problem02_57 solution

University Physics with Modern Physics with Mastering Physics (11th Edition)

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2.57: Denote the times, speeds and lengths of the two parts of the trip as t 1 and t 2 , v 1 and v 2 , and l 1 and l 2. a) The average speed for the whole trip is ( 29 ( 29 h, km 82 ) km 34 ( km) 76 ( ) ( ) ( h km 72 km 34 h km 88 km 76 2 2 1 1 2 1 2 1 2 1 = + + = + + = + + v l v l l l t t l l or 82.3 km/h, keeping an extra significant figure. b) Assuming nearly straight-line motion (a common feature of Nebraska
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Unformatted text preview: highways), the total distance traveled is l 1 – l 2 and ( 29 ( 29 . h km 31 ) km 34 ( km) 76 ( h km 72 km 34 h km 88 km 76 2 1 2 1 ave = +-= +-= t t l l v ( hr km 4 . 31 to three significant figures.)...
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