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HW01-solutions - burgin(lcb626 HW01 markert(56480 This...

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burgin (lcb626) – HW01 – markert – (56480) 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 4) 10.0 points How many significant figures are in 65 . 8 ± 0 . 2 m? 1. 5 2. 1 3. 2 4. 3 correct 5. 4 6. None of these 7. 6 Explanation: Addition or subtraction of values measured in tenths of a meter are to be rounded to the nearest tenth of a meter. 002 (part 2 of 4) 10.0 points How many significant figures are in 2 . 567 × 10 18 s? 1. 3 2. 1 3. 5 4. 4 correct 5. 2 6. None of these 7. 6 Explanation: Every digit in scientific notation is signifi- cant. 003 (part 3 of 4) 10.0 points How many significant figures are in 2 . 43 × 10 10 kg? 1. 6 2. 5 3. 3 correct 4. 2 5. 4 6. 1 7. None of these Explanation: Every digit in scientific notation is signifi- cant. 004 (part 4 of 4) 10.0 points How many significant figures are in 0 . 0059 mm? 1. 1 2. 2 correct 3. 3 4. 5 5. 4 6. None of these 7. 6 Explanation: The first non-zero digit is the first signifi- cant digit. 005 10.0 points Convert an acceleration of 3 . 1 mi / h / s to m / s 2 . Correct answer: 1 . 38553 m / s 2 . Explanation:
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burgin (lcb626) – HW01 – markert – (56480) 2 Let : a = 3 . 1 mi / h / s . a = 3 . 1 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 1 . 38553 m / s 2 . 006 (part 1 of 2) 10.0 points The elevators in the John Hancock building in Chicago move 678 ft in 36 s. What is their speed? Correct answer: 5 . 7404 m / s. Explanation: v = 678 ft 36 s parenleftbigg 12 in 1 ft parenrightbiggparenleftbigg 2 . 54 cm 1 in parenrightbigg × parenleftbigg 1 m 100 cm parenrightbigg = 5 . 7404 m / s .
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