FinalSol - Oregon State University Physics 201 Final Exam...

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Oregon State University Physics 201 Final Exam Fall Term, 2009 Form A General directions : Only one sheet of paper (8.5” x 11”—both sides), with only handwritten notes, may be used during this exam. You may use any kind of calculator, provided that it is not part of a PDA, cell phone, palmtop or laptop—and that it is not transmitting any information wirelessly. Physical constants and other possibly useful information are provided here. Answer Question #1 f rst. Physical constants and other possibly useful information: g = 9.80 m/s 2 Question #1: What is the Form designation (A, B, C, D, E, F or X) for your exam—shown at the top of this page? Write this letter in the answer box for Question 1 on the ± rst answer sheet in the exam booklet. For questions 2- 16 : For multiple-choice or true/false items, write the letter of the one best answer in the appropriate box on the answer sheet. For questions requiring short answers (a word or short phrase only), write those in the spaces provided. Youʼre graded on your answers only—no need to show work. Assume 3 signi± cant digits and SI units in all numeric answers unless instructed otherwise. True/False (10 points each) 2. True or false? A normal force cannot do work. F 3. True or false? If you hold an object in your hand and slowly lower your hand at constant speed, you are do- ing positive work on that object. F 4. True or false? Mechanical energy is conserved when two identical objects, moving on a level, frictionless surface at equal speeds, collide head-on and stick together. F 5. True or false? If a mass is swinging like a pendulum on a wire, the wire is doing no work on that mass. T 6. True or false? If an object has a negative x -velocity but a positive x -acceleration, then its speed along the x-axis is increasing. F 7. True or false? When a 1-kg stone, falling vertically at 30 m/s, strikes and stays on a 7-kg sled that was mov- ing over level, frictionless ice at 2 m/s, the sledʼs speed immediately afterward is 5.50 m/s. F Short Answer (10 points each) 8. Express the units of spring stiffness in kg, m, and s. kg/s 2 9. A 92 N force acts on an object at an angle of 45° west of north. While the force is acting, the object moves 100 m at an angle of 36° west of south. What work is done by the force on the object? –1.44 x 10 3 J 10. If an object is rotating clockwise (but not translating), how would you do negative work on that object? Exert a positive (ccw) torque on it; slow it or stop it.
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This note was uploaded on 01/13/2010 for the course PH 201 taught by Professor Staff during the Fall '08 term at Oregon State.

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FinalSol - Oregon State University Physics 201 Final Exam...

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