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# 10 - homework 11 JACOBS AMBER Due 1:00 am Question 1 chap...

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homework 11 – JACOBS, AMBER – Due: Apr 22 2008, 1:00 am 1 Question 1, chap 15, sect 6. part 1 of 3 10 points A pendulum that moves through its equilib- rium position once every 1.000 s is sometimes called a “seconds pendulum.” a) What is the period of any seconds pen- dulum? 1. 4.000 s 2. None of these 3. 2.000 s correct 4. 0.250 s 5. 1.000 s 6. 0.500 s Explanation: Basic Concept: A pendulum passes through its equilibrium position twice each cycle. Solution: T = 2(1 . 000 s) = 2 . 000 s Question 2, chap 15, sect 6. part 2 of 3 10 points In Cambridge, England, a seconds pendu- lum is 0.9942 m long. b) What is the free-fall acceleration in Cam- bridge? 1. None of these 2. 9 . 81236 m / s 2 correct 3. 9 . 81341 m / s 2 4. 9 . 79552 m / s 2 5. 9 . 81 m / s 2 6. 9 . 79657 m / s 2 Explanation: Basic Concept: T = 2 π radicalBigg L g Solution: parenleftbigg T 2 π parenrightbigg 2 = L g g 1 = L 1 parenleftbigg 2 π T parenrightbigg 2 = (0 . 9942 m) parenleftbigg 2 π 2 s parenrightbigg 2 = 9 . 81236 m / s 2 Question 3, chap 15, sect 6. part 3 of 3 10 points In Tokyo, Japan, a seconds pendulum is 0.9926 m long. c) What is the free-fall acceleration in Tokyo? 1. None of these 2. 9 . 81 m / s 2 3. 9 . 79552 m / s 2 4. 9 . 79657 m / s 2 correct 5. 9 . 81341 m / s 2 6. 9 . 81236 m / s 2 Explanation: Solution: g 2 = L 2 parenleftbigg 2 π T parenrightbigg 2 = (0 . 9926 m) parenleftbigg 2 π 2 s parenrightbigg 2 = 9 . 79657 m / s 2 Question 4, chap 15, sect 7. part 1 of 3 10 points

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