A layer of water (n = 1.333) floats on carbon tetrachloride (n = 1.461) contained in an aquarium. To the nearest degree, what is the critical angle at the interface between the two liquids?
a. 88°
b. 78°
c. 66°
d. 58°
e. 43°
c
Physics & Space Science
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A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.8°, the maximum permissible torque is approximately:
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