If the tubular shaft is made from material having an allowable shear stress of allow =

If the tubular shaft is made from material having an allowable shear stress of τ_allow = 90 MPa, determine the required minimum wall thickess of the shaft to the nearest millimeter. The shaft is supported by bearing at A and E and has an outer diameter of 160 mm.

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B C D A 40 kNm 60 kNm E 30 kNm 50 kNm