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Unformatted text preview: white (rw22679) Hw09 Ross (10219) 1 This print-out should have 14 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points How fast must a meter stick be moving if its length is observed to shrink to 0 . 26 m? Correct answer: 0 . 965609 c. Explanation: Given : L p = 1 m and L = 0 . 26 m . The contracted length is L = L p radicalbigg 1- parenleftBig v c parenrightBig 2 L 2 L 2 p = 1- parenleftBig v c parenrightBig 2 v = c radicalBigg 1- parenleftbigg L L p parenrightbigg 2 = c radicalBigg 1- parenleftbigg . 26 m 1 m parenrightbigg 2 = . 965609 c . 002 (part 1 of 3) 10.0 points A spaceship travels with a speed of 0 . 6 c as it passes by the Earth on its way to a distant star, as shown in the diagram below. The pilot of the spaceship measures the length of the moving ship as 40 m. . 6 c Earth Determine its length as measured by a per- son on Earth. Correct answer: 32 m. Explanation: Let : L = 40 m and v = 0 . 6 c . Applying length contraction, L = L = L radicalBigg 1- v 2 c 2 = (40 m) radicalbigg 1- (0 . 6 c ) 2 c 2 = 32 m . 003 (part 2 of 3) 10.0 points The pilot of the spaceship observes that the spaceship travels for 6 years. Determine how much time has passed ac- cording to a person on Earth. Correct answer: 7 . 5 years....
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This note was uploaded on 12/01/2010 for the course PHYSICS 21900 taught by Professor Rhoads during the Spring '10 term at IUPUI.
- Spring '10