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Unformatted text preview: ouseph (jao888) HW09 tsoi (92940) 1 This print-out should have 19 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 medic applies a force of 65 N to a 0 . 02 m 2 area that is bleeding. What pressure did she apply? Correct answer: 3250 Pa. Explanation: Let : F = 65 N and A = 0 . 02 m 2 . P = F A = 65 N . 02 m 2 = 3250 Pa . 002 (part 2 of 2) 10.0 points What is this pressure in pounds per square inch? Correct answer: 0 . 471773 lb / in 2 . Explanation: P = (3250 Pa) . 225 lb N (0 . 0254 m) 2 (1 in) 2 = . 471773 lb / in 2 . 003 10.0 points The four tires of an automobile are inflated to a gauge pressure of 2 . 22 10 5 Pa. Each tire has an area of 0 . 0213 m 2 in contact with the ground. Determine the weight of the automobile. Correct answer: 18914 . 4 N. Explanation: Let : A 1 = 0 . 0213 m 2 and P = 2 . 22 10 5 Pa . Each tire supports one-fourth of the weight, so P = F A 1 = W 4 A 1 W = 4 A 1 P = 4 (0 . 0213 m 2 )(2 . 22 10 5 Pa) = 18914 . 4 N . 004 10.0 points A simple U-tube that is open at both ends is partially filled with a heavy liquid of density 1000 kg / m 3 . A liquid of density 761 kg / m 3 is then poured into one arm of the tube, forming a column 9 . 4 cm in height, as shown. h 9 . 4 cm light liquid 761 kg / m 3 heavy liquid 1000 kg / m 3 What is the difference in the heights of the two liquid surfaces? Correct answer: 2 . 2466 cm. Explanation: Let : = 9 . 4 cm , = 761 kg / m 3 , and h = 1000 kg / m 3 . Because the liquid in the U-tube is static, the pressure exerted by the heavy liquid col- umn of height - h in the left branch of the tube must balance the pressure exerted by the liquid of height h poured into the right branch, so P + ( - h ) h g = P + g . ouseph (jao888) HW09 tsoi (92940) 2 h = parenleftbigg 1- h parenrightbigg = (9 . 4 cm) parenleftbigg 1- 761 kg / m 3 1000 kg / m 3 parenrightbigg = 2 . 2466 cm . 005 10.0 points When an air bubble rises in water, what hap- pens to its mass, volume, and density? 1. Mass doesnt change; volume increases and density decreases. correct 2. All three are conserved. 3. Volume doesnt change; mass and desnisty increase. 4. Density doesnt change; mass and volume decrease. 5. Mass doesnt change; volume decreases and density increases. 6. Volume doesnt change; mass and density decrease. 7. Density doesnt change; mass and volume increase. Explanation: d = m V The mass will not change (Boyles Law). The bubbles pressure decreases so its vol- ume increases and the density decreases (same mass, smaller volume)....
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This note was uploaded on 07/09/2011 for the course PHY 302 taught by Professor Staff during the Summer '08 term at University of Texas.

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solution_9 - ouseph(jao888 HW09 tsoi(92940 1 This print-out...

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