PHC7Quizzes - 2004 Quiz 1. A roller coaster car is on a...

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2004 Quiz 1. A roller coaster car is on a track that forms a circular loop in the vertical plane. If the car is to just maintain contact with track at the top of the loop, what is the minimum value for its centripetal acceleration at this point? A.* g downward B. 2 g downward C. g upward D. 2 g upward E. Not covered in the assigned reading. 2. A spaceship is traveling to the moon. At what point is it beyond the pull of earth's gravity? A. When it gets above the atmosphere B. When it is half-way there C. When it is closer to the moon than it is to earth D.* It is never beyond the pull of earth's gravity. E. Not covered in the assigned reading. 3. A spherically symmetric planet has four times the earth's mass and twice its radius. If a jar of peanut butter weighs 12 N on the surface of the earth, how much would it weigh on the surface of this planet? A. 6 N B.* 12 N C. 24 N D. None of these. E. Not covered in the assigned reading. 4. An astronaut is inside a space capsule in orbit around the earth. The earth's gravity causes the space capsule to move in a circle around the earth at constant speed. The astronaut is able to float inside the capsule because A. her weight is zero, and her capsule's weight is zero. B. her weight is zero, and her capsule is accelerating. C. she and her capsule move with the same constant velocity. D.* she and her capsule move with the same acceleration. E. Not covered in the assigned reading. 5. Is it possible for an object moving around a circular path to have both centripetal and tangential acceleration? A. No, because then the path would not be a circle. B. No, an object can only have one or the other at any given time. C. Yes, this is possible if the speed is constant. D.* Yes, this is possible if the speed is changing. E. Not covered in the assigned reading. 6. An object moves in a circular path at a constant speed. Consider the direction of the object's velocity and acceleration vectors. Which of the following is true? A. Both vectors point in the same direction. B. The vectors point in opposite directions. C.* The vectors are perpendicular. D. The question is meaningless, since the acceleration is zero. E. Not covered in the assigned reading. 7. A car goes around a curve of radius R at a constant speed v . Then it goes around a curve of radius 2 R at speed 2 v . What is the centripetal acceleration on the car as it goes around the second curve, compared to the first? A. one fourth as big B. one half as big C.* twice as big D. four times as big E. Not covered in the assigned reading. 8. A car goes around a curve of radius R at a constant speed v . What is the direction of the net force on the car? A.* toward the curve's center B. away from the curve's center C. toward the front of the car D. toward the back of the car E. Not covered in the assigned reading. 9.
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This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at University of California, Berkeley.

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PHC7Quizzes - 2004 Quiz 1. A roller coaster car is on a...

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