A 2-kW baseboard electric resistance heater in a vacant room is turned on and kept on for 15 min. The mass of the air in the room is 75 kg, and the room is tightly sealed so that no air can leak in or out. The temperature rise of air at the end of 15 min is

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Q: A bladder accumulator has an expanded gas volume of 4 liter and is precharged with nitrogen (u-1.4)…

A: Write the given data with suitable variables: V1=4 l=0.004 m31000 l1 m3V2=0.002 m3P1=3 MPa

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Q: The temperature of a 500 gram closed system was 10 C. By an electric heater, Energy of 2000 calories…

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Q: It is a hot day in Atlanta and you and your friends bought an ice cream maker. The unit consists of…

A: To obtain the solution of the above question, we will apply the 1st law of thermodynamics and is…

Q: 2.8 kg of air is inside a closed, rigid tank as shown. Initially the air is at a pressure of 2.2 bar…

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Q: The properties at the inlet and the exit states of the air compressor are shown in the figure. The…

A: P

Q: Air is flowing steadily through a horizontal heated tube. The air enters at 40°F and at a velocity…

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Q: An insulated rigid tank is divided into two equal parts by a partition. Initially, one part contains…

A: It is a free expansion , as gas is expanding against zero resistance therefore work done is zero .…

Q: During a process, the temperature of the system rises from 100°C to 200°C. Hent transfer per degree…

A: Given that,  T1=100°C=100+273=373 KT2=200°C=200+273=473 KδQδT=1.005 kJ/K…

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Q: In a reciprocating air compressor, high pressure air in the cylinder pushes the piston against the…

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Q: The enthalpy of air is increased by 139.586 KJ/kg in a compressor. The rate of air flow is 16.42…

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Q: Determine the quantity (volume) of saline water in a steam generator. The heat energy of 1525 kJ is…

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Q: During a non-flow thermodynamic process(1-2) executed by a perfect gas, the heat interaction is…

A: Given that: For a flow process, Q1-2 = W1-2 It is required to determine the process.

Q: Derive an equation for work done by the  system  during isothermal expansion process.

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Q: Seventy kilojoules of work is done by each kilogram of fluid passing through an apparatus under…

A: GIVEN DATA -

Q: Determine the quantity (volume) of saline water in a steam generator. The heat energy of 1605 kJ is…

A:

Q: A mass of 7 kg undergoes a process during which velocity decreases from 32 m/s to 19m/s, while the…

A: Givenm=7kgv1=32m/sv2=19m/su1=1.24kJ/kgu2=2.08kJ/kgQ1=2kJQ2=-0.8kJ

Q: A body at temperature 39ºC is kept in a surrounding of constant temperature 20ºC. It is observed…

A: GivenTbody=39°CTsurr=20°C

Q: A gas tank is accidentally placed near a heat source. Its bourdon pressure gauge reading was…

A: Considering gas tank to be rigid and given gas as ideal gas, we solved it using ideal gas equation…

Q: Determine the quantity (volume) of saline water in a steam generator. The heat energy of 1527 kJ is…

A: Given:Q=1527 KJ/kgT1=27 CT2=101 Cρ=1014 kg/m3c=3.3 KJ/kg.K

Q: A 2-kW electric resistance heater in a room is turned on and kept on for 30 min. The amount of…

A: Power of electric resistance heater, P= 2-kW or 2000 W  Time of working, t= 30 min or (30*60)…

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Q: A 5-hp pump compressor delivers oxygen at a rate of 30 cubic feet per minute. The pressure and…

A: Given data: Power consumed by compressor = 5 hp = 3.73 KW                     Discharge rate = 30…

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A: Given that, Volume below stopper, v1=0.15 m3Mass of the water, m=2 kg,Temperature of water, T=40…

Q: Superheated steam at 1.0MPa and 300C inside a cylinder of volume 3.0 liters drives a piston in…

A: The ideal gas equation can be used for superheated steam. Here, the superheated steam expands…

Q: 169 g of solid water (i.e. ice), at -17 °C, is placed into a sealed, insulated container with a…

A: The step by step solution is mentioned below

Q: What is a K system?

A: given: What is a K system?

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Q: s to warm up from 10 C to 20 C in a room whose temperature is 30 C. Assuming Newton's law of…

A: Given:t1=15 min =15*60t1=900 secTb=10°CT1=20°CT∞=30°CT2=25°C

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Q: Newton's Law of Cooling says that the rate at which a body cools is proportional to the differnce C…

A: Part A) By apply the initial boundary condition determine the constant value.

Q: À Piston-cylinder deice contains I Kg of water at 20°c and 300 kPa . There is a linear Spring…

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Q: How would you define a system to determine the temperature rise created in a lake when a portion of…

A: There are three types of system in Thermodynamics based on Mass and Energy interaction between…

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.