At what position is the gravitational potential energy a maximum? 1. at the highest point of the trajectory; at the lowest point of the trajectory 2. at the lowest point of the trajectory; at the highest point of the trajectory * 3. midway between the highest and the lowest points of the trajectory; at the highest point of the trajectory 4. impossible to determine 6. An electric motor rotating a workshop grinding wheel at a rate of 100 rev/min is switched off. Assume constant negative angular acceleration of magnitude 2.00 rad/
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This note was uploaded on 04/12/2011 for the course PHYS 2130 taught by Professor Petrov during the Spring '11 term at Wayne State University.

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SampleFinalExam - Final Exam PHY 2130 Monday, April 28,...

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