# hw1 - This print-out should have 12 questions...

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Unformatted text preview: 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 . 9 cm by 6 . 9 cm by 6 cm. Its mass is 634 g. What is the density? Correct answer: 3 . 12531 g / cm 3 . Explanation: Density is mass per unit volume, so ρ = m V = m ℓ w h 002 10.0 points An acceleration of 5 . 9 mi / h / s is equal to Correct answer: 2 . 63697 m / s 2 . Explanation: Let : a = 5 . 9 mi / h / s . a = 5 . 9 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 2 . 63697 m / s 2 . 003 10.0 points Convert 42 . 6 ◦ to radians. Correct answer: 0 . 74351 rad. Explanation: Since π rad = 180 ◦ , 42 . 6 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 74351 rad . 004 10.0 points A rectangular building lot is 90 ft by 70 ft. Find the area of this lot. Correct answer: 585 . 289 m 2 . Explanation: Let : ℓ = 90 ft and w = 70 ft . A = ℓ w = (90 ft) (70 ft) × parenleftbigg 12 in 1 ft parenrightbigg 2 × parenleftbigg 2 . 54 cm 1 in parenrightbigg 2 × parenleftbigg 1 m 100 cm parenrightbigg 2 = 585 . 289 m 2 . Alternate conversions factors are 1 m = 3.281 ft and 0.3048 m = 1 ft. These would also have to be squared. 005 10.0 points In 1990 there were approximately 7 × 10 6 people people living in New York City. New York City has an area of approximately 8 . 31 × 10 2 square kilometers. What was the population density of New York City in 1990?...
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hw1 - This print-out should have 12 questions...

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