A 15-cm-diameter aluminum ball is to be heated from 80°C to an average temperature of 220C. Taking the average density and specific heat of aluminum in this temperature range to be ρ=2700 kg/m3 and Cp=0.90 kJ/kg·°C, respectively, determine the amount of energy that needs to be transferred to the aluminum ball.

Q: A 14-ft tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is…

A: Given data as per the question The volume of tank= 14 ft3 =0.396436 m3 Initial pressure =14.7 psia…

Q: A heating device contains 5 kg water and is being heated. During the process, 11 kJ/kg of heat is…

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Q: A rigid tank initially contains saturated vapor at 0.45 MPa. Then heat transferred to water until…

A: Given        Initial Pressure, P1 = 0.45 MPa  Final Temperature, T1 = 350oC

Q: An insulated piston-cylinder device initially contains 2.3 kg of Argon at 100 kPa and 300 K. Now an…

A: Given Data- m=2.3kg of Argon P=100kPa =100×103 Pa T=300K t=6 min=6× 60 sec V2=2.5×V1 To find- Power…

Q: A 10-kg mass of superheated refrigerant(R-22) at 1.2 MPa and 70°C is cooled at constant pressure…

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Q: Determine the total work produced during this process, in kJ.

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Q: The water vapor is manually compressed in an unknown process until the volume of water vapor (Vw2)…

A: Given that, Mass of air, ma=0.4 kg,Pressure of air, Pa1=250 kPa,Temperature of air, Ta1=300 K,Mass…

Q: A rigid tank is divided into two equal parts by a partition. Initially, one side of the tank…

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Q: A rigid tank contains 20 Ibm of air at 50 psi and 80°F. The air is now heated until its pressure is…

A: The solution is given below

Q: A 14-ft3 tank contains oxygen initially at 14.7 psia and 80°F. A paddle wheel within the tank is…

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Q: The heat transfer of gas during the process, in kJ. (2) The velocity of the piston at the final…

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Q: Saturated liquid water with a volume of 1.2 m3 and temperature of 200°C is allowed to isothermally…

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Q: Two different piston – cylinder devices each contain 1 kg of air. Initially, the temperature T = 300…

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Q: Consider an electrically heated room with a floor space of 100 m² and an average height of 4 m at…

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Q: Determine the heat interaction when a gas does 12 kJ of work which cause the internal energy to…

A: GivenW=12 kJE=30 kJAskedq=?SolutionE=q+W

Q: The roof of an electrically heated home is 9 m long, 12 m wide, and 0.50 m thick, and is made of a…

A: GIVEN DATA - AREA OF ROOF A=9*12m2 THICKNESS dx=0.50m Thermal conductivity k=0.8W/m'C T1=25'C T2=5'C…

Q: 2-kg of air (ideal gas) undergoes a compression process from 120 kPa to 600 kPa at a constant…

A: Given Data: Mass of the air, m=2 kg Temperature, T=300 K

Q: A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in  a bunker for…

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Q: 20 kg of steam contained in a high-pressure tank. Tank is isolated, but heat loss to the surrounding…

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Q: A rigid tank initially contains saturated vapor at 0.6 MPa. Then heat transferred to water until its…

A: Given data, Initially the vapor is saturated vapor at 0.6 MPa pressure. Finally the temperature of…

Q: The average thermal conductivity of the walls (including windows) and roof of a house in the figure…

A: Given data: K = 4.8 ×10-4 kW/m.°C = 0.48 W/m.°C Average thickness, t = 22.8 cm = 0.228 m  Heat of…

Q: KPa and Is a erature is 696.54 C. Determine the change of internal energy in kJ.

A: GivenVolume=10m3Pressure P1=569.16kpaInitial Temperature T1=429.91KFinal…

Q: (a) The initial temperature of the refrigerant (oC), (b) The final volume of the refrigerant ( in…

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Q: A 15-cm diameter copper ball is to be heated from 100°C to an average temperature of 150°C in 20…

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Q: The average thermal conductivity of the walls (including windows) and roof of a house in the figure…

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Q: As the insulation around an adiabatic and frictionless piston-cylinder system is removed, 42500 J…

A: Given: The heat removed from the system Q=-42500 J. The initial volume is V1=400 dm3. The…

Q: In a piston cylinder device, 15 kg of air is heated from 25°C to 77°C by passing current through a…

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Q: A 36-m room is to be heated by three ton(1 ton =1000 kg) of liquid water contained in a tank that is…

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Q: A 50-L electrical radiator containing heating oil is placed in a 50-m3 room. Both the room and the…

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Q: A piston cylinder device contains 0.5 kg of water at 2 MPa and 450°C. The steam loses heat to the…

A: Given: Initial pressure→P1=2 MPa initial temperature→T=450°C At this state from the steam…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.