HW2 - Niu(qn269 HW02 Tsoi(58020 This print-out should have...

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Niu (qn269) – HW02 – Tsoi – (58020) 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 3) 10.0 points Given: The acceleration of gravity on Earth is 9 . 8 m / s 2 . Consider a ball thrown up from the ground (the point O). It passes a window (the seg- ment AB) in the time interval 0 . 262 s (see the figure). The points in the figure represent the sequential order, and are not drawn to scale. The distance AB = 1 . 17 m. O C B A 1 . 17 m x y Find the average speed as the ball passes the window. Answer in units of m / s. 002 (part 2 of 3) 10.0 points What is the magnitude of the decrease of the velocity from A to B? Answer in units of m / s. 003 (part 3 of 3) 10.0 points If the ball continues its path upward without obstruction, find the travel time between B and C, where point C is at the ball’s maximum height. Answer in units of s. 004 (part 1 of 2) 10.0 points A ball is thrown upward. Its initial verti- cal speed v 0 , acceleration of gravity g , and maximum height h max are shown in the figure below. Neglect: Air resistance. The acceleration of gravity is 9 . 8 m / s 2 . v 0 9 . 8 m / s 2 h max What is its maximum height, h max (in terms of the initial speed v 0 )? 1. h max = v 2 0 2 g 2. h max = 5 v 2 0 2 2 g 3. h max = v 2 0 2 g 4. h max = 3 v 2 0 2 g 5. h max = 3 v 2 0 2 2 g 6. h max = v 2 0 g 7. h max = 5 v 2 0 8 g 8. h max = v 2 0 4 g 9. h max = 3 v 2 0 4 g 005 (part 2 of 2) 10.0 points Find the speed v A of the ball (in terms of the initial speed v 0 ) as the ball passes a point A , which is at one quarter of the maximum height h max 4 . 1. v A = v 0 4 2. v A = v 0 2
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Niu (qn269) – HW02 – Tsoi – (58020) 2 3. v A = v 0 2 4. v A = 5 v 0 8 5. v A = 3 v 0 2 6. v A = 3 v 0 8 7. v A = 5 v 0 2 2 8. v A = 3 v 0 2 2 9. v A = 3 v 0 4 006 10.0 points
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