A rod of length D sits at rest on a frictionless table. A ball of mass A strikes the end of the rod with a U speed v and rebounds with a speed v/2 causing the rod to rotate counterclockwise around a fixed axis at the middle. The rotational inertia of the rod is I. What angular velocity w of the rod after the conclusion?
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The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

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Which configuration would produce an electric current? a) rotate a coil of copper wire between two magnets. b) connect a wire between a copper and zinc strip sitting in a beaker of water. c) connect a wire to the (+) positive end of a battery and the other end to a light bulb. d) connect a wire to the negative end of a battery and the other end to a light bulb.