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//Design a timber beam is to carry a load of 5 kN/m over a simply supported span of 6 m. Permissible stress in timber is 10 N/mm2. Keep depth twice the width.
//variable declaration
w=(5) //KN/m
L=(6) //m
M=w*1000000*(L**2)/8 //Maximum bending moment**N-mm
//Let b be the width and d the depth. Then in this problem d = 2b.
//Z=b*(d**2)/6=2*(b**3)/3
f=10 //N/mm^2
//f*Z=M
b=(((M*3)/(2*f))**(0.3333))
printf("\n b= %0.0f mm",b)
d=2*b
printf("\n d= %0.0f mm",d)
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