needs a summary of the problem statement, the relevant assumptions, formulas, an
ID: 2073444 • Letter: N
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needs a summary of the problem statement, the relevant assumptions, formulas, and property values required to complete the problem
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2. A system is initially at conditions of P 200 kPa and V0.1 m3. Heat is now added to the system, and the system expands in a constant pressure process. At the end of the process the volume has doubled (a) Calculate the work transferred during the process. (b) During the process the internal energy of the system increases by 200 k.J; kinetic and potential energy remains constant. Determine the net heat transfer during the processExplanation / Answer
Initial pressure P1 = 200Kpa.
Initial volume = V1 = 0.1 m3
Heat added in the process of constant pressure. P = Constant.
Final volume = two times the initial volume =V2= 2*0.1 = 0.2 m3.
a)
Work done in constant pressure process = W = p*dV = 200*103 *(0.2-0.1) = 20000 J.
b)
Any process in which system undergoes a change of state, the net energy will be stored in a system according to the first law of thermodynamics if we apply for a process. Here the internal energy ( U ) of a system increases by 200 KJ = 200000 J During the process in which system undergoes a change of state.
Increase in internal energy = U2 - U1 = 200000 J.
We have already calculated that the work done by the system is W= 20000 J.
According to first law of thermodynamics, heat transfer to the system Q is written as
Q= (U2 - U1) +W.
heat transfer = change in internal energy + work done.
Q = 200000+20000 = 220000 J =220 KJ.
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