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Quiz1-solutions

# Quiz1-solutions - Version 028 – Quiz 1 – gentle...

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Unformatted text preview: Version 028 – Quiz 1 – gentle – (56245) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points A car initially at rest on a straight road accelerates according to the acceleration vs time plot. t a t 1 t 2 t 3 t 4 What is the best description of the motion of the car? Take forward to be the positive direction. 1. The car starts at rest, accelerates to a high speed, cruises for a short while, decelerates to a lower speed, then cruises. correct 2. The car goes forward and then goes back- ward, ending behind where it started. 3. The car goes forward and then goes back- ward, ending where it started. 4. The car starts at rest, accelerates to a low speed, comes to a stop, accelerates backwards and cruises in reverse. 5. The car starts at rest, goes up to a high speed, stops moving, travels backward, and stops. 6. The car goes backward and then goes forward. Explanation: Use the acceleration to determine the ve- locity behavior: 1) v = 0 (initially at rest) 2) 0 < t < t 1 : a = 0 (remains at rest) 3) t 1 < t < t 2 : a > 0 (accelerates forward) 4) t 2 < t < t 3 : a = 0 (constant speed) 5) t 3 < t < t 4 : a < 0 (decelerates) 6) t 4 < t : a = 0 (constant speed) 002 (part 2 of 2) 10.0 points Which of the following graphs describes the velocity vs time of the car? 1. t v t 1 t 2 t 3 t 4 2. None of these graphs is correct. 3. t v t 1 t 2 t 3 t 4 4. t v t 1 t 2 t 3 t 4 correct 5. t v t 1 t 2 t 3 t 4 6. t v t 1 t 2 t 3 t 4 7. t v t 1 t 2 t 3 t 4 8. t v t 1 t 2 t 3 t 4 Version 028 – Quiz 1 – gentle – (56245) 2 9. t v t 1 t 2 t 3 t 4 Explanation: 1) 0 < t < t 1 : v = 0 2) t 1 < t < t 2 : velocity increases uniformly 3) t 2 < t < t 3 : constant velocity 4) t 3 < t < t 4 : velocity decreases uniformly 5) t 4 < t : constant velocity The velocity vs time graph can be found by plotting the area under the acceleration vs time curve. 003 10.0 points A basketball player achieves a hang time of . 658 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9 . 8 m / s 2 . 1. 0.396607 2. 1.50932 3. 1.11957 4. 1.62006 5. 1.73472 6. 0.636805 7. 0.59341 8. 0.530381 9. 0.563113 10. 1.225 Correct answer: 0 . 530381 m....
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Quiz1-solutions - Version 028 – Quiz 1 – gentle...

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