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# solution1013 - ikram(ai2734 hw1013 Swinney(58785 This...

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ikram (ai2734) – hw1013 – Swinney – (58785) 1 This print-out should have 9 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 A small air compressor operates on a 2 . 7 hp (horsepower) electric motor for 9 . 6 hours a day. How much energy is consumed by the motor daily? 1 hp equals about 750 watts. Correct answer: 6 . 9984 × 10 7 J. Explanation: Let : P = 2 . 7 hp , and t = 9 . 6 h . P = 2 . 7 hp · 750 W hp = 2025 W = 2025 J / s , so W = P t = (2025 J / s) (9 . 6 h) · 3600 s 1 h = 6 . 9984 × 10 7 J . 002 (part 2 of 2) 10.0 points If electricity costs 12 cents per kilowatt-hour, how much does it cost to run the compressor each day? Correct answer: 233 . 28 cents. Explanation: The energy in kilowatt-hours is given by: E = P t = (2 . 025 kW) (9 . 6 h) = 19 . 44 kW · h , Cost = (19 . 44 kW · h) (12 cents / kW · h) = 233 . 28 cents . At 12 cents per kW · h, it would cost 233 . 28 cents to run the compressor for a day. keywords: 003 10.0 points When a rattlesnake strikes, its head acceler- ates from rest to a speed of 20 m / s in 0 . 33 s seconds. Assume for simplicity that the only

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solution1013 - ikram(ai2734 hw1013 Swinney(58785 This...

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