6.28. A square shaft has 42.0-mm sides and the same cross-sectional area as shafts having circular and equilateral triangular cross sections. If each shaft is subjected to a torque of 1.00 kN m, determine the maximum shear stress for each of the three shafts. .

2. Solve the following problem Determine the maximum torque T that can be resisted by two shafts with a circular section of outer diameter of 100 mm. For the first shaft, the section is solid (no holes). For the second shaft, the section is hollow with an inner diameter of 75 mm. Use an allowable shear stress Tallow = 100 MPa and provide a drawing of the shear stress distribution on both sections. Rug'd max T for solid shaft Tallow = 100MP₂ diameter d loomm T hole diameter dinner = 75mm max T for hollow shaft 2D stress distribution

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hello dear teachers please help me this homework questions. considering the time limit I have less 30min