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//Safety of dam
//refer fig. 3.16
Rx=300 //kN (towards right)
Ry=100-1200-400 //kN (Downwards)
//taking moment about O
MO=300*3-100*1+1200*2+400*5
//assume that the resultant cut the base at a distance of x from O
x=MO/Ry //m
printf("x=%.3f m lies in the middle third of base.Hence dam is safe",-x)
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