phyhw1 - valdez(vv689 – Homework 01 – florin –(58140...

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Unformatted text preview: valdez (vv689) – 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 . 5207 × 10 11 m. Express this distance with an SI prefix. 1. 1 . 5207 × 10 − 1 Gm 2. 1 . 5207 × 10 − 1 mm 3. None of these 4. 1 . 5207 × 10 − 1 Pm 5. 1 . 5207 × 10 − 1 Tm correct 6. 1 . 5207 × 10 − 1 Mm 7. 1 . 5207 × 10 − 1 km Explanation: 1 Tm = 1 × 10 12 m , so d = ( 1 . 5207 × 10 11 m ) · 1 Tm 1 × 10 12 m = 1 . 5207 × 10 − 1 Tm . 002 (part 2 of 2) 10.0 points Express this distance in kilometers. 1. None of these 2. 1 . 5207 × 10 6 km 3. 1 . 5207 × 10 10 km 4. 1 . 5207 × 10 8 km correct 5. 1 . 5207 × 10 7 km 6. 1 . 5207 × 10 11 km 7. 1 . 5207 × 10 9 km Explanation: 1 km = 1 × 10 3 m , so d = ( 1 . 5207 × 10 11 m ) · 1 km 1 × 10 3 m = 1 . 5207 × 10 8 km . 003 10.0 points A block of material has dimensions 4 . 2 cm by 7 . 2 cm by 4 . 8 cm. Its mass is 586 g. What is the density? Correct answer: 4 . 03715 g / cm 3 . Explanation: Let : ℓ = 7 . 2 cm , w = 4 . 2 cm , h = 4 . 8 cm , and m = 586 g . Density is mass per unit volume, so ρ = m V = m ℓ w h = 586 g (7 . 2 cm)(4 . 2 cm)(4 . 8 cm) = 4 . 03715 g / cm 3 . 004 10.0 points Convert an acceleration of 3 . 1 mi / h / s to m / s 2 . Correct answer: 1 . 38553 m / s 2 . Explanation: Let : a = 3 . 1 mi / h / s . a = 3 . 1 mi h · s · 1 . 609 km 1 mi · 1000 m 1 km · 1 h 3600 s = 1 . 38553 m / s 2 . 005 10.0 points Convert 30 . 4 ◦ to radians. Correct answer: 0 . 53058 rad. valdez (vv689) – Homework 01 – florin – (58140) 2 Explanation: Since π rad = 180 ◦ , 30 . 4 ◦ parenleftbigg π rad 180 ◦ parenrightbigg = . 53058 rad ....
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phyhw1 - valdez(vv689 – Homework 01 – florin –(58140...

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