Pressure cookers, in general, maintain a gage pressure of 2 atm (or 3 atm absolute) inside. Therefore, pressure cookers cook at a temperature of about 133°C instead of 100°C, cutting the cooking time by as much as 70 percent while minimizing the loss of nutrients. The newer pressure cookers use a spring valve with several pressure settings rather than a weight on the cover. A certain pressure cooker has a volume of 6 L and an operating pressure of 75 kPa gage. Initially, it contains 1 kg of water. Heat is supplied to the pressure cooker at a rate of 500 W for 30 min after the operating pressure is reached. Assuming an atmospheric pressure of 100 kPa, determine the amount of water left in the pressure cooker at the end of the process.

Q: The two tanks (Tank A and Tank B) are connected by a valved tube. Initially, the valve is closed.…

A: At tank A pressure PA = 1 MPa temperature TA = 350°C = 350+273 = 623 K mass of vapour mv = 1.5 kg At…

Q: Air is contained in a vertical piston-cylinder assembly fitted with an electrical resistor. The…

A: Given:-         Assume air as a system then the energy balance is:

Q: Q2/ A 1-m² tank containing air at 25°C and 500 kPa is connected through a valve to another tank…

A: Given: Volume of tank 1 V1=1m3Temperature of air in tank 1 T1=25°C or 298KPressure if the air in…

Q: A monatomic ideal gas initially fills a V0 = 0.45 m3 container at P0 = 85 kPa. The gas undergoes an…

A: Given, Initial volume, V1=0.45 m3 Final volume, V2=1.4 m3 Initial pressure, P1=85 kPa=85000 Pa

Q: Air compressed in a diesel engine from an initial pressure of 13 psia and a temperature of 120F to…

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Q: Determine the temperature, quality, and internal energy of 5 kg of water in a rigid container of…

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Q: A 0.75-m3 rigid tank initially contains air whose density is 1.18 kg/m^3. The tank is connected to a…

A: Given:- V=0.75m3 ρ1=1.18 kg/m3 ρ2=4.95 kg/m3 To find:- Mass of air entered in tank(mair)=?

Q: What is the specific internal energy of water at 50 kPa and 200°C?

A: Converting Pressure into Mpa, 50 kPa = 0.05MPa

Q: A rigid vessel of volume 0.02 m3 contains 0.054 kg of steam at an initial pressure of 4 bar. Heat is…

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Q: A gas is contained in a vertical, frictionless piston– cylinder device. The piston has a mass of…

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Q: For a process with an ideal gas assuming constant specific heats, which set of values should be used…

A: Internal energy is the energy of a substance that changes with the change in the temperature of the…

Q: A monatomic ideal gas initially fills a V0 = 0.35 m3 container at P0 = 75 kPa. The gas undergoes an…

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Q: The device that stores the potential energy of an incompressible fluid is O a. pressure absorbing…

A: Question)  The device that stores the potential energy of an incompressible fluid is .............

Q: A mixture of liquid and gaseous water is a pure substance, but a mixture of liquid and gaseous air…

A: As there are some chemicals present in the gaseous air which are not soluble in the liquid.

Q: What happens when a saturated vapor is heated at constant pressure? What happens when it is…

A: Water is considered to be in the state of saturated vapor when it contains all the composition of…

Q: ir is compressed into a 90 ft3 rigid tank until the pressure is 30.5 psia and the temperature…

A: Given          Volume, V = 90 ft3        Pressure, P = 30.5 psia Temperature, T = 580 R Find   Mass…

Q: Define pressure in a liquid at rest increases linearly with distance from the free surface.

A: Consider a small body submerged in water. Consider the cross-section area of body is dA. Assume a…

Q: 1m of saturated liquid water at 200°C is expanded until its quality is 80 percent and the pressure…

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Q: Air at 10.0°C and normal atmospheric pressure is used to inflate the tires in an automobile. When…

A: Given, When the air fills inside the tire P1 = Initial pressure of the air inside the tire = 1 atm =…

Q: A 0.65m3 vessel contains a mixture of air and carbon dioxide with a pressure of 232kPa and a…

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Q: In Otto Cycle, air at 18oC is first compressed to one- eight of its original volume.  If the heat…

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Q: The pump of a water distribution system is powered by a 15-kW electric motor whose efficiency is 90…

A: Given: The efficiency of the electric motor is ƞmotor=90%. The water flow rate is V=50 L/s. The…

Q: Air is enclosed by a rigid cylinder containing a piston. A pressure gage attached to the cylinder…

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Q: Directions: Identify the condition of the following steam and write whether if it is at saturation…

A: (1)Tgiven=2000cfrom steam table Psat=1289 kpa(12.89 Mpa) Psat>Pgiven Considering steam table at…

Q: What is a quasi-equilibrium process? What is its importance in engineering?

A: Quasi-equilibrium process The quasi-equilibrium process is considered as the almost slow or…

Q: A closed tank A contains 3 ft3 of air at 500 psia and a temperature of 1200F.  This tnk connects…

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Q: The instruction booklet for your pressure cooker indicates that its highest setting is 11.3 psipsi .…

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Q: A mass of 300kg of oil is cooled in 1 hour from 70 celcius to 35 celcius in a cooler consisting of a…

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Q: 4. Air is compressed polytropically so that the quantity PV14 is constant. If 0.02 m³ of air at…

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Q: How much work (in ft-lbf) is done when 10 ft3 of an air is initially at a pressure of 1 atm and a…

A: Given data,  V1= 10 ft3  P1= 1 atm  T=0°C  P2=6 atm

Q: Define the control volume can involve fixed, moving, real, and imaginary boundaries.

A: Real Boundary: In a real boundary, no mass transfer is possible. Example: Cylinder pistons, walls of…

Q: Determine the mass of air at a pressure of 215kPa and a temperature of 31°C in a 132-gallon…

A: Given: P = 215 kPa T = 31°C  V = 132-gallons

Q: A refrigerant underwent isometric expansion from 5 megapascals to 1 atmosphere. Determine the drop…

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Q: Air is contained in a vertical piston–cylinder assembly fitted with an electrical resistor. The…

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Q: A motorist equips his automobile tires with a relief-type valve so that the pressure inside the tire…

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Q: 1000 cm³ of air at an initial pressure of 1.10 × 10° Pa and temperature of 300 K undergoes the…

A: Thermodynamic Processes There are various thermodynamic processes Isobaric Process  : In this…

Q: A Carnot engine absorbs 200J of heat from a reservoir at the temperature of the normal boiling point…

A: Heat absorbed = 200 J

Q: QI/ A container contains 4 kg of air at a pressure of 600 kPa and a temperature of 40 °C. The…

A: Given data: m=4 kgP1=600 kPaT1=40°CP2=250 kPaT2=15°C Need to determine the volume of each container.

Q: hot air is compressed polytropically so that the quantity pvn is constant. if 0.02m3 of air at…

A: Given Data  Atmospheric pressure, P1=101.3 KPA Gauge pressure, P2=405+101.3=506.3 Kpa Initial…

Q: The pressure gage on a 2.5-m3 oxygen tank reads 500 kPa. Determine the amount of oxygen in the tank…

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Q: While the pressure remains constant at 689.5 kPa the volume of a system of air changes from 0.567 m3…

A: Given Data⇒ Pressure is constant. P=689.5 KPa Initial and final volume : V1=0.567 m3V2=0.283 m3

Q: How much work is done when 10 ft of an air is initially at a pressure of 1 atm and a temperature of…

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Q: Determine the heat transfer (in kJ) necessary to increase the pressure of 70 percent quality steam…

A: Given   Pressure, P1 = 200 kPa                 P2 = 800 kPa    Volume, V = 2 m3 Find   Heat…

Q: Determine the mass of air in lbm when the pressure is 17.97 psi and the temperature is 94.9°F in a…

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Q: In a reservoir, the pressure of a compressed gas must not be increased past 825 kPa.  The gauge…

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Q: The boundary work associated with the compression of 1-kg of air (as an ideal gas) from 400 kPa to…

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Thermodynamic Relations

Thermodynamics is the division of physics that deals with the transfer of any kind of energy, whether it be heat, temperature, or work, from one object to another.