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Unformatted text preview: 1. /3 points Walker4 29.P.012. My Notes | An elementary particle called a pi meson (or pion for short) has an average lifetime of 2.6 10-8 s when at rest. Suppose that a pion moves with a speed of 0.995 c relative to Earth. (a) Find the average lifetime of the pion as measured by an observer on Earth. s (b) Find the average distance traveled by the pion as measured by the same observer. m (c) How far would the pion have traveled relative to Earth if relativistic time dilation did not occur? m 2. /4 points Walker4 29.P.014. My Notes | (a) Is it possible for you to travel far enough and fast enough so that when you return from a trip, you are younger than your stay-at-home sister, who was born 5.0 y after you? Yes, provided you travel via a 'wormhole' No, you will always return more than 5.0 y older than her Yes, due to time dilation No, you will always return 5.0 y older than her (b) Suppose you fly on a rocket with a speed v = 0.91 c for 4.0 y, according to the ship's clocks and calendars. How much time elapses on Earth during your 4.0 y trip? y (c) If you were exactly 22 y old when you left home and your sister was precicely 17, what are your ages when you return? (Do not round your answers to the nearest year.) your age y your sister's age y 3. /1 points Walker4 29.P.016. My Notes | An observer moving toward Earth with a speed of 0.97 c notices that it...
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- Fall '08