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V = r w

Rotation. V = r w. Torque. Center of Gravity. Angular Momentum. Angular momentum = mvr = I w. -- Questions --. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

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V = r w

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  1. Rotation V = rw

  2. Torque

  3. Center of Gravity

  4. Angular Momentum Angular momentum = mvr = Iw

  5. -- Questions -- MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

  6. 1) If you use large-diameter tires on your car, for a given RPM your linear speed will be • more. • less. • C) no different. • 2) The tapered shape of the parts of the wheels that ride on railroad tracks allows opposite wheels to • A) neither of these. • B) in effect, vary their diameters. • C) both of these. • D) travel at different linear speeds for the same rotational speed.

  7. 3) Which will roll down an incline in the shortest time, a can filled with water or the same can filled with ice? • water • B) ice • C) both the same • D) not enough information is given • 4) A space habitat is designed so that the variation in g between a person's head and feet is less than 0.01 g. If the person is 2 m tall, then the minimum radius of the habitat is • 20 m. • B) 200 m. • C) 2000 m. • D) more than 2000 m.

  8. 5) To kick a football so it won't topple end over end, kick it so the force of impact extends • A) through its center of gravity. • B) above its center of gravity. • C) below its center of gravity. • 6) Suppose you are at the center of a large freely-rotating horizontal turntable in a carnival funhouse. As you crawl toward the edge, the angular momentum of you and the turntable • A) decreases. • B) remains the same, but the RPMs decrease. • C) increases. • D) decreases in direct proportion to your decrease in RPMs. • E) none of these.

  9. 7) A torque acting on an object tends to produce • A) a center of gravity. • B) equilibrium. • C) linear motion. • D) velocity. • E) rotation. • 8) Stand a meter stick on its end and let go and it rotates to the floor. If you attach a heavy weight to its upper end and repeat, falling time will be • the same. • less. • C) more.

  10. 9) If a record player's rotational speed is doubled, then the linear speed of a pet hamster sitting on the edge of the record will • halve. • double. • C) remain the same. • 10) A swimming area in a rotating space habitat is located in a 1/4 g region. If a diver can jump 1 m high in a 1 g region, how high can the same diver jump in the swimming area? • 1 m • B) 2 m • C) 4 m • D) 16 m • E) more than 16 m

  11. 11) If the polar icecaps melted, the resulting water would spread over the entire earth. This new mass distribution would tend to make the length of a day • shorter. • stay the same. • C) longer. • 12) A phonograph record player has constant rotational speed. The speed of the record relative to the pickup needle is greatest • A) everywhere because it has the same speed anywhere on the record. • B) at the end of the record. • C) at the beginning of the record.

  12. 13) Consider a rotating donut-shaped space habitat where living quarters are on the inside surface farthest from the axis. If the rotational speed of the habitat increases, the apparent weight of people inside • decreases. • stays the same. • C) increases. • 14) The center of mass of a human body is located at a point • A) that is always directly behind the belly button. • B) that changes as a person bends over. • C) which is fixed, but different for different people. • D) none of these.

  13. 15) Suppose you put very large-diameter tires on your car. Then, your speedometer will show a speed that is • higher than it is actually. • B) lower than it is actually.

  14. -- Answers -- MULTIPLE CHOICE. The one alternative that best completes the statement or answers the question.

  15. Chapter 8 1) Answer: A 2) Answer: C 3) Answer: A 4) Answer: B 5) Answer: A 6) Answer: B 7) Answer: E 8) Answer: C 9) Answer: B 10) Answer: C 11) Answer: C 12) Answer: C 13) Answer: C 14) Answer: B 15) Answer: B

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