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Unformatted text preview: lai (yl8859) HW23 Ross (15200) 1 This printout should have 6 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A cowboy at a dude ranch fills a horse trough that is 1 . 3 m long, 63 cm wide, and 45 cm deep. He uses a 2 . 3 cm diameter hose from which water emerges at 2 . 1 m / s . How long does it take him to fill the trough? Correct answer: 7 . 04012 min. Explanation: Let : = 1 . 3 m , w = 63 cm = 0 . 63 m , h = 45 cm = 0 . 45 m , r = 1 . 15 cm = 0 . 0115 m , and v = 2 . 1 m / s . The crosssectional area of the hose is A = r 2 , and the flow rate is A v , so the time required to fill the trough is t = V F = w h A v = w h r 2 v = (1 . 3 m) (0 . 63 m) (0 . 45 m) (0 . 0115 m) 2 (2 . 1 m / s) parenleftbigg 1 min 60 s parenrightbigg = 7 . 04012 min . 002 10.0 points A large storage tank is filled to a height 73 cm. The tank is punctured with a small hole at a height 21 cm from the bottom of the tank....
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This note was uploaded on 02/24/2011 for the course PHYS 152 taught by Professor Button during the Winter '08 term at IUPUI.
 Winter '08
 BUTTON
 mechanics

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