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3. The compound shaft shown consists of two steel [Gare connected at flange B and securely attached to rigid supports at A and C. Pipe (1)has an outside diameter of 115 mm, a polar moment of inertia of 6.2 × 106 mm', and length of 5.6 m. Pipe (2) has an outside diameter of 170 mm, a polar moment of inertia of 22 x 106 mm, and length of 10.3 m. Each steel pipe has an allowable shear stress of130 MPa. Determine the magnitude of the allowable torque T that can be applied to the flange at B.80 GPa] pipes (1) and (2) that

Fig: 1

Fig: 2