A pinned-end column of length L = 2.1 m is constructed of steel pipe (E = 210 GPa) having inside diameter d1 = 60 mm and outside diameter d2 = 68 mm (see figure.) A compressive load P = 10 kN acts with eccentricity e = 30 mm.
(a) What is the maximum compressive stress (max in the column?
(b) If the allowable stress in the steel is 50 MPa, what is the maximum permissible length Lmax of the column?

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