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81204hw10 - Zzztayloe Rex m Homework 10 Heinz 81204 1 This...

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Unformatted text preview: Zzztayloe, Rex m Homework 10 Heinz * 81204 - Oct 12, 2004 1 This printwout should have 15 questions. Multiple—choice questions may continue on the next coiurnn or page u find all choices before answering. The due time is Centrai time. 001 (part 1 of 1) 10 points A 1.2 m wide by 2.0 in long water bed weighs 1084 N. Find the pressure that the water bed exerts on the floor. Assume that the entire lower surface of the bed makes contact with the floor. Answer in units of Pa. 002 (part 1 of 1) 10 points A piston A has a diameter of 0.79 cm, as shown. A second piston B has a diameter of 3.2 cm. In the absence of friction, determine the force F necessary to support the 440.2 N weight. Answer in units of 003 (part 1 of 2) 5 points A submarine is at an ocean depth of 178 in. Assume that the density of sea water is 1.025 X 103 lag/In3 and the atmospheric pressure is 1.01 x 105 Pa. The acceleration of gravity is 9.81 III/82 . a) Calcuiate the absolute pressure at this depth. Answer in units of Pa. 004 (part 2 of 2) 5 points 13) Calculate the magnitude of the force ex— erted by the water at this depth on a cirm cuiar submarine window with a diameter of 27.9 cm. Answer in units of 005 (part 1 of 1) 10 points E The acceieration of gravity is 9.8} m/s2 . Caicuiate the depth in the ocean at which the pressure is three times atmospheric pres— sure. Answer in units of In. 006 (part 1 of 1) 10 points A 4.8 kg rectangular air mattress is 2.34 m long, 1.26 m wide, and 0.145 m thick. What mass can it support in water before sinking? Answer in units of kg. 007 (part 1 of 2) 5 points ‘ A 0.0 kg beaker containing 2.2 kg of oii with a density of 94? lcg/rn3 rests on a scale. A 1.9 kg block of iron with a densitygof 7860 kg/m3 is suspended from a spring scale and completely submerged in the oil, as shown. The acceleration of gravity is 9.81 Iii/52 . 21) Find the equilibrium reading of the spring scaie (the upper scale). Answer in units of N. 008 (part 2 of 2) 5 points 1)) F'nd the equiiibriurn reading of the lower scale. Answer in units of N. 009 (part 1 of 2) 5 points The wind blows with a speed of 27.9 m / s over the roof of your house. 3) Assuming the air inside the house is rei— Zzztayloe, Rex * Homework 10 — Heinz * 81204 M Oct 12, 2084 atively stagnant, what is the pressure differ— ence at the roof between the inside air and the outside air? Answer in units of Pa. 010 (part 2 of 2) 5 points 1)) What net force does this pressure difierence produce on a roof having an area of 128 m2? Answer in units of 011 (part 1 of 2) 5 points A large storage tank, open to the atmosphere at the top and filled with water, develops a small hole in its side at a point 13 m below the water level. The rate of flow of water from the ieak is 2.2 X 10‘3 InB/rnin. The acceleration of gravity is 9.81 133/52 . a) Determine the speed at which the water leaves the hole. Answer in units of In/s. 012 (part 2 of 2) 5 points is) Determine the diameter of the hole. An- swer in units of in. 013 (part 1 of 2) 5 points A liquid with a density of 1.59 X 103 kg/m3 flows through two horizontal sections of tub~ ing joined end to end. In the first section, the crosswsectional area is 10.4 c1112, the flow speed is 279 cm/s, and the pressure is 1.31 x 105 Pa. In the second section, the cross—sectional area is 2.65 c1112. a) Calculate the flow speed in the smaller section. Answer in units of rn/s. 014 (part 2 of 2) 5 points 1)) Calculate the pressure in the smaller sec— tion. Answer in units of Pa. {315 (part 1 of 1) 10 points The approximate inside diameter of the aorta is 1.6 cm, and that of a capillary is 1.0 X 1045 In. The average flow speed is about 1.0 m/s in the aorta and 1.0 cm/s in the capiilaries. If ail the blood in the aorta eventuallj,r flows through the capillaries, estimate the number of capillaries in the circulatory system. ...
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