homework 10

# homework 10 - montes(dam2772 – Homework10 – shih...

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Unformatted text preview: montes (dam2772) – Homework10 – shih – (56310) 1 This print-out should have 10 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A spaceship is measured to be 115 m long while at rest relative to the observer. If this spaceship now flies by the observer with a speed 0 . 871 times the speed of light, what length does the observer measure? Correct answer: 56 . 4975 m. Explanation: Let : L p = 115 m and v = 0 . 871 c. If L p is the proper length of the moving object, the length of the spacecraft measured by the observer is L = L p radicalbigg 1- v 2 c 2 = (115 m) radicalBig 1- (0 . 871) 2 = 56 . 4975 m . 002 10.0 points Prudence and Charity are twins raised at the center of a rotating kingdom. Charity goes to live at the edge of the kingdom for a time and then returns home. Which twin is older when they rejoin? (Ig- nore any time-dilation effects associated with travel to and from the edge.) 1. Charity 2. Prudence correct 3. More information is needed. 4. There will be no difference. Explanation: Prudence is older. Charity’s time runs slower during the time she is at the edge of the rotating kingdom. 003 10.0 points If stationary observers measure the shape of a passing object to be exactly circular, what is the shape of the object according to observers traveling with it?...
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homework 10 - montes(dam2772 – Homework10 – shih...

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