on2 - Solution to On-Line Homework Problem 2.2(Running...

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Solution for On-Line Homework 2 Velocity II Solution to On-Line Homework Problem 2.1(Discriminating vector from scalar: velocity vs speed) Problem: Which one of these statements best helps discriminate between speed and velocity? Select One of the Following: (a) Speed is a scalar because it has a direction as well as units and a magnitude. (b) Speed is a vector because it has a direction as well as units and a magnitude. (c) Velocity is a scalar because it has a direction as well as units and a magnitude. (d-Answer) Velocity is a vector because it has a di- rection as well as units and a magnitude. (e) Neither of these correctly discriminates between speed and velocity. Solution Speed is the rate of movement of an object. .. commonly put as “how fast something is moving”. Thus, speed is a scalar quantity. Velocity, however, is only satis±ed when one provides not only a speed but also a direction in which the object is moving at that speed. Therefore, velocity is a vector quantity. 1
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Total Points for Problem: 2 Points
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Unformatted text preview: Solution to On-Line Homework Problem 2.2(Running equal distances. ..not necessarily displacements!) Problem: As my younger daughter practices running hurdles around the oval track at the nearby high school, you observe her to cover equal distances each second. You now conclude: Select One of the Following: (a-Answer) That she has a constant speed. (b) That she has a constant velocity. (c) Neither A nor B. (d) Both A and B. (e) That she is now at rest. Solution If she is covering equal distances each second, then she has a constant speed. Since the problem does not clearly state the direction of motion, you cannot conclude that she has a constant velocity, which is only if you are going in a straight line. In fact, the problem implies going equal distances per time while going around a curve, so she would not have a constant velocity. All you can conclude is answer A. Total Points for Problem: 2 Points 2...
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This note was uploaded on 05/04/2008 for the course PHYS 2054 taught by Professor Stewart during the Spring '08 term at Arkansas.

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on2 - Solution to On-Line Homework Problem 2.2(Running...

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