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QTest #7-solutions

# QTest #7-solutions - Version 099/ABCAD QTest#7...

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Version 099/ABCAD – QTest #7 – Antoniewicz – (56445) 1 This print-out should have 4 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 5.0 points You throw a ball of mass 1 . 5 kg straight up. You observe that it takes 2 . 1 s to go up and down, returning to your hand. assuming we can neglect air resistance, the time it takes to go up to the top is half the total time, 1 . 05 s. Note that at the top, the momentum is momentarily zero, as it changes from heading upward to heading downward. Use the Momentum Principle to determine the speed that the ball had just after it left your hand. Use g = 9 . 8 m / s 2 . 1. 14.21 2. 15.68 3. 16.66 4. 10.29 5. 12.74 6. 13.23 7. 11.76 8. 10.78 9. 13.72 10. 16.17 Correct answer: 10 . 29 m / s. Explanation: We can write F net = Δ p Δ t - m g = m ( v f,y - v i,y ) Δ t - m g = 0 - m v i,y Δ t v i,y = g Δ t = ( 9 . 8 m / s 2 ) (1 . 05 s) = 10 . 29 m / s . 002 (part 2 of 2) 5.0 points Use the Energy Principle to determine the maximum height above your hand reached by the ball.

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QTest #7-solutions - Version 099/ABCAD QTest#7...

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