physics QUIZ3

# physics QUIZ3 - v = x R g 2 h =(10 m r 10 m s 2 2(10 m = 10...

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Version 022/AABBC – QTest #3 – Antoniewicz – (57380) 1 This print-out should have 2 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A target lies ±at on the ground 10 m From the side oF a building that is 10 m tall, as shown below. The acceleration oF gravity is 10 m / s 2 . Air resistance is negligible. A student rolls a 10 kg ball o² the horizontal rooF oF the building in the direction oF the target. 10 m 10 m v The horizontal speed v with which the ball must leave the rooF iF it is to strike the target is most nearly 1. v = 5 2 m/s. correct 2. v = 3 10 m/s. 3. v = 10 3 m/s. 4. v = 10 3 3 m/s. 5. v = 2 10 m/s. 6. v = 5 10 m/s. 7. v = 10 5 m/s. 8. v = 2 10 m/s. 9. v = 10 2 m/s. 10. v = 3 10 m/s. Explanation: m = 10 kg , not required h = 10 m , x = 10 m , and g = 10 m / s 2 . Observe the motion in the vertical direction only and it is a purely 1-dimension movement with a constant acceleration. So the time need For the ball to hit the ground is t = r 2 h g and the horizontal speed should be v = x t For the ball to hit the target. ThereFore

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Unformatted text preview: v = x R g 2 h = (10 m) r 10 m / s 2 2 (10 m) = 10 √ 2 m / s = 5 √ 2 m / s . 002 10.0 points A man can throw a ball a maximum horizontal distance oF 90 . 7 m. The acceleration oF gravity is 9 . 8 m / s 2 . How Far can he throw the same ball verti-cally upward with the same initial speed? 1. 45.35 2. 82.5 3. 62.0 4. 54.5 5. 69.0 6. 59.5 7. 66.5 8. 76.5 9. 90.5 10. 88.0 Version 022/AABBC – QTest #3 – Antoniewicz – (57380) 2 Correct answer: 45 . 35 m. Explanation: The range of a particle is given by the ex-pression R = v 2 sin 2 θ g . The maximum horizontal distance is obtained when the ball is thrown at an angle θ = 45 ◦ and sin 2 θ = 1 . Solving for v , v = r g R . When the ball is thrown upward with this speed, the maximum height is obtained from the equation v 2 f = v 2-2 g h . Let v f = 0, and solve for h h = v 2 2 g ....
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physics QUIZ3 - v = x R g 2 h =(10 m r 10 m s 2 2(10 m = 10...

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