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Exam1_2011_Fall - Physics 140 Fall 2011 First Midterm Exam...

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Physics 140, Fall 2011 First Midterm Exam Physics Department, University of Michigan October 6, 2011 FORM 1 Please print your name: ____________________________________________ Your INSTRUCTOR:_________________________ INSTRUCTIONS AND INFORMATION 1. Fill in YOUR NAME, UM ID NUMBER, 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 and there is no penalty for guessing. Equations/values that you may find useful: x = x o + v 0,x t + ½ a x t 2 v x = v 0,x + a x t a rad = v 2 /r F = m a W d = F s F k = μ k N g = 9.8 m/s 2
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Physics 140, Fall 2011, Midterm 1 Problem 1: Which of the following is false in a right-handed coordinate system? A. k k = 1 B. j × i = - k C. i ( i × k ) = 0 D. j ( i × k ) = - 1 E. j × k = - i Problem 2: Three blocks (A, B, C), each having mass M, are connected by massless strings as shown. Block C is pulled to the right by a force F that causes the entire system to accelerate on a horizontal tabletop. Neglecting friction, the net force acting on block B is: A. F /2 B. Zero C. F /3 D. 2 F /3 E. F F A B C
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Physics 140, Fall 2011, Midterm 1 Problem 3: A child standing on a bridge throws a rock straight down. The rock leaves the child’s hand at t = 0. Which of the graphs best represents the velocity of the stone as a function of time? Take the positive direction of velocity upward and neglect air resistance. Problem 4: A block rests on a rough horizontal surface ( μ s = 0.50; μ k = 0.40). A constant horizontal force, just sufficient to start the block in motion, is applied. The acceleration of the block, in m/s 2 , is: 0 A v y t 0 B v y t 0 C v y t 0 D v y t 0 E v y t
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Problem 5:
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