5-81 The shaft is made of A-36 steel and is fixed at end D, while end A is allowed to rotate 0.005 rad when the torque is applied. Determine the torsional reactions at these supports.

The answer is "7.73 kip-ft".

Explanation:

Using this equation, calculate the polar moment of shaft inertia:

Equate the number of moments in x:

Calculate the torsional response at A using the superposition method:

The torsional answer in help A is  12.27 kip- ft.  It replace the necessary equation values:

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