1-6.
The normally distributed force 
N is applied to the
system as shown. If both beams AB and BC must have the same
cross sectional area, and the allowable yield stress of the beams is 
MPa, what is the minimum thickness that
they must have if their widths are 15 mm? Let the maximum probability of
failure be 10-4 and 
. Also, assume 
and 
are
independent variables. (Ans. 
mm)
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