For the following problem, unless noted otherwise use a modulus of rigidity G of 12,000,000 psi (83 000 MPa) for steel and 4,000,000 psi (28 000 MPa) for aluminum.
A hollow shaft is produced by boring a 150-mm-diameter concentric core in a 225-mm-diameter solid circular shaft. Compute the percentage of the torsional strength lost.
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