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A workshop with well-insulated walls and containing 700 m3 of air at 275 K is heated...
A large garage with well-insulated walls and containing 700 m3 of air at 305 K is...
A large garage with well-insulated walls and containing 700 m3 of air at 305 K is heated at constant pressure (atmospheric). Consider air to be an ideal diatomic gas. (a) Determine the energy (in kJ) required to increase the temperature of the air in the building by 1.70°C. kJ (b) Determine the mass (in kg) this amount of energy could lift through a height 1.50 m. kg
A rigid tank whose volume is 3 m3, initially containing air at 1 bar, 295 K,...
A rigid tank whose volume is 3 m3, initially containing air at 1 bar, 295 K, is connected by a valve to a large vessel holding air at 6 bar, 295 K. The valve is opened only as long as required to fill the tank with air to a pressure of 6 bar and a temperature of 320 K. Assuming the ideal gas model for the air determine the heat transfer between the tank contents and the surroundings, in kl....
4. The air in a 100 m3 balloon is electrically heated from 10 C to 35...
4. The air in a 100 m3 balloon is electrically heated from 10 C to 35 C in 12 minutes. Assuming that the balloon is well insulated, and atmospheric pressure is 100 kPa, how much electrical power will the resistance heater need to dissipate to heat up the balloon?
Air enters a well-insulated nozzle at 400 m/s, 7 kPa, and 417°C and exits at 700...
Air enters a well-insulated nozzle at 400 m/s, 7 kPa, and 417°C and exits at 700 m/s. The nozzle inlet diameter is 0.2 m. Assuming ideal gas behavior, calculate a) the mass flow rate of the air. Then, determine the exit temperature of the air two ways: b) using the air table (A-17, which automatically accounts for the variation of specific heat with temperature); and c) assuming constant specific heats at the inlet temperature of 417°C. i he comatn speche...
Heat Loss and Heating Costs of a House Part A A house has well-insulated walls 17.1...
Heat Loss and Heating Costs of a House Part A A house has well-insulated walls 17.1 cm thick (assume conductivity of air) and area 411 m2, a roof of wood б.бб cm thick and area 279 m2, and uncovered windows 0.626 cm thick and total area 33.4 m2. Assuming that the heat loss is only by conduction, calculate the rate at which heat must be supplied to this house to maintain its temperature at 21.4°C if the outside temperature is...
A frictionless piston-cylinder device contains air at 300 K and 1 bar and is heated until...
A frictionless piston-cylinder device contains air at 300 K and 1 bar and is heated until its volume doubles and the temperature reaches 600 K. Answer the following: A. You are interested in studying the air in the piston-cylinder device as a closed system. Draw a schematic of your device and the boundary that defines your system. Assume the cylinder is in horizontal position. B. Determine the final pressure of the air at the end of the process, in bar....
Answers are next to the problems. 2. A small, un-insulated closed cylinder with a freely moving...
Answers are next to the problems.
2. A small, un-insulated closed cylinder with a freely moving piston contains air and is accidentally dropped into a lake and falls slowly to the bottom at 100 m below the surface Initially, the air in the cylinder is at atmospheric pressure of 100 kPa with a volume of 0.1 m3 and a temperature of 20°C. The lake is also at a uniform and constant temperature of 20°C. As the cylinder falls, the air...
Question 20 A rigid, well Insulated tank of volume 0.9 m3 is initially evacuated. At timet,...
Question 20 A rigid, well Insulated tank of volume 0.9 m3 is initially evacuated. At timet, air from the surroundings at a pressure of 1 bar and temperature of 27 begins to flow into the tank, An electric resistor transfers energy to the air in the tank at a rate of 676 Watts. Determine the time required for the temperature of air inside the tank to reach 457 C at the same Initial pressure of 1 bar. Note: Please upload...
An 7.0 cm -diameter, well-insulated vertical cylinder containing nitrogen gas is sealed at the top by...
An 7.0 cm -diameter, well-insulated vertical cylinder containing nitrogen gas is sealed at the top by a 5.0 kg frictionless piston. The air pressure above the piston is 100 kPa. A) What is the gas pressure inside the cylinder? Express your answer to two significant figures and include the appropriate units. B) Initially, the piston height above the bottom of the cylinder is 25 cm . What will be the piston height if an additional 3.2 kg are placed on...
Problem 6.028 SI Air contained in a rigid, insulated tank fitted with a paddle wheel, initially...
Problem 6.028 SI Air contained in a rigid, insulated tank fitted with a paddle wheel, initially at 300 K, 2 bar, and a volume of 2 m, is stirred until its temperature is 600 K. Assuming the ideal gas model for the air, and ignoring kinetic and potential energy, determine (a) the final pressure, in bar (b) the work, in kJ (c) the amount of entropy produced, kJ/K Solve using: (1) data from Table A-22. (2) constant cy read from...
A rigid tank whose volume is 3 m3, initially containing air at 1 bar, 295 K, is connected by a valve to a large vessel holding air at 6 bar, 295 K. The valve is opened only as long as required to fill the tank with air to a pressure of 6 bar and a temperature of 320 K. Assuming the ideal gas model for the air determine the heat transfer between the tank contents and the surroundings, in kl....
4. The air in a 100 m3 balloon is electrically heated from 10 C to 35 C in 12 minutes. Assuming that the balloon is well insulated, and atmospheric pressure is 100 kPa, how much electrical power will the resistance heater need to dissipate to heat up the balloon?
Air enters a well-insulated nozzle at 400 m/s, 7 kPa, and 417°C and exits at 700 m/s. The nozzle inlet diameter is 0.2 m. Assuming ideal gas behavior, calculate a) the mass flow rate of the air. Then, determine the exit temperature of the air two ways: b) using the air table (A-17, which automatically accounts for the variation of specific heat with temperature); and c) assuming constant specific heats at the inlet temperature of 417°C. i he comatn speche...
Heat Loss and Heating Costs of a House Part A A house has well-insulated walls 17.1 cm thick (assume conductivity of air) and area 411 m2, a roof of wood б.бб cm thick and area 279 m2, and uncovered windows 0.626 cm thick and total area 33.4 m2. Assuming that the heat loss is only by conduction, calculate the rate at which heat must be supplied to this house to maintain its temperature at 21.4°C if the outside temperature is...
Answers are next to the problems.
2. A small, un-insulated closed cylinder with a freely moving piston contains air and is accidentally dropped into a lake and falls slowly to the bottom at 100 m below the surface Initially, the air in the cylinder is at atmospheric pressure of 100 kPa with a volume of 0.1 m3 and a temperature of 20°C. The lake is also at a uniform and constant temperature of 20°C. As the cylinder falls, the air...
Question 20 A rigid, well Insulated tank of volume 0.9 m3 is initially evacuated. At timet, air from the surroundings at a pressure of 1 bar and temperature of 27 begins to flow into the tank, An electric resistor transfers energy to the air in the tank at a rate of 676 Watts. Determine the time required for the temperature of air inside the tank to reach 457 C at the same Initial pressure of 1 bar. Note: Please upload...
Problem 6.028 SI Air contained in a rigid, insulated tank fitted with a paddle wheel, initially at 300 K, 2 bar, and a volume of 2 m, is stirred until its temperature is 600 K. Assuming the ideal gas model for the air, and ignoring kinetic and potential energy, determine (a) the final pressure, in bar (b) the work, in kJ (c) the amount of entropy produced, kJ/K Solve using: (1) data from Table A-22. (2) constant cy read from...
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