HW5 Fall09 - PHY 317K HOMEWORK # 5 DUE on November 16, 2009...

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PHY 317K HOMEWORK # 5 DUE on November 16, 2009 by 8:00pm Instructions: Use a UT ANSWER SHEET to mark answers. Provide your NAME (last, first), UTEID , and UNIQUE NUMBER of the course. Sign and date it. The answer sheets must be placed in the 317K box located outside PAI 2.48. Late homework will not be graded . Answer the following 34 questions: 1. To measure moderately low pressures, oil with a density of 8.5 × 10 2 kg/m 3 is used in place of mercury in a barometer. A change in the height of the oil column of 1.0 mm indicates a change in pressure of about: A) 1.2 × 10 –7 Pa B) 1.2 × 10 –5 Pa C) 0.85 Pa D) 1.2 Pa E) 8.3 Pa 2. The vessels shown below all contain water to the same height. Rank them according to the pressure exerted by the water on the vessel bottoms, least to greatest. A) 1, 2, 3, 4 B) 3, 4, 2, 1 C) 4, 3, 2, 1 D) 2, 3, 4, 1 E) All pressures are the same Page 1
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3. The density of water is 1.0 g/cm 3 . The height h of the oil in the left column is 5.0 cm. The density of the oil in the left column of the U-tube shown below is: A) 0.50 g/cm 3 B) 0.60 g/cm 3 C) 0.75 g/cm 3 D) 0.80 g/cm 3 E) 1.1 g/cm 3 4. A particular object floats in fluids of density 1. 0.9 ρ 0 2. 0 3. 1.1 0 Rank these fluids according to the volume displaced by the object, least to greatest. A) 1, 2, 3 B) 3, 2, 1 C) 2, 3, 1 D) 3, 1, 2 E) All are the same 5. An object hangs from a spring balance. The balance indicates 30 N in air, and 20 N when the object is submerged in water.What does the balance indicate when the object is submerged in liquid with a density that has half the density of water?: A) 20 N B) 25 N C) 30 N D) 35 N E) 40 N Page 2
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6. A hydraulic press has one piston of diameter 2.0 cm and the other piston of diameter 8.0 cm. What force must be applied to the smaller piston to obtain a force of 1600 N at the larger piston: A) 6.25 N B) 25 N C) 100 N D) 400 N E) 1600 N 7. A long U-tube contains mercury (density = 14 × 10 3 kg/m 3 ). When 10 cm of water (density = 1.0 × 10 3 kg/m 3 ) is poured into the left arm, the mercury in the right arm rises above its original level by: A) 0.36 cm B) 0.72 cm C) 14 cm D) 35 cm E) 70 cm 8. A boat floating in fresh water displaces 16,000 N of water. How many newtons of salt water would it displace if it floats in salt water of specific gravity 1.17? A) 14,500 B) 17,600 C) 16,000 D) 284 E) 234 9. A block of wood weighs 160 N and has a specific gravity of 0.60. To sink it in pure water requires an additional downward force of: A) 54 N B) 64 N C) 96 N D) 110 N E) 240 N Page 3
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10. A uniform U-tube is partially filled with water. Oil, of density 0.75 g/cm
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This note was uploaded on 12/02/2009 for the course PHY 317k taught by Professor Kopp during the Spring '07 term at University of Texas at Austin.

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HW5 Fall09 - PHY 317K HOMEWORK # 5 DUE on November 16, 2009...

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