S07Prelim1 - 1 Part I Multiple Choice Questions(35 points...

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1 Part I: Multiple Choice Questions (35 points total). 1 . [8 points] An object is moving on the x -axis. 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 x-y 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
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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
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