HW 1 - johnson (mjj622) HW 1 Coker (56625) 1 This print-out...

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Unformatted text preview: johnson (mjj622) HW 1 Coker (56625) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. This is the first homework assignment, cov- ering material lectured on from Ch. 2 in the textbook. 001 10.0 points The graph shows the velocity v as a function of time t for an object moving in a straight line. t v t Q t R t S t P Which graph shows the corresponding dis- placement x as a function of time t for the same time interval? 1. t x t Q t R t S t P 2. t x t Q t R t S t P 3. t x t Q t R t S t P correct 4. t x t Q t R t S t P 5. t x t Q t R t S t P 6. t x t Q t R t S t P 7. None of these graphs is correct. 8. t x t Q t R t S t P 9. t x t Q t R t S t P Explanation: The displacement is the integral of the ve- locity with respect to time: vectorx = integraldisplay vectorv dt . Because the velocity increases linearly from zero at first, then remains constant, then de- creases linearly to zero, the displacement will increase at first proportional to time squared, then increase linearly, and then increase pro- portional to negative time squared. From these facts, we can obtain the correct answer. t x t Q t R t S t P 002 (part 1 of 4) 10.0 points The following 4 questions refer to a toy car which can move to the right or left along a horizontal line. The positive direction is to the right. Choose the correct velocity-time graph for each of the following questions. Assume fric- tion is so small that it can be ignored. johnson (mjj622) HW 1 Coker (56625) 2 car v g O + Which velocity graph shows the car moving toward the right (away from the origin) at a steady (constant) velocity? 1. None of these graphs is correct. 2. t v 3. t v correct 4. t v 5. t v 6. t v 7. t v 8. t v 9. t v 10. t v Explanation: Since the velocity is constant, the graph is a straight line. Since the car is moving to the right the velocity is positive. t v 003 (part 2 of 4) 10.0 points Which velocity graph shows the car moving towards the right (away from the origin) re- versing direction and then moving to the left? 1. t v johnson (mjj622) HW 1 Coker (56625) 3 2. t v 3. t v 4. t v correct 5. t v 6. t v 7. t v 8. None of these graphs is correct. 9. t v 10. t v Explanation: Since the car reverses its direction, the ve- locity is positive and then negative. t v 004 (part 3 of 4) 10.0 points Which velocity graph shows the car moving toward the left (toward the origin) at a steady (constant) velocity? 1. t v 2. t v 3. t v 4. t v johnson (mjj622) HW 1 Coker (56625) 4 5. t v 6. t v 7. t v 8. t v 9. t v correct 10. None of these graphs is correct. Explanation: Constant velocity is a straight line; toward the left is negative velocity....
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HW 1 - johnson (mjj622) HW 1 Coker (56625) 1 This print-out...

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