25.A tank contains 80 ft³ of air at a pressure of 350 psi. If the air is cooled until itspressure and temperature decrease to 200 psi and 70•F respectively, what is thedecrease in internal energy?

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Answered: 25. A tank contains 80 ft3 of air at a…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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1. Oxygen at 30°C and 300 kPa absolute pressure expands isotherrnally to an absolute pressure of 120 kPa. Determine the final density of the gas. Ans. 1.52 kg/m³ 2. Air is enclosed by a rigid cylinder containing a piston. A pressure gage attached to the cylinder indicates an initial reading of 25 psi. Determine the reading on the gage when the piston has compressed the air to one-third its original volume. Assume the compression process to be isothermal and the local atmospheric pressure to be 14.7 psi. Ans. 104 psig 3. The viscosity of liquids can be measured through the use of a rotating cylinder viscometer of the type illustrated in Fig. P1.3. In this device the outer cylinder is fixed and the inner cylinder is rotated with an angular velocity w. The torque T, required to develop w is measured and the viscosity is calculated from these two measurements. Develop an equation relating u, w, T, e, Ro and Ri. Neglect end effects and assume the velocity distribution in the gap is linear.…
Subject Thermodynamics. Instructions: Don't round off in the process. Just round off in the final answer with 2 decimals only.
The Louisiana Superdome has an interior volume of 125 million ft3, covered by a 440,000 ft² roof. On a particular day, the interior air pressure gave a manometer reading of 19 inches mercury (pHg = 13.6 g/cm³). Local atmospheric pressure is 102 kPa. 1. kg Calculate the mass of the air inside, assuming an average temperature of 20 °C. 2. kN Calculate the net force applied to the roof by the interior/exterior air (do not account for the weight of the roof). Assume the roof is flat.
Air contained in a piston-cylinder system undergoes a polytropic process. Pv1.3 = constant P1 = 100 kPa pressure and T1 = 220C temperature to P2 = 500 kPa pressure is compressed. Calculate the specific volume and temperature at the end of the process.
1 Hour, 55 minutes, Use Given-Required-Solution in answering problems. Answers should be rounded off to four decimal places and enclosed in a box. A manometer is connected into a flow line. Figure below shows the reading. Assuming standard gravitational acceleration, and specific gravity of 13.6 for Hg, find the pressure at A and B if air is assumed to have density of 0.075 lb/ft3. See figure below. Open 42 in air 27 in B Upload Choose a file ENG
2. If 100 ft of atmospheric air at zero Fahrenheit temperature are compressed to a volume of 1 ftat a temperature of 200-F, what will be the pressure of the air in psi?
A 20,000 gallon reactor at atmospheric pressure and a temperature of 120 degrees F is heated to a temperature of 810 degrees F. What would the pressure in the reactor be
A. Four kg of water is placed in an enclosed volume of 800 L and heat is added until the temperature is 338 °F. Find (a) the pressure, (b) the mass of vapor, and (c) the volume of the vapor.
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2. If 100 ft³ of atmospheric air at zero Fahrenheit tempera- ture are compressed to a volume of 1 ft at a temperature of 200°F, what will be the pressure of the air in psi?

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25. A tank contains 80 ft3 of air at a pressure of 350 psi. If the air is cooled until its pressure and temperature decrease to 200 psi and 70°F respectively, what is the decrease in internal energy?