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Assuming the thickness of the bracket as b,
The area of cross section will be A=0.05*b
Moment of inertia will be I=b*(0.05)^3/12
The tensile stress is given by equation:
Sn_max=(P/A)+((M*c)/I)
b=0.00900 m
9 mm is required to limit the stress at 70 MN/m^2
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