Thermodynamics

unknown density is poured into one side, and the water levelrises a certain amount on the other side to compensate forthis effect. Based on the final fluid heights shown on the figure,determine the density of the fluid added. Assume theliquid does not mix with water.1–76 Consider a double-fluid manometer attached to an airpipe shown in Fig. P1–76. If the specific gravity of one fluidis 13.55, determine the specific gravity of the other fluid forthe indicated absolute pressure of air. Take the atmosphericpressure to be 100 kPa. Answer: 5.0Chapter 1 | 451–78 A multifluid container is connected to a U-tube, asshown in Fig. P1–78. For the given specific gravities andfluid column heights, determine the gage pressure at A. Alsodetermine the height of a mercury column that would createthe same pressure at A. Answers: 0.471 kPa, 0.353 cm70 cmOilSG = 0.90AAirP = 76 kPa40 cm30 cm20 cmWaterGlycerinSG = 1.2690 cmSG 222 cm15 cmSG 1 = 13.55FIGURE P1–78AirFIGURE P1–761–77 Consider the system shown in Fig. P1–77. If a changeof 0.7 kPa in the pressure of air causes the brine–mercuryinterface in the right column to drop by 5 mm in the brinelevel in the right column while the pressure in the brine piperemains constant, determine the ratio of A 2 /A 1 .Solving Engineering Problems and EES1–79C What is the value of the engineering software packagesin (a) engineering education and (b) engineering practice?1–80 Determine a positive real root of this equationusing EES:2x 3 10x 0.5 3x 31–81 Solve this system of two equations with twounknowns using EES:x 3 y 2 7.753xy y 3.5Area, A 1WaterMercurySG = 13.56Area, A 2BrinepipeSG = 1.11–82 Solve this system of three equations with threeunknowns using EES:2x y z 53x 2 2y z 2xy 2z 81–83 Solve this system of three equations with threeunknowns using EES:x 2 y z 1x 3y 0.5 xz 2FIGURE P1–77x y z 2