Physies 410 Name sam 2 Fall 2017 Multiple choice (circle your answer) (4 points
ID: 3280652 • Letter: P
Question
Physies 410 Name sam 2 Fall 2017 Multiple choice (circle your answer) (4 points cach) ) When a car moves in a circle with a constant speed, its a) constantly increasing b) constant in magnitude, but not in direction e) zero d) constant in magnitude and direction e) none of these 2) Is it possible for a system to have negative potential energy a) Yes, as ong as the kinetic energy is positive. b) Yes, as long as the total energy is positive. c) No, because this would have no physical meaning d) No, because the kinetic energy of systems must equal its p tential energy. e) Yes, since the choice of the zero of potential energy is arbitrary. 3) A bucket is being lowered on a rope at a constant speed. Ignoring any effects due to the air a) the tension of the rope is equal to the weight of the bucket b) which is greater depends on how fast the bucket is going. c) the tension of the rope is greater than the weight of the bucket. d) the tension of the rope is less than the weight of the bucket. e) there is no connection between the tension of the rope and the weight of the bucket. 4) A ball rolls up a ramp. At the highest point the ball reaches. a) its acceleration is up the ramp b) its acceleration is vertically up c) its acceleration is zero d) its acceleration is down the ramp e) its acceleration is vertically down Short Answer (4 points) 5) While ice skating, an 35-kg girl runs into a 60-kg Woman who is standing still on heri skates a) Compare the magnitudes of the forces that they experience. b) Which one, if either, experiences the larger acceleration? Explain!Explanation / Answer
1. Centripetal acceleration is constant for constant speeding object in circular motion and directed to the center of the circle, so option (d) is correct
2. Option (e) is correct , yes since the choice of zero of potential energy is arbitrary
3. Option (c) is correct, since at the lowest point tension balances sum of centripetal force as well as weight of the bucket.
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