homework 01-solutions

homework 01-solutions - greene (cg25937) – homework 01...

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Unformatted text preview: greene (cg25937) – homework 01 – Turner – (58220) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points A block of material has dimensions 4 . 5 cm by 8 . 2 cm by 5 . 3 cm. Its mass is 623 g. What is the density? Correct answer: 3 . 18556 g / cm 3 . Explanation: Let : ℓ = 8 . 2 cm , w = 4 . 5 cm , h = 5 . 3 cm , and m = 623 g . Density is mass per unit volume, so ρ = m V = m ℓ w h = 623 g (8 . 2 cm)(4 . 5 cm)(5 . 3 cm) = 3 . 18556 g / cm 3 . 002 10.0 points Convert an acceleration of 2 . 5 mi / h / s to m / s 2 . Correct answer: 1 . 11736 m / s 2 . Explanation: Let : a = 2 . 5 mi / h / s . a = 2 . 5 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 1 . 11736 m / s 2 . 003 10.0 points Convert 47 . 6 ◦ to radians. Correct answer: 0 . 830777 rad. Explanation: Since π rad = 180 ◦ , 47 . 6 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 830777 rad . 004 10.0 points Find the area of a rectangular building lot that is 195 ft by 90 ft. Correct answer: 1630 . 45 m 2 . Explanation: Let : ℓ = 195 ft and w = 90 ft . A = ℓ w = (195 ft) (90 ft) parenleftbigg 12 in 1 ft parenrightbigg 2 × parenleftbigg 2 . 54 cm 1 in parenrightbigg 2 parenleftbigg 1 m 100 cm parenrightbigg 2 = 1630 . 45 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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This note was uploaded on 03/08/2010 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.

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homework 01-solutions - greene (cg25937) – homework 01...

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