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clc;
warning('off');
printf("\n\n example4.2 - pg100");
// given
T1=0; //[degC]
T2=10; //[degC]
km=17.17; //[W/m*K]
l=1; //[m]
r2=1.1875;
r1=1.0335;
deltaT=T1-T2;
// using the formula Qr=-km*((2*pi*l)/ln(r2/r1))*deltaT;
Qr=-km*((2*%pi*l)/log(r2/r1))*deltaT;
printf("\n\n qr=%fW\n the plus sign indicates that the heat flow is radially out from the center",Qr);
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