124s11h1exampost

124s11h1exampost - Physics 124 - Analytical Physics FIRST...

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Unformatted text preview: Physics 124 - Analytical Physics FIRST COMMON HOUR EXAM Monday, Feb. 21, 2011 Professor Ron Gilman SIGN HERE NOW: 1. The exam will last from 9:40 - 11:00 p.m. Use a #2 pencil to make entries on the answer sheet. Enter ID information items 2-5, now, on the answer sheet before the exam starts... 2. In the section labeled NAME (Last, First, M.I.) enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial. 3. Under STUDENT # enter your 9-digit RUID Number. 4. Enter 124 under COURSE; you may ignore the section number. 5. Under CODE enter the exam code given above. 6. During the exam, you may use pencils, a calculator, and one 8.5 x 11 inch sheet (both sides) with formulas and notes. 7. There are 18 multiple-choice questions on the exam. For each question, mark only one answer on the answer sheet. There is no deduction of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. At the end of the exam, hand in the answer sheet and this SIGNED cover page. Retain the exam questions attached for future reference and study. 8. When you are asked to open the exam, make sure that your copy contains all 18 questions. Raise your hand if this is not the case, and a proctor will help you. Also raise your hand during the exam if you have a question. 9. Please have your student ID ready to show to the proctor during the exam. 10. Possibly useful information : at the earths surface g = 9.8 m/s 2 , G = 6.67 10- 11 Nm 2 /kg 2 , m earth = 6 10 24 kg, r earth = 6.4 10 6 m, I hoop = mr 2 , I solid disc = (1 / 2) mr 2 , I solid ball = (2 / 5) mr 2 , and I stick about end = (1 / 3) ml 2 . 1. Two masses hang from massless ropes attached at different radii to a 1-kg pulley. The left mass, m 1 = 5 kg, hangs from a radius of 0.2 m; the right mass, m 2 = 10 kg, hangs from a radius of 0.1 m. There is friction between the rope and the pulley. The pulley is supported at its c.m. What is the net torque on the pulley from the forces acting on it? a) 0 N m b) 4.9 N m c) 9.8 N m d) 19.6 N m e) 196 N m 2. Your professor puts several objects on an inclined plane. All roll without slipping down the inclined plane. Which gets to the bottom first? a) hollow sphere, radius r b) solid cylinder, radius r c) solid cylinder, radius 2 r d) solid sphere, radius r e) hollow cylinder, radius 2 r 3. The flywheel of an engine rotates at 10 rad/s with an applied power of 10 W. What is the frictional torque in the engine? a) 0.1 N m b) 1 N m c) 10 N m d) 100 N m e) Cannot be determined from information given. 4. A 2.0 kg solid disc 0.5 m in radius (neglect its thickness) slides along a frictionless horizontal floor without rotating at a steady 2 m/s. What is the angular momentum of the disc about a point P on the floor?...
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124s11h1exampost - Physics 124 - Analytical Physics FIRST...

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