initial commit / add all books

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diff --git a/2873/CH3/EX3.20/Ex3_20.sce b/2873/CH3/EX3.20/Ex3_20.sce
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+// Display mode

+mode(0);

+// Display warning for floating point exception

+ieee(1);

+clear;

+clc;

+disp("Engineering Thermodynamics by Onkar Singh Chapter 3 Example 20")

+v1=0;//initial volume of air inside bottle in m^3

+v2=0.5;//final volume of air inside bottle in m^3

+p=1.0135*10^5;//atmospheric pressure in pa

+disp("displacement work,W=p*(v1-v2)in N.m")

+W=p*(v1-v2)

+disp("so heat transfer(Q)in N.m")

+disp("Q=-W")

+Q=-W