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QUESTION 2: Torsional moments of \( 3 \mathrm{M} \) and \( \mathrm{M} \) intensity are applied to the compound bar made of two different materials (core steel and plated copper). Shear modulus for steel and copper are \( \mathrm{G}=80 \mathrm{GPa}, \mathrm{Ga}=30 \mathrm{GPa} \), shear safety stresses (Tem) \( 80 \mathrm{MPa} \), (Tem) \( 50 \mathrm{MPa} \). Find the torsional moment Mb that the system can safely carry and calculate the total angle of rotation (CA) in the bar (30p).

Let us take that copper take moment Mb1 For not exceed permissible limit Mb1×rmaxJC=?p1