# HW3 - Pickering Tracey Homework 3 Due noon Inst Drummond...

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Pickering, Tracey – Homework 3 – Due: Jan 27 2006, noon – Inst: Drummond 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points The diagram describes the acceleration vs t behavior for a car moving in the x -direction. a P Q t 0 At the point Q , the car is moving 1. with a decreasing speed 2. with an increasing speed correct 3. with a constant speed Explanation: a = dv dt . As long as the acceleration is positive the velocity is always increasing. 002 (part 1 of 5) 10 points The following 5 questions refer to a toy car which can move to the right or left on a horizontal surface along a straight line (the + distance axis). The positive direction is to the right. Dif- ferent motions of the car are described be- low. Choose the acceleration-time graph which corresponds to the motion of the car described in each statement. car v g O + The car moves toward the right (away from the origin), speeding up at a steady rate. 1. t a correct 2. t a 3. t a 4. t a 5. t a 6. t a 7. None of these graphs are correct. 8. t a Explanation: Since the car speeds up at a steady rate,

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Pickering, Tracey – Homework 3 – Due: Jan 27 2006, noon – Inst: Drummond 2 the acceleration is a constant. 003 (part 2 of 5) 10 points The car moves toward the right, slowing down at a steady rate. 1. t a 2. None of these graphs are correct. 3. t a 4. t a 5. t a correct 6. t a 7. t a 8. t a Explanation: Since the car slows down, the acceleration is in the opposite direction. 004 (part 3 of 5) 10 points The car moves towards the left (toward the origin) at a constant velocity. 1. t a correct 2. t a 3. None of these graphs are correct. 4. t a 5. t a 6. t a
Pickering, Tracey – Homework 3 – Due: Jan 27 2006, noon – Inst: Drummond 3 7. t a 8. t a Explanation: Since the car moves at a constant velocity, the acceleration is zero. 005 (part 4 of 5) 10 points The car moves toward the left, speeding up at a steady rate. 1. t a 2. t a 3.

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