A pump is used to transport water to a higher reservoir. If the water tem- perature is 30 degrees C, determine the lowest pressure that can exist in the pump without cavitation. The vapor pressure of water at 30 degrees C is 3.35 kPa.
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- Long-term space missions require reclamation of the oxygen in the carbon dioxide exhaled by the crew. In one method of reclamation, 1.00 mol of carbon dioxide produces 1.00 mol of oxygen, with 1.00 mol of methane as a by-product. The methane is stored in a tank under pressure and is available to control the attitude of the spacecraft by controlled venting. A single astronaut exhales 1.21 kg of carbon dioxide each day. If the methane generated in the recycling of three astronauts' respiration during one week of flight is stored in an originally empty 155-L tank at −45.0°C, what is the final pressure in the tank? MPaThe spherical gas tank is fabricated by bolting together two hemispherical thin shells of thickness 30 mm. The gas contained in the tank is under a gauge pressure of 2.5 MPa. If the tank has an inner diameter of 8 m and is sealed with 900 bolts each 20 mm in diameter, determine the internal force carried by each bolt.A pressure versus volume (pV) diagram for a system is shown in the figure. The arrows of the curve indicate the direction of the process, and the points of interest are labeled. The values for the points in the diagram are shown in the table. Volume (m³) Pressure (Pa) 2 Vo = 27.8 po = 1.37 × 10ª Vi = 20.8 Pi = 1.37 × 104 V2 = 17.4 P2 = 6.18 × 10³ V3 = 13.9 P3 = 6.18 × 10³ V4 = 13.9 P4 = 2.64 x 103 Vs = 8.87 p5 = 1.00 x 10³ Volume (m) Calculate the amount of work done on the system from 0–2 (Wm) and then for the entire curve from 0-5 (Wos). Pressure (Pa)
- The figure below shows a gas contained in a vertical piston–cylinder assembly. A vertical shaft whose cross-sectional area is 0.8 cm2 is attached to the top of the piston. Determine the magnitude, F, of the force acting on the shaft, in N, required if the gas pressure is 3 bar. The masses of the piston and attached shaft are 24.5 kg and 0.5 kg, respectively. The piston diameter is D = 10 cm. The local atmospheric pressure is 1 bar. The piston moves smoothly in the cylinder and g = 9.81 m/s2.One mole of oxygen gas is at Three arterial geometries are shown in the figure, including a healthy blood vessel (i), a constricted blood vessel (ii), and a blood vessel with an aneurysm (a balloon-like bulge; (iii)). The speed of the blood at point ① in all three vessels is 40.0 cm/s.a pressure of 9.00 atm and a temperature of 38.0°C.Membrane Servo-controlled Arm А В Patm Piston
- Water at 15°C is to be pumped from a reservoir (zA = 2 m) to another reservoir at a higher elevation (zB = 9 m) through two 25-m-long plastic pipes connected in parallel. The diameters of the two pipes are 3 cm and 5 cm. Water is to be pumped by a 68 percent efficient motor–pump unit that draws 8 kW of electric power during operation. The minor losses and the head loss in the pipes that connect the parallel pipes to the two reservoirs are considered to be negligible. Determine the total flow rate between the reservoirs and the flow rates through each of the parallel pipes.Long-term space missions require reclamation of the oxygen in the carbon dioxide exhaled by the crew. In one method of reclamation, 1.00 mol of carbon dioxide produces 1.00 mol of oxygen, with 1.00 mol of methane as a by-product. The methane is stored in a tank under pressure and is available to control the attitude of the spacecraft by controlled venting. A single astronaut exhales 1.13 kg of carbon dioxide each day. If the methane generated in the recycling of three astronauts' respiration during one week of flight is stored in an originally empty 120-L tank at -45.0°C, what is the final pressure in the tank? MPa Need Help? Read ItA closed system consisting of 2 lb of a gas undergoes a process during which the relation between pressure and volume is pV" = constant. The process begins with p₁ = 25 lbf/in², V₁ = 13 ft³ and ends with p2 = 100 lbf/in². The value of n = 1.3. Determine the final volume, V₂, in ft3, and determine the specific volume at states 1 and 2, in ft³/lb.
- (a) What is the gauge pressure in a 25.0oC car tire containing 3.60 mol of gas in a 30.0 L volume? (b) What will its gauge pressure be if you add 1.00 L of gas originally at atmospheric pressure and 25.0oC? Assume the temperature returns to 25.0oC and the volume remains constant.As shown in the figure, air with a volumetric flow rate of 16,000 ft3/min enters an air-handling unit at 80°F, 1 atm. The air-handling unit delivers air at 45°F, 1 atm to a duct system with three branches consisting of two 26-in.-diameter ducts and one 50-in. duct. The velocity in each 26-in. duct is 13 ft/s. Assume steady state operation and ideal gas behavior for the air. 7₂-73-7₁-45°F D₂-D₂-26 in. V₂ = V3 D₁-50 in. Duct system Air-handling unit 1- P₁ = P₂ = P₁ = P4 = 1 atm T₁ = 80°F (AV), Determine the mass flow rate of air entering the air-handling unit, in lb/s, the volumetric flow rate in each 26-in. duct, in ft³/min, and the velocity in the 50-in. duct, in ft/s.