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Unformatted text preview: johnson (mjj622) HW 1 Coker (56625) 1 This printout should have 22 questions. Multiplechoice 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 velocitytime 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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