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A compound bar having steel rod of diameter 35mm and solid copper of diameter 20mm and aluminiu square rod is as shown in fig. Find change in length of bar. Take Modullus of elasticity Es=210

Ec=11GPaandEal=70GPa

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 Data: Es=210kN/mm2,Ec=110GPa and EAl=70GPa  Find: P,δL  To find unknown force P ,  Fx=0 30+P5+10=0 P25=0 P=25kN

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