# on19 - An object traveling in a circle at constant speed...

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Solution for On-Line Homework 19 Motion in a Circle II Solution to On-Line Homework Problem 19.1() Problem: A car is experiencing both a centripetal nd a tangential acceleration. Which of the situations below could correclty decribe a motion for which this is the case? Select One of the Following: (a) It is going around a curve at constant speed. (b-Answer) It is going around a curve at and slowing down. (c) It is going along a straight road at constant speed. (d) It is going along a straight road at increasing speed. (e) It is going along a straight road at decreasing speed. Solution We have an acceleration toward the middle, so there has to be circular motion. We also have an acceleration along the direction of motion, so we must be changing speed, either speeding up or slowing down. Only one choice has both types of acceleration. Total Points for Problem: 2 Points 1

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Solution to On-Line Homework Problem 19.2() Problem:
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Unformatted text preview: An object traveling in a circle at constant speed Select One of the Following: (a) is moving with constant velocity. (b-Answer) has an angular acceleration of zero. (c) has a tangential acceleration that is nonzero. (d) has a centripetal acceleration that is zero. Solution ω av = Δ ϑ Δ t = v av R is the average rotational velocity, which is equal to the rotational displacement ( Δ ϑ ) divided by the time interval Δ t over which the displacement occurs, and is a constant, one complete revolution per minute. Angular acceleration will be zero, since angular velocity is constant. There is no acceleration tangential to the circular path, so the tangential acceleration is zero. We have uniform circular motion, so there has to be an acceleration toward the middle, or we wouldn’t be going in a circle, so a c cannot be zero. 2 Total Points for Problem: 2 Points 3...
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