# HW22 - schneiter (tcs639) – HW22 – Ross – (89152) 1...

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Unformatted text preview: schneiter (tcs639) – HW22 – Ross – (89152) 1 This print-out should have 8 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 In a car lift used in a service station, com- pressed air exerts a force on a small piston of circular cross-section having a radius of 4 . 18 cm. This pressure is transmitted by a liquid to a second piston of radius 24 . 2 cm. What force must the compressed air exert in order to lift a car weighing 11700 N? Correct answer: 349 . 066 N. Explanation: Let : r 1 = 4 . 18 cm , r 2 = 24 . 2 cm , and F 2 = 11700 N . Because the pressure exerted by the compressed air is transmitted undiminished throughout the fluid, we have F 1 A 1 = F 2 A 2 F 1 = parenleftbigg A 1 A 2 parenrightbigg F 2 = parenleftbigg π r 2 1 π r 2 2 parenrightbigg F 2 = π (4 . 18 cm) 2 π (24 . 2 cm) 2 (11700 N) = 349 . 066 N . 002 (part 2 of 2) 10.0 points What air pressure will produce this force? Correct answer: 63592 . 4 Pa. Explanation: P = F 1 A 1 = F 1 π r 2 1 = 349 . 066 N π (24 . 2 cm) 2 · parenleftbigg 100 cm 1 m parenrightbigg 2 = 63592 . 4 Pa . 003 (part 1 of 2) 10.0 points Calculate the pressure at an ocean depth of 1370 m. The acceleration of grav- ity is 9 . 8 m / s 2 , atmospheric pressure is...
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## This note was uploaded on 04/23/2009 for the course PHYS 152 taught by Professor Button during the Spring '08 term at IUPUI.

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HW22 - schneiter (tcs639) – HW22 – Ross – (89152) 1...

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