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Unformatted text preview: homework 01 – YOO, HEE – Due: Jan 21 2008, 4:00 am 1 Question 1, chap 1, sect 5. part 1 of 1 10 points A block of material has dimensions 3 . 9 cm by 7 . 5 cm by 2 . 3 cm. Its mass is 554 g. What is the density? Correct answer: 8 . 23486 g / cm 3 (tolerance ± 1 %). Explanation: Density is mass per unit volume, so ρ = m V = m ℓ w h Question 2, chap 1, sect 6. part 1 of 1 10 points An acceleration of 3 mi / h / s is equal to: Correct answer: 1 . 34083 m / s 2 (tolerance ± 1 %). Explanation: a = 3 mi / h / s = 3 mi h · s · 1 . 609km 1 mi · 1000 m 1 km · 1 h 3600 s = 1 . 34083 m / s 2 Question 3, chap 1, sect 6. part 1 of 1 10 points Convert 25 . 8 ◦ to radians. Correct answer: 0 . 450295 rad (tolerance ± 1 %). Explanation: Since π rad = 180 ◦ , 25 . 8 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 450295 rad . Question 4, chap 1, sect 6. part 1 of 1 10 points A rectangular building lot is 45 . 8 ft by 173 ft. Find the area of this lot in m 2 . Correct answer: 736 . 108 m 2 (tolerance ± 1 %). Explanation: Basic Concepts: Conversion of Units Area = (Length)(Width) A = Lw = (45 . 8 ft)(173 ft) = 736 . 108 m 2...
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This note was uploaded on 05/04/2008 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.
 Spring '08
 Turner
 Physics, Mass, Work

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