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QTest #11-solutions

# QTest #11-solutions - weight oF the object because it is...

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Version 019/AABAD – QTest #11 – Antoniewicz – (57420) 1 This print-out should have 3 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A pulse moves on a string at 1 m/s, traveling to the right. At point A , the string is tightly clamped and cannot move. 1 m/s 1 m A Which oF the Following shows how the string would look soon aFter 2 seconds? 1. A 2. A 3. A 4. A 5. A 6. A 7. A 8. A correct Explanation: The pulse travels to the right and is re- ±ected back From the fxed point. The wave cannot propagate to the right beyond the point A . Re±ected pulses From fxed end points are inverted. 002 10.0 points A wedge-shaped piece oF wood ±oats in water with the widest part on the bottom and the narrowest part on top. water IF we want the wood to displace the least amount oF water, what should we do? 1. Turn it over. 2. It doesn’t matter. correct 3. Leave it as is. 4. Rotate it 90 . Explanation: It makes no di²erence which way the ob- ject is turned. The buoyant Force equals the

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Unformatted text preview: weight oF the object because it is ±oating, so the amount oF displaced ±uid is the same. 003 10.0 points Two identical strings are stretched such that the frst harmonic oF the frst string has the same Frequency as the second harmonic oF the second string. What is the ratio F 1 F 2 oF the tension Force in the frst string to that oF the second string? 1. F 1 F 2 = 8 2. F 1 F 2 = 4 correct Version 019/AABAD – QTest #11 – Antoniewicz – (57420) 2 3. F 1 F 2 = 1 4. F 1 F 2 = 2 5. F 1 F 2 = 1 16 6. F 1 F 2 = 1 4 7. F 1 F 2 = 1 2 8. F 1 F 2 = 1 8 9. F 1 F 2 = 16 10. F 1 F 2 = √ 2 Explanation: Call the length of both strings L and their mass densities per unit length μ . The wave speed is v = λ f = 2 L n f n , where n is an integer and v = r F μ , where F is the tension in the string, so the tension force is F = μ v 2 = μ p 2 L n P 2 f 2 n ∝ 1 n and F 1 F 2 = p n 2 n 1 P 2 = p 2 1 P 2 = 4 ....
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QTest #11-solutions - weight oF the object because it is...

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