The shaft is supported by a smooth thrust bearing at A and a smooth journal bearing at B....

The shaft is supported by a smooth thrust bearing at A and a smooth journal bearing at B. If P = 5 kN and the shaft is made from steel having an allowable normal stress of σallow = 150 MPa and an allowable shear stress τallow = 85 MPa, determine the required minimum wall thickness t of the shaft to the nearest millimeter to safely support the load.