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A handle CD is supported by steel control rod AB as shown in Figure Q2 and the load P is applied at the end D.

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A handle CD is supported by steel control rod AB as shown in Figure Q2 and the load P is applied at the end D. The rod AB has a diameter of 30mm and a thickness of 3mm. The modulus of elasticity is 200GPa and the yield strength is 250MPa. It is pin-connected at its ends. Determine; i) the reaction force at C. ii) the load P that can be applied to the handle so that the steel control rod AB does not buckle. iii) the critical stress and factor of safety of column AB. [CO2/PO2/WK3][C4](14 marks) iv) Column AB will be changed to a solid steel rod with an unchanged outer diameter. Explain the critical load, applied load P, and buckling of column AB. [CO3/PO3/WK3][C5](6 marks) riguit w/

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