Exam1_2010_Fall_Solutions

# Exam1_2010_Fall_Solutions - Physics 140 Fall 2010 First...

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Unformatted text preview: Physics 140, Fall 2010 First Midterm Exam Physics 1)epartment, University of Michigan October 7, 2010 FORM 1 Please print your name: c k EJJ Your iNSTRUCTOR:____________________ INSTRUCTIONS AND INFORMATION 1. Fill in YOUR NAME, INSTRUCTOR and the EXAM FORM NUMBER on the scantron. 2. RECORD YOUR ANSWERS ON THE SCANTRON USING A #2 PENCIL. 3. Turn in this exam copy with your scantron answer sheet. 4. This is a 90-minute, closed book exam. You may use one 3” x 5” card on which you have your favorite equations. You also may use a calculator but please do not share calculators. 5. All cell phones and other communication devices must be shut off and out of sight. 6. There are altogether 20 multiple choice questions. All questions are of equal value. Equations/values that you may find useful: = s + v0 t + V 2 a t 2 Vf — v0 + at arad = v/r F — ma W = F.s Fk = kN g — 9.8 rn/s 2 Problem 1: Physics 140, Fall 2010, Midterm I A cube of edge length a is positioned with one of its corners at the origin of the Cartesian coordinate system as shown. What is the angle 0 between the body diagonal (line OA) and the face diagonal (line OBy? e4+• r ’ 4 D 48 2° E ; 3- I ’ 2- t L ( 4 ’ Problem 2: In a video game, a soccer ball’s trajectory on the screen is described in pixel units as r = (25_2t+3t2 _4t3)L+(12+t_3t2 +5t3)j. What is the magnitude of the ball’s acceleration at time t= 2.0 s? A. 76.4 pixel/s 2 B.8.4 pixel/s 2 C. 62.1 pixel/s 2 D. 53.7 pixel/s 2 E. 44.6 pixel/s 2 r i H z B a y a a o A. 73.8° B. 65.9° C. 60.0° (4, — I;’ ( ‘ 3 L . ) Problem 3: Physics 140, Fall 2010, Midterm 1 / / You are on the roof of the Dennison Building, 49 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1 .6 m/s. If y o u wish to drop a rotten tomato on your professor’s head, where should the professor be from the point directly below you when you release the tomato? B. 3.86 m C. 4.97 m . / o c ç - L L a J k . - B A A rabbit is chased by a fox and atte mpting to escape maintains a constant speed as it traces the path shown from A to C. Which of the arrows best represent the velocity and acceleration of the rabbit at point...
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## This note was uploaded on 02/15/2012 for the course PHYS 140 taught by Professor Uher during the Winter '10 term at University of Michigan.

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Exam1_2010_Fall_Solutions - Physics 140 Fall 2010 First...

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