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Ch2-HW3-solutions

# Ch2-HW3-solutions - louey(cal2859 Ch2-HW3 florin(56930 This...

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louey (cal2859) – Ch2-HW3 – florin – (56930) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001(part1of6)0.0points For each part of this question, match the given graph with the letter (A-I) corresponding to the appropriate description of motion of a fan cart moving along a track. Only one statement will describe each graph and not all descriptions will be used. Assume the usual coordinate system (+ x to the right, + y up, + z out of the page). A. A cart moves to the left, gradually slow- ing down. B. A cart moves to the right, gradually speeding up. C. A cart moves to the left at constant speed. D. A cart moves to the left, gradually slow- ing down, stops, and moves to the right, speeding up. E. A cart remains stationary and does not move. F. A cart moves to the right, gradually slow- ing down. G. A cart moves to the right, gradually slow- ing down, stops, and moves to the left, speeding up. H. A cart moves to the left, gradually speed- ing up. I. A cart moves to the right at constant speed. t v x Correct answer: I. Explanation: Here, the fact that the line is flat tells us that the magnitude and direction of v x are fixed. In this case, v x > 0, so the cart is moving to the right at constant speed. 002(part2of6)0.0points t v x Correct answer: H. Explanation: Here, the cart starts off with negative value of v x , so the cart is moving to the left. It ends with an even larger negative value of v x , with the line smoothly connecting these two points. This tells us that the cart is speeding up toward the left.

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