h1onedimkinematics_solution

h1onedimkinematics_solution - honea (cth632)...

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honea (cth632) – H1OneDimKinematics – Avram – (1955) 1 This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points While John is traveling along an interstate highway, he notices a 148 mi marker as he passes through town. Later John passes a 119 mi marker. What is the distance between town and John’s current location? Correct answer: 29 mi. Explanation: The change in position is given by Δ s = s f - s o so that the distance between the points is d = | b - a | = | 119 mi - 148 mi | = 29 mi . 002 (part 2 oF 2) 10.0 points What is John’s current position? Correct answer: 119 mi. Explanation: Position is measured From the original po- sition, so his current position is 119 mi. 003 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 0 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 0 t Q t R t S t P 2. t x 0 t Q t R t S t P 3. None oF these graphs is correct. 4. t x 0 t Q t R t S t P 5. t x 0 t Q t R t S t P 6. t x 0 t Q t R t S t P 7. t x 0 t Q t R t S t P correct 8. t x 0 t Q t R t S t P 9. t x 0 t Q t R t S t P Explanation: The displacement is the integral oF the ve- locity with respect to time: Vx = i Vv dt .
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honea (cth632) – H1OneDimKinematics – Avram – (1955) 2 Because the velocity increases linearly from zero at Frst, then remains constant, then de- creases linearly to zero, the displacement will increase at Frst proportional to time squared, then increase linearly, and then increase pro- portional to negative time squared. ±rom these facts, we can obtain the correct answer. t x 0 t Q t R t S t P 004 (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. car v g O + Which velocity graph shows the car moving toward the right (away from the origin) at a steady (constant) velocity? 1. t v 2. t v 3. None of these graphs is correct. 4. t v 5. t v 6. t v 7. t v 8. t v 9. t v 10. t v correct Explanation: Since the velocity is constant, the graph is a straight line. Since the car is moving to the right the velocity is positive.
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honea (cth632) – H1OneDimKinematics – Avram – (1955) 3 t v 005 (part 2 of 4) 10.0 points Which velocity graph shows the car mov- ing towards the right (away from the origin) reversing direction and then moving to the left? 1.
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h1onedimkinematics_solution - honea (cth632)...

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