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Exam1_2011_Fall

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

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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
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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