The aluminum rod ABC (E = 10.1 x 106 psi), which consists of two cylindrical portions AB and BC is to be replaced with a cylindrical steel rod DE (E = 29 x 106 psi) of the same overall length. Determine the minimum required diameter d of the steel rod if its vertical deformation is not to exceed the deformation of the aluminum rod under the same load.

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5 i in. 19kips 24in. A -2.5 in B -2.5in. C D E kips -d 5 i in. 19kips 24in. A -2.5 in B -2.5in. C D E kips -d