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Measurement-solutions

Measurement-solutions - le(txl65 Measurement mohanty(81440...

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le (txl65) – Measurement – mohanty – (81440) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points The number x = 0 . 0655 has how many signif- icant digits? Correct answer: 3. Explanation: All non-zero digits are significant. Any zeros in front of the first non-zero digit are placeholders; zeros between non-zero digits are significant. 002 10.0points Convert 82 . 3 mi / h to m/s. 1 mi = 1609 m. Correct answer: 36 . 7835 m / s. Explanation: 1 mi = 1609 m 1 h = 3600 s (82 . 3 mi / h) 1609 m 1 mi · 1 h 3600 s = 36 . 7835 m / s . 003(part1of2)10.0points The elevators in the John Hancock building in Chicago move 747 ft in 41 s. What is their speed? Correct answer: 5 . 55331 m / s. Explanation: v = 747 ft 41 s parenleftbigg 12 in 1 ft parenrightbigg parenleftbigg 2 . 54 cm 1 in parenrightbigg × parenleftbigg 1 m 100 cm parenrightbigg = 5 . 55331 m / s . 004(part2of2)10.0points What is this speed in miles per hour? Correct answer: 12 . 4228 mi / h. Explanation: Since 1 mi = 5280 ft and 1 h = 3600 s, v = parenleftbigg 747 ft 41 s parenrightbigg parenleftbigg 3600 s 1 h parenrightbigg parenleftbigg 1 mi 5280 ft parenrightbigg = 12 . 4228 mi / h .
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