{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

HW 1-solutions - morris(gmm643 HW 1 Coker(56625 This...

Info icon This preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
morris (gmm643) – 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 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. 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 correct 7. None of these graphs is 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: vectorx = integraldisplay vectorvdt. 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 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 each of the following questions. Assume fric- tion is so small that it can be ignored.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
morris (gmm643) – 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. t v correct 2. t v 3. t v 4. t v 5. None of these graphs is correct. 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
Image of page 2
morris (gmm643) – HW 1 – Coker – (56625) 3 2. t v 3. t v 4. t v 5. t v 6. t v 7. t v correct 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
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
morris (gmm643) – HW 1 – Coker – (56625) 4 5. t v 6. t v 7. t v 8. t v correct 9. None of these graphs is correct.
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}