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clc
clear
printf("example 5.9 page number 191\n\n")
//to find the surface temperature of earth
T_sun = 5973 //in degree C
d = 1.5*10^13 //in cm
R = 7.1*10^10; //in cm
T_earth = ((R/(2*d))^0.5)*T_sun;
printf("Temperature of earth = %f C",T_earth-273)
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