Given:
Bending moment, $M = 20$ kNm
Torsion, $T = 40$ kNm
Acceptable ideal stress, $\sigma_{i,acc} = 55$ N/mm$^2$
Diameter of the shaft, $d = 200$ mm
Goal:
1. Calculate the ideal stress ($\sigma_i$) in the shaft.
2. Determine if the calculated ideal stress is
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