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Unformatted text preview: boland (kbb544) HW1 Mackie (10611) 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A piece of pipe has an outer radius of 4 . 6 cm, an inner radius of 2 . 7 cm, and length of 32 cm as shown in the figure. 3 2 c m 4 . 6 cm 2 . 7 cm b What is the mass of this pipe? Assume its density is 8 . 3 g / cm 3 . Correct answer: 11 . 5732 kg. Explanation: Let : r 1 = 4 . 6 cm , r 2 = 2 . 7 cm , = 32 cm , and = 8 . 3 g / cm 3 . V = r 2 1  r 2 2 = ( r 2 1 r 2 2 ) , so the density is = m V m = V = ( r 2 1 r 2 2 ) = (8 . 3 g / cm 3 ) [(4 . 6 cm) 2 (2 . 7 cm) 2 ] (32 cm) 1 kg 1000 g = 11 . 5732 kg . 002 10.0 points Rain drops fall on a tile surface at a density of 4094 drops / ft 2 . There are 16 tiles / ft 2 . How many drops fall on each tile? Correct answer: 255 . 875 drops / tile. Explanation: Let : = 4094 drops / ft 2 and n = 16 tiles / ft 2 . Applying dimensional analysis, R = n = 4094 drops / ft 2 16 tiles / ft 2 = 255 . 875 drops / tile . 003 10.0 points A water holding tank measures 80 m long, 50 m wide, and 12 m deep. Traces of mercury have been found in the tank, with a concen tration of 75 mg / L. What is the total mass of mercury in the tank? Correct answer: 3600 kg. Explanation: Let : = 80 m , w = 50 m , d = 12 m , and = 75 mg / L ....
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 Spring '11
 MACKIE
 Physics

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