124_s11_exam2 - Physics 124 Analytical Physics SECOND...

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Unformatted text preview: Physics 124 - Analytical Physics SECOND COMMON HOUR EXAM Monday, Apr. 4, 2011 ⇒ ⇐ 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 earth’s surface g = 9.8 m/s 2 , v sound in air ≈ 340 m/s, ρ air ≈ 1.2 kg/m 3 , the parallel axis theorem is I = I about cm + ml 2 and I = 1 × 10 − 12 W/m 2 in the dB equation. 1. A 5 kg block attached to a massless spring (constant 20 N/m) undergoes simple harmonic motion with amplitude 0.2 m. At time t = 0 its position is x = 0.0 m and it is moving in the + x direction. Which of the following equations gives x ( t ) for the block? a) x = 0.2 cos(2 t ) m b) x = 0.2 cos( t/ 2) m c) x = 0.2 cos(2 t + 0 . 5) m d) x = 0.2 cos( t/ 2 + π/ 2) m e) x = 0.2 cos(2 t- π/ 2) m 2. An object attached to a massless spring undergoes simple harmonic motion of amplitude A along the x axis. At which of the following positions is the kinetic energy of the object twice as large as its potential energy? a) x = A/ √ 3 b) x = A/ √ 2 c) x = A/ 2 d) x = A/ 3 e) The kinetic energy is never two times the potential energy. 3. An object undergoes simple harmonic motion of amplitude A , centered at x =0, along the x axis. At which of the following positions can the acceleration be greater than 0 but the velocity be less than 0? a) x =- A b) x =- A/ 2 c) x = 0 d) x = A/ 2 e) x = A 4. What is the angular frequency ω of simple harmonic motion of a physical pendulum consisting of a solid disk of mass m and radius r undergoing small oscillations about a point on its edge? It might help to remember that the moment of inertia of this disk about its center of mass is I = mr 2 / 2....
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This note was uploaded on 03/02/2012 for the course PHYSICS 124 taught by Professor Madey during the Spring '08 term at Rutgers.

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124_s11_exam2 - Physics 124 Analytical Physics SECOND...

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