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PHC7Quizzes

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? 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? 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 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? 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.

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