Homework_1 - oneal (jo7344) Homework1 Storr (37517) This...

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o’neal (jo7344) – Homework1 – Storr – (37517) 1 This print-out should have 19 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A rocket initially at rest accelerates at a rate oF 70 m / s 2 For 0 . 81 min. What is its speed at the end oF this time? Correct answer: 3402 m / s. Explanation: Let : a = 70 m / s 2 and t = 0 . 81 min . v f = v o + a t = a t = (70 m / s 2 ) (0 . 81 min) 60 s 1 min = 3402 m / s . 002 (part 1 oF 2) 10.0 points A glacier advances at 6 . 3 × 10 - 6 cm / s. How Far will it move in 66000 s? Correct answer: 0 . 4158 cm. Explanation: Let : v = 6 . 3 × 10 - 6 cm / s and t = 66000 s . s = v t = (6 . 3 × 10 - 6 cm / s) (66000 s) = 0 . 4158 cm . 003 (part 2 oF 2) 10.0 points How Far will it move in 6 . 9 y? Correct answer: 1370 . 87 cm. Explanation: s = v t = (6 . 3 × 10 - 6 cm / s) (6 . 9 y) × 365 d 1 y 24 h 1 d 3600 s 1 h = 1370 . 87 cm . 004 10.0 points The Earth’s radius is about 6380 km. The space shuttle is orbiting about 271.8 km above Earth’s surFace. IF the average speed oF the space shuttle is 28800 km / h, fnd the time required For it to circle Earth. Correct answer: 1 . 4512 h. Explanation: Let : v avg = 28800 km / h , r Earth = 6380 km , and Δ y = 271 . 8 km . The circumFerence oF the orbit is C = 2 π r orbit , so Δ t = C v avg = 2 π ( r Earth + Δ y ) v avg = 2 π (6380 km + 271 . 8 km) 28800 km / h = 1 . 4512 h . 005 10.0 points A baseball goes From zero to 37 m / s in 0 . 191 s. What is its average acceleration? Correct answer: 193 . 717 m / s 2 . Explanation: Let : v f = 37 m / s , v 0 = 0 m / s , and t = 0 . 191 s .
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o’neal (jo7344) – Homework1 – Storr – (37517) 2 a = Δ v Δ t = v f - v 0 t = 37 m / s - 0 m / s 0 . 191 s = 193 . 717 m / s 2 006 10.0 points A four-engine jet accelerates down the runway at 3 m / s 2 . If one of the jet engines fails, how much acceleration will the other three produce? Correct answer: 2
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This note was uploaded on 02/21/2010 for the course PHYS 2513 taught by Professor Staff during the Spring '08 term at Prairie View A & M.

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Homework_1 - oneal (jo7344) Homework1 Storr (37517) This...

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