PHY303k_-_Spring_2010_-_HW_1

PHY303k_-_Spring_2010_-_HW_1 - saldana (avs387) –...

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Unformatted text preview: saldana (avs387) – Homework 01 – florin – (58140) 1 This print-out should have 15 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 (part 1 of 2) 10.0 points The distance between the sun and the Earth is about 1 . 5026 × 10 11 m. Express this distance with an SI prefix. 1. 1 . 5026 × 10 − 1 Pm 2. 1 . 5026 × 10 − 1 km 3. 1 . 5026 × 10 − 1 Mm 4. 1 . 5026 × 10 − 1 Tm correct 5. 1 . 5026 × 10 − 1 Gm 6. None of these 7. 1 . 5026 × 10 − 1 mm Explanation: 1 Tm = 1 × 10 12 m , so d = ( 1 . 5026 × 10 11 m ) · 1 Tm 1 × 10 12 m = 1 . 5026 × 10 − 1 Tm . 002 (part 2 of 2) 10.0 points Express this distance in kilometers. 1. 1 . 5026 × 10 9 km 2. 1 . 5026 × 10 11 km 3. 1 . 5026 × 10 10 km 4. None of these 5. 1 . 5026 × 10 6 km 6. 1 . 5026 × 10 7 km 7. 1 . 5026 × 10 8 km correct Explanation: 1 km = 1 × 10 3 m , so d = ( 1 . 5026 × 10 11 m ) · 1 km 1 × 10 3 m = 1 . 5026 × 10 8 km . 003 10.0 points A block of material has dimensions 4 cm by 8 . 9 cm by 4 . 6 cm. Its mass is 636 g. What is the density? Correct answer: 3 . 88373 g / cm 3 . Explanation: Let : ℓ = 8 . 9 cm , w = 4 cm , h = 4 . 6 cm , and m = 636 g . Density is mass per unit volume, so ρ = m V = m ℓ w h = 636 g (8 . 9 cm)(4 cm)(4 . 6 cm) = 3 . 88373 g / cm 3 . 004 10.0 points Convert an acceleration of 2 . 6 mi / h / s to m / s 2 . Correct answer: 1 . 16206 m / s 2 . Explanation: Let : a = 2 . 6 mi / h / s . a = 2 . 6 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 1 . 16206 m / s 2 . 005 10.0 points Convert 13 ◦ to radians. Correct answer: 0 . 226893 rad. saldana (avs387) – Homework 01 – florin – (58140) 2 Explanation: Since π rad = 180 ◦ , 13 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 226893 rad ....
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This note was uploaded on 08/30/2010 for the course PHY 58140 taught by Professor Florin during the Spring '10 term at University of Texas.

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PHY303k_-_Spring_2010_-_HW_1 - saldana (avs387) –...

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