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A wire of length 1 m and radius 4 mm is fixed at its top end while the bottom end is rotated through a twist angle of 30 degrees. Find the angle of shear (in degrees).

1. 0.120
2. 1.20
3. 120
4. 0.0120

Correct answer: 0.120

Solution

Using phi = r*theta/L = (4e-3)(30)/1 = 0.12 degrees gives the angle of shear.

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