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Two steel shaft each of length L and outside diameter D are subjected to uniform torsion. The first shaft is solid while the second one is hollow with inside diameter D/2. The ratio of the strain energies that these two shafts can absorb without exceeding a maximum allowable shear stress, would be

[A].	16?15	[B].	16?15
[C].	3?4	[D].	7?8
[E].	8?7

Answer: Option A

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