physics HW2

# physics HW2 - rose(kmr2427 – HW#2 – Antoniewicz...

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Unformatted text preview: rose (kmr2427) – HW #2 – Antoniewicz – (57380) 1 This print-out should have 22 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 5) 2.0 points Consider a toy car which can move to the right (positive direction) or left on a horizon- tal surface along a straight line. car v O + What is the acceleration-time graph if the car moves toward the right (away from the origin), speeding up at a steady rate? 1. t a 2. t a 3. t a correct 4. t a 5. t a 6. None of these graphs is correct. 7. t a 8. t a Explanation: Since the car speeds up at a steady rate, the acceleration is a constant. 002 (part 2 of 5) 2.0 points What is the acceleration-time graph if the car moves toward the right, slowing down at a steady rate? 1. t a 2. None of these graphs is correct. 3. t a correct rose (kmr2427) – HW #2 – Antoniewicz – (57380) 2 4. t a 5. t a 6. t a 7. t a 8. t a Explanation: Since the car slows down, the acceleration is in the opposite direction. 003 (part 3 of 5) 2.0 points What is the acceleration-time graph if the car moves towards the left (toward the origin) at a constant velocity? 1. t a 2. t a 3. t a 4. t a 5. t a 6. t a 7. t a correct 8. None of these graphs is correct. Explanation: Since the car moves at a constant velocity, the acceleration is zero. 004 (part 4 of 5) 2.0 points What is the acceleration-time graph if the car moves toward the left, speeding up at a steady rate? rose (kmr2427) – HW #2 – Antoniewicz – (57380) 3 1. None of these graphs is correct. 2. t a 3. t a 4. t a 5. t a correct 6. t a 7. t a 8. t a Explanation: The same reason as Part 1. 005 (part 5 of 5) 2.0 points What is the acceleration-time graph if the car moves toward the right at a constant velocity? 1. None of these graphs is correct. 2. t a 3. t a 4. t a 5. t a 6. t a correct 7. t a rose (kmr2427) – HW #2 – Antoniewicz – (57380) 4 8. t a Explanation: The same reason as Part 3. 006 (part 1 of 3) 4.0 points A train travels between stations 1 and 2, as shown in the figure. The engineer of the train is instructed to start from rest at station 1 and accelerate uniformly between points A and B, then coast with a uniform velocity be- tween points B and C, and finally decelerate uniformly between points C and D until the train stops at station 2. The distances AB, BC, and CD are all equal, and it takes 5 . 40 min to travel between the two stations. As- sume that the uniform accelerations have the same magnitude, even when they are opposite in direction. Station A Station B A B C D How much of this 5 . 40 min period does the train spend between points A and B? Correct answer: 2 . 16 min. Explanation: Δ x AB = Δ x BC = Δ x CD Δ t AB + Δ t BC + Δ t CD = 5 . 40 min v A = v D = 0 m / s v = Δ x Δ t = v o + v f 2 Δ t = Δ x v = 2 Δ x v o + v f ....
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## This note was uploaded on 03/01/2011 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.

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physics HW2 - rose(kmr2427 – HW#2 – Antoniewicz...

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