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Unformatted text preview: 1 Part I: Multiple Choice Questions (35 points total). 1 . [8 points] An object is moving on the xaxis. Given the sign of v x and the sign of a x , decide whether the object is speeding up or slowing down, and put a check mark ( √ ) in the appropriate boxes of the table: v x a x speeding up slowing down > 0 > 0 > 0 < 0 < 0 > 0 < 0 < 0 2. [3 points] An object is moving at constant speed in the xy plane on a circular orbit of radius 0.50 m. The period of the motion is 4.00 s. At t = 0 the object is at x = 0.50 m, y = 0. At t = 3.00 s, the object is at x = 1.00 m, y = 0.50 m. The magnitude of the average velocity is (A) 0.24 m/s (B) 0.26 m/s (C) 0.71 m/s (D) 0.79 m/s 3. [3 points] A car of mass M on an amusement park ride moves at constant speed v in a vertical circle of radius R . At the bottom of its swing, the tension in its support arm has magnitude (A) Mg (B) Mv 2 /R + Mg (C) Mv 2 /R  Mg (D) Mg  Mv 2 /R (E) ½ ( Mv 2 /R + Mg) (F) Mv 2 /R (G) Mv 2 /2R 2 4 . [3 points] An object moves clockwise at constant speed on an ellipse, as shown. This picture is not a strobe diagram. Consider the points A, B, C, D, E and F. The instantaneous acceleration of the object points to Point P at the center of the ellipse, when the object is at (A) A, C, D, E (B) A and D only (C) All of these points (D) None of these points 5. [3 points] A child holds a bird in her hand. The Third Law partner to the weight of the bird is the force of the (A) Earth on the bird. (B) Hand on the bird. (C) Bird on the earth. (D) Bird on the hand....
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This note was uploaded on 02/25/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.
 Fall '07
 LECLAIR,A
 mechanics

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