A two-stage shaft was permanently fixed at the left end and loaded with moments of 30 and 70 kNm as shown in the drawing. Assume G=80 GPa. Calculate and draw the graphs of torsional moments, shear stresses, and the angle of twist: \(M(x), \tau(x), \varphi(x)\). The allowable angle of twist \(\varphi_{dop}=0,2 \ ^o/m\), dimension the diameter of the rod D.
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