A 1.2 3 2.4-m sheet of plywood is temporarily held by nails at D and E and by two wooden

Chapter 4, Problem 4.66

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A \(1.2 \times 2.4-\mathrm{m}\) sheet of plywood is temporarily held by nails at D and E and by two wooden braces nailed at A, B and C. Wind is blowing on the hidden face of the plywood sheet, and it is assumed that its effect may be represented by a force Pk applied at the center of the sheet. Knowing that each brace becomes unsafe with respect to buckling when subjected to a 1.8-kN axial force, determine (a) the maximum allowable value of the magnitude of P of the wind force, (b) the corresponding value of the z component of the reaction at E. Assume that the nails are loose and do not exert any couple.