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Unformatted text preview: gonzalez (ng4897) – homework 01 – Turner – (58120) 1 This printout should have 12 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A block of material has dimensions 3 . 2 cm by 8 . 8 cm by 2 . 3 cm. Its mass is 585 g. What is the density? Correct answer: 9 . 03224 g / cm 3 . Explanation: Let : ℓ = 8 . 8 cm , w = 3 . 2 cm , h = 2 . 3 cm , and m = 585 g . Density is mass per unit volume, so ρ = m V = m ℓ w h = 585 g (8 . 8 cm)(3 . 2 cm)(2 . 3 cm) = 9 . 03224 g / cm 3 . 002 10.0 points Convert an acceleration of 4 . 5 mi / h / s to m / s 2 . Correct answer: 2 . 01125 m / s 2 . Explanation: Let : a = 4 . 5 mi / h / s . a = 4 . 5 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 2 . 01125 m / s 2 . 003 10.0 points Convert 47 ◦ to radians. Correct answer: 0 . 820305 rad. Explanation: Since π rad = 180 ◦ , 47 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 820305 rad . 004 10.0 points Find the area of a rectangular building lot that is 145 ft by 80 ft. Correct answer: 1077 . 68 m 2 . Explanation: Let : ℓ = 145 ft and w = 80 ft . A = ℓ w = (145 ft) (80 ft) parenleftbigg 12 in 1 ft parenrightbigg 2 × parenleftbigg 2 . 54 cm 1 in parenrightbigg 2 parenleftbigg 1 m 100 cm parenrightbigg 2 = 1077 . 68 m 2 . Alternate conversions factors are 1 m = 3.281 ft and 0.3048 m = 1 ft, which would also have to be squared....
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 Spring '10
 GORDITO

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