Homework Answers
3. Estimate the difference between the weight of air in a room that measures 20 x...
3. Estimate the difference between the weight of air in a room that measures 20 x 100 x 10 ft in the summer when T = 90 °F and the winter when T = 10 °F. Use Pressure in room = 14 psia. Use the ideal gas assumption for air ( Molecular Weight of Air = 28.97kg/kmol
5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft'. At this...
5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft'. At this state, a linear spring (F « x) with a spring constant of 15,000 lbf/ft is touching the piston but exerts no force on it. The cross-sectional area of the piston is 3 f?. Heat is transferred to the hydrogen, causing it to expand until its vol- ume doubles. Determine (a) the final pressure, (b) the total work done by the hydrogen, and (c) the...
The air in a room 10 ft by 8 ft by 8 ft is 4% carbon...
The air in a room 10 ft by 8 ft by 8 ft is 4% carbon monoxide. Starting at t= 0, fresh air containing no carbon monoxide is blown into the room at a rate of 75 ft/min. If air in the room flows out through a vent at the same rate, when will the air in the room be 0.01% carbon monoxide? minutes. The air in the room will be 0.01% carbon monoxide after (Round to two decimal places...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is its final pressure? (Standard conditions of air is 68 °F or 293.15 K and 14.7 psia or 101 kPa abs)
One imperial cup of water is in a 10ft X 20ft X 20ft sealed room filled...
One imperial cup of water is in a 10ft X 20ft X 20ft sealed room filled with air. The initial temperature of the water is 130 F. The initial temperature of the room air is 70F and the pressure is 14.7 psia. Heat is transferred from the air in the room to the water in the cup until the temperature of the room air is 69F. Show that this is not possible using the first and second laws of thermodynamics. Assume the specific heat of...
You got this question right in the previous attempt. Check my work View previous attempt Required...
You got this question right in the previous attempt. Check my work View previous attempt Required information Part 1 of 2 An air-standard cycle with constant specific heats at room temperature is executed in a closed system and is composed of the following four processes: 1-2 v=Constant heat addition from 14.7 psia and 80°F in the amount of 300 Btu/ibm 2-3 P=Constant heat addition to 3100 R 3-4 Isentropic expansion to 14.7 psia 4-1 P=Constant heat rejection to initial state...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to ...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100%. If the relative humidity of the air is 56% and its temperature is 70°F, how many grams of water are present in a room measuring 15 ft x 10 ft x 11 ft? The vapor pressure of water at 68 °F is 17.54 torr. Show your work
15. The...
Air is flowing through a duct that is 48" by 60". The air has a mass...
Air is flowing through a duct that is 48" by 60". The air has a mass flow rate of 415,000 lbm/hour. If the air can be modeled as an Ideal Gas, and is at 70oF and 20 psia, what is its average velocity in the duct? Answer: between 55 and 60 f/s
The relative humidity of air equals the ratio of the partial pressure of water in the...
The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100%. If the relative humidity of the air is 58% and its temperature is 68 oF , how many moles of water are present in a room measuring 12 ft x 10 ft x 8 ft? The vapor pressure of water at 68 oF is 17.54 torr.
Part A What is the approximate mass of air in a living room 5.3 m x...
Part A What is the approximate mass of air in a living room 5.3 m x 4.0 m x 2.9 m? The density of ar s1,29 kg/m Express your answer to two significant figures and include the appropriate units. m- Value Units
3. Estimate the difference between the weight of air in a room that measures 20 x 100 x 10 ft in the summer when T = 90 °F and the winter when T = 10 °F. Use Pressure in room = 14 psia. Use the ideal gas assumption for air ( Molecular Weight of Air = 28.97kg/kmol
5-18E Hydrogen is contained in a piston-cylinder device at 14.7 psia and 15 ft'. At this state, a linear spring (F « x) with a spring constant of 15,000 lbf/ft is touching the piston but exerts no force on it. The cross-sectional area of the piston is 3 f?. Heat is transferred to the hydrogen, causing it to expand until its vol- ume doubles. Determine (a) the final pressure, (b) the total work done by the hydrogen, and (c) the...
The air in a room 10 ft by 8 ft by 8 ft is 4% carbon monoxide. Starting at t= 0, fresh air containing no carbon monoxide is blown into the room at a rate of 75 ft/min. If air in the room flows out through a vent at the same rate, when will the air in the room be 0.01% carbon monoxide? minutes. The air in the room will be 0.01% carbon monoxide after (Round to two decimal places...
5) Air at standard conditions is compressed from 7 m to 1 m isothermally. What is its final pressure? (Standard conditions of air is 68 °F or 293.15 K and 14.7 psia or 101 kPa abs)
You got this question right in the previous attempt. Check my work View previous attempt Required information Part 1 of 2 An air-standard cycle with constant specific heats at room temperature is executed in a closed system and is composed of the following four processes: 1-2 v=Constant heat addition from 14.7 psia and 80°F in the amount of 300 Btu/ibm 2-3 P=Constant heat addition to 3100 R 3-4 Isentropic expansion to 14.7 psia 4-1 P=Constant heat rejection to initial state...
15. The relative humidity of air equals the ratio of the partial pressure of water in the air to the equilibrium vapor pressure of water at the same temperature times 100%. If the relative humidity of the air is 56% and its temperature is 70°F, how many grams of water are present in a room measuring 15 ft x 10 ft x 11 ft? The vapor pressure of water at 68 °F is 17.54 torr. Show your work
15. The...
Part A What is the approximate mass of air in a living room 5.3 m x 4.0 m x 2.9 m? The density of ar s1,29 kg/m Express your answer to two significant figures and include the appropriate units. m- Value Units
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