PHYS 303K HW 1

# PHYS 303K HW 1 - kodeih (njk359) HW 1 Coker (56625) This...

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kodeih (njk359) – HW 1 – Coker – (56625) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. This is the frst 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 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 correct 2. None oF these graphs is correct. 3. t x 0 t Q t R t S t P 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 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 . 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 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

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kodeih (njk359) – HW 1 – Coker – (56625) 2 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. None of these graphs is correct. 3. t v 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. 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
kodeih (njk359) – HW 1 – Coker – (56625) 3 2. t v 3. t v 4. t v 5. None of these graphs is correct. 6. t v 7. t v correct 8. t v 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 correct 2. t v 3. t v 4. t v

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kodeih (njk359) – HW 1 – Coker – (56625) 4 5. t v 6. t v 7. t v 8. t v 9. t v 10. None of these graphs is correct. Explanation: Constant velocity is a straight line; toward the left is negative velocity. 005
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## PHYS 303K HW 1 - kodeih (njk359) HW 1 Coker (56625) This...

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