A pot contains water and is heated on a cooker. The cooker adds 23.3 kJ to the pot with 0.8 kJ lost to the environment. Find the stirring work needed to be added to it in kJ and 2 sf to achieve a total energy change of 25.6 kJ.

Q: There is air at a temperature of 300 K and a pressure of 150 kPa in a closed container of constant…

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Q: Use the adiabatic pressure vs. volume relation to find a change in pressure and the work done on a…

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Q: Consider a conventional piston-cylinder system. Compute the work required to compress air to 0.2 m3…

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Q: 3 kg air with initial temperature of 200°C expands at a constant pressure of 4 bar to reach to a…

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Q: A rigid container with volume of 200 L is divided by a partition resulting to two equal volumes A…

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Q: Calculate the boundary work for the cycle in kJ. Calculate the amount of heat transferred in each…

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Q: A hot water boiler heats 2,800 lb/hr of water from 50oF  to 220oF, at 40 psia.  How much heat is…

A: Given data⇒Mass flow ratem=2800lbhrT1=50°FT2=220°FP=40 PsiaProblem definition⇒How much heat is added…

Q: How much work was required (kJ)?

A: take properties from steam table here state 1 is super heated state and 2 is sub cooled state.so…

Q: 50 btu of heat are added to a gas at a constant temperature of 600 F. How much of this heat is…

A: Given Data: The heat added at temperature TH  = 600 F is Q = 50 Btu. The refrigerator temperature…

Q: A closed system consists of gas of 2 kg initially in state 1 with p1 = 4bar and specific volume 1m³…

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Q: Water enters a pump as saturated liquid 50 kPa at a rate of 3.0 kg/s and exits with a pressure of 10…

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Q: 3kg of Co2 expanded in a stationary piston cylinder through a polytropic process from 30 degree…

A: T1= 30+273= 303K, m=3kgP1=250KPa, P2=100KPan=1.45T2T1= 1002501.45-11.45=228.014KTotal Work, W=…

Q: A compressor has R-134a entering at 10°C, 100 kPa and exiting as a saturated vapor. It is given that…

A: Given Data The internal temperature of the refrigerant: T1=10°C=283 K The inlet pressure is: P1=100…

Q: R-410A

A: V=10l=.01m3T1=-10oCx1=.8T2=40oCWe=36kJ/kg from the R140 saturation table at T1=-10oC…

Q: R-134a fills a 0.1-m³ capsule at 20°C, 200 kPa. It is placed in a deep freezer, where it is cooled…

A: Soln:- C. v. R- 134a out to the -20°c space. Energy equation :-  m(u2-u1) = 1Q2- 1W2 Actual process…

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.