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# solution_2 - ouseph(jao888 – HW02 – tsoi –(92940 1...

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Unformatted text preview: ouseph (jao888) – HW02 – tsoi – (92940) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 5) 10.0 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. None of these graphs is correct. 3. t a 4. t a correct 5. t a 6. t a 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) 10.0 points What is the acceleration-time graph if the car moves toward the right, slowing down at a steady rate? 1. t a 2. t a correct 3. t a 4. None of these graphs is correct. ouseph (jao888) – HW02 – tsoi – (92940) 2 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) 10.0 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. None of these graphs is correct. 3. t a 4. t a 5. t a 6. t a 7. t a 8. t a correct Explanation: Since the car moves at a constant velocity, the acceleration is zero. 004 (part 4 of 5) 10.0 points What is the acceleration-time graph if the car moves toward the left, speeding up at a steady rate? 1. t a ouseph (jao888) – HW02 – tsoi – (92940) 3 2. t a correct 3. t a 4. t a 5. t a 6. t a 7. t a 8. None of these graphs is correct. Explanation: The same reason as Part 1. 005 (part 5 of 5) 10.0 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 correct 6. t a 7. t a 8. t a Explanation: The same reason as Part 3. 006 10.0 points ouseph (jao888) – HW02 – tsoi – (92940) 4 What magnitude is not possible when a vec- tor of magnitude 3 is added to a vector of magnitude 4? 1. 1 2. 3 3. 7 4. correct 5. 5 Explanation: The smallest magnitude of the resultant occurs when the vectors are anti-parallel ( R = 1); the largest occurs when they are parallel ( R = 7), so all listed values are possible except R = 0. 007 (part 1 of 2) 10.0 points A ball is thrown upward with an initial verti- cal speed of v to a maximum height of h max . b b b b b b b b b b b b b b b b b b b b v h max What is its maximum height? The acceler- ation of gravity is g . Neglect air resistance. 1. h max = √ 3 v 2 2 √ 2 g 2. h max = √ 5 v 2 2 √ 2 g 3. h max = v 2 g 4. h max = v 2 4 g 5. h max = v 2 2 g correct 6. h max = 3 v 2 4 g 7. h max = √ 3 v 2 2 g 8. h max = v 2 √ 2 g 9. h max = 5 v 2 8 g Explanation: With up positive, a = − g and for the up- ward motion t f = 0, so for constant accelera- tion, v 2 f = v 2 + 2 a ( x − x ) 0 = v 2 − 2 g ( h max − 0) h max = v 2 2 g ....
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solution_2 - ouseph(jao888 – HW02 – tsoi –(92940 1...

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