Q-1 Air at 1 atm and 20 0C occupies an initial volume of 1000 cm3 in...
Q-1 Air at 1 atm and 20 0C occupies an initial volume of 1000 cm3 in a cylinder. The air is confined by a piston which has a constant restraining force so that the gas pressure always remains constant. Heat is added to the air until its temperature reaches 260 0C. Calculate (a) the heat added (b) the work done by the gas, (c) the change in internal energy of the gas.
Q-2 An ideal gas is contained in a closed assembly with an initial pressure of 220 kPA and 70oC respectively. If the volume of the system is increased 1.5 times and the temperature drops to 15o C, determine the final pressure of the gas.
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Q-1 Air at 1 atm and 20 0C occupies an initial volume of 1000
cm3 in...
1. Air in a cylinder with a volume of 500 cm3 is compressed by a piston...
1. Air in a cylinder with a volume of 500 cm3 is compressed by a piston to a volume of 150 cm3. If the initial air pressure is 5 x 104 Pa (N/m2), what is the pressure in the cylinder after compression? (Assume that this is a slow process, and that T remains constant.) 8. The sample of gas in Question 2 is contained in a rigid closed container. If the pressure of the gas is 1013 mb at 20°C, what...
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in...
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in a frictionless adiabatic piston-cylinder. Find the volume of the cylinder (m). Find the initial internal energy (kj/kg) using the air tables. A. B. The air is compressed po ytropically according to P * (V)1.4 = constant to a volume which is 32.3% of the initial volume (V.-0323 V). Find the new volume (m), pressure (kPa), temperature (K) and internal energy (kJ/kg). Find the work...
In an experiment to simulate conditions within an automobile engine, 0.175 mol of air at a temper...
In an experiment to simulate conditions within an automobile engine, 0.175 mol of air at a temperature of 710 K and a pressure of 3.10x106 Pa is contained in a cylinder of volume 330 cm3. Then 665 J of heat is transferred to the cylinder. If the volume of the cylinder is constant while the heat is added, what is the final temperature of the air? Assume that the air is essentially nitrogen gas If instead the volume of the...
Air in a cylinder with a volume of 500 cm3 is compressed by a piston to...
Air in a cylinder with a volume of 500 cm3 is compressed by a piston to a volume of 150 cm3. If the initial air pressure is 5 x 104 Pa (N/m2), what is the pressure in the cylinder after compression? (Assume that this is a slow process , and that T remains constant.) Pa?
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100...
A piston cylinder device contains air with a volume of 0.05 m3 at 25oC and 100 kPa pressure. The gas is now compressed to a final temperature of 95oC at 250 kPa. This compression is polytropic and follows PVn=constant. a. Determine how much boundary work was added to the gas [in kJ] b. How much heat was added or removed from this system during this process? [in kJ]
In an experiment to simulate conditions within an automobile engine, 0.175 mol of air at a...
In an experiment to simulate conditions within an automobile engine, 0.175 mol of air at a temperature of 800 K and a pressure of 3.00×106 Pa is contained in a cylinder of volume 390 cm3 . Then 640 J of heat is transferred to the cylinder. A) If the volume of the cylinder is constant while the heat is added, what is the final temperature of the air? Assume that the air is essentially nitrogen gas. B) If instead the...
A four cylinder gasoline engine with a clearance volume of 225 cm3 and cylinder volumes of...
A four cylinder gasoline engine with a clearance volume of 225 cm3 and cylinder volumes of 1900 cm3 is operating at 5000 rpm. Air enters at 28°C temperature and 97 kPa pressure, and pressure before and after combustion are 1500 and 6500 kPa Determine: (a) Power produced (b) Heat added during combustion (c) Heat rejected (d) Thermal efficiency 5.
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume...
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume relation is p. V..2=constant. The initial volume is 0.5 m², the initial temperature is 500 K and initial pressure is 600 kPa. The final pressure is 300 kPa. Determine (a) the mass of air, in kg (b) the boundary work, in kJ (c) the final temperature in K and (d) the heat transfer, in kJ.
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compres...
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compression process (during which PV1.30-constant) to a final state where the temperature is 200 °C. The specific heats are assumed to be constant while Tsur - 15 C a) Prove that the gas, at state 1, can be treated as an ideal gas. b) Find the pressure and volume at state 2 c) Find the heat transfer, in kJ. d) Find the...
(a) An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure. Determine...
(a) An ideal gas occupies a volume of 1.8 cm3 at 20°C and atmospheric pressure. Determine the number of molecules of gas in the container. _____________ molecules (b) If the pressure of the 1.8-cm3 volume is reduced to 2.4 ✕ 10−11 Pa (an extremely good vacuum) while the temperature remains constant, how many moles of gas remain in the container? ____________ mol
USE THE AIR TABLES 0.5 kg of air is initially at 280 K, 100 kPa in a frictionless adiabatic piston-cylinder. Find the volume of the cylinder (m). Find the initial internal energy (kj/kg) using the air tables. A. B. The air is compressed po ytropically according to P * (V)1.4 = constant to a volume which is 32.3% of the initial volume (V.-0323 V). Find the new volume (m), pressure (kPa), temperature (K) and internal energy (kJ/kg). Find the work...
In an experiment to simulate conditions within an automobile engine, 0.175 mol of air at a temperature of 710 K and a pressure of 3.10x106 Pa is contained in a cylinder of volume 330 cm3. Then 665 J of heat is transferred to the cylinder. If the volume of the cylinder is constant while the heat is added, what is the final temperature of the air? Assume that the air is essentially nitrogen gas If instead the volume of the...
A four cylinder gasoline engine with a clearance volume of 225 cm3 and cylinder volumes of 1900 cm3 is operating at 5000 rpm. Air enters at 28°C temperature and 97 kPa pressure, and pressure before and after combustion are 1500 and 6500 kPa Determine: (a) Power produced (b) Heat added during combustion (c) Heat rejected (d) Thermal efficiency 5.
Air in a piston-cylinder assembly undergoes a polytropic expansion in which the pressure – specific volume relation is p. V..2=constant. The initial volume is 0.5 m², the initial temperature is 500 K and initial pressure is 600 kPa. The final pressure is 300 kPa. Determine (a) the mass of air, in kg (b) the boundary work, in kJ (c) the final temperature in K and (d) the heat transfer, in kJ.
Nitrogen in a piston cylinder device occupies 0.5 m3 at 100 kPa and 20 °C. It undergoes a compression process (during which PV1.30-constant) to a final state where the temperature is 200 °C. The specific heats are assumed to be constant while Tsur - 15 C a) Prove that the gas, at state 1, can be treated as an ideal gas. b) Find the pressure and volume at state 2 c) Find the heat transfer, in kJ. d) Find the...
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