A square steel plate of side 40cm has a circular hole of radius 5cm drilled through its centre. The plate is subjected to a compressive force of 6.0kN normal to its surface.
(i) Compute the net area of the plate that actually transmits the force.
(ii) Determine the pressure developed on the plate.
(iii) If the allowable working pressure for this grade of steel is 1.5×105Pa, calculate the maximum normal force that can be applied on the perforated plate without exceeding the allowable pressure.