Find the speed of light in the plastic
Light traveling in air is incident on the surface of a block of plastic at an angle of 72.7° to the normal and is bent so that it makes a 57.1° angle with the normal in the plastic. Find the speed of light in the plastic.
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A square box section with 50-mm sides and 2.5-mm wall thickness. Compare the torsional rigidities and the maximum shearing stresses for the same applied torque.
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