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Unformatted text preview: PHY 2011 : Fall 2007 Model Final TOTAL POINTS=100 Time: 50 minutes Name (Please print) : INSTRUCTIONS : Show all your work for the workout (nonmultiple choice) problems so that the grader can clearly follow your line of thought and calculations! Showing work for multiple choice problems is not necessary. Use the reverse sides if necessary. DEFINITELY CIRCLE THE FINAL ANSWERS! (Formulas on last pages) Your final score : ( )/100 1 Questions 120: 2 points each. 1. When a particle undergoes uniform circular motion, its acceleration (a) changes in both magnitude and direction. (b) changes in direction but not in magnitude. (c) changes in magnitude but not in direction. (d) changes in neither magnitude nor direction. 2. The angle between the vectors and is ) 4 3 ( j i ) 3 4 ( j i + (a) zero. (b) 90 degrees. (c) 180 degrees. 3. If there are only two forces acting on an object that moves at a constant velocity, the two forces must have (a) the same direction. (b) the same magnitude. (c) neither the same direction nor the same magnitude. 4. A reference frame rotating at a constant angular speed with respect to an inertial reference frame is (a) another inertial reference frame. (b) a noninertial reference frame. (c) neither of the above. 5. Any component of a vector (a) is always equal to the magnitude of the vector. (b) is never greater than the magnitude of the vector. (c) is always greater than the magnitude of the vector. 6. The magnitude of the average velocity is (a) always greater than the average speed. (b) never greater than the average speed. (c) always equal to the average speed. 7. For a projectile, at its highest point, (a) the velocity is zero. (b) the vertical component of the velocity is zero. (c) the horizontal component of the velocity is zero. 2 8. The sum of two unit vectors will have a magnitude (a) that is always 1. (b) that is between 0 and 1. (c) that is between 0 and 2. 9. If the magnitude of the momentum of a given object increases to 2 times its initial value, the kinetic energy will increase to (a) 2 times its initial value....
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 Spring '08
 SDE
 Physics, Work

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