Question: Two same-size metal posts, one aluminum and one copper, are subjected to equal shear stresses. (a) Which post will show the larger deformation angle, (1)

Two same-size metal posts, one aluminum and one copper, are subjected to equal shear stresses.
(a) Which post will show the larger deformation angle, (1) the copper post or (2) the aluminum post? Or (3) Is the angle the same for both? Why?
(b) By what factor is the deformation angle of one post greater than the other?

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