The colors seen on the shiny side of a CD or DVD are due to
A. Simple reflections of light
B. Colors embedded in the shiny coating
C. Diffraction due to the holes in the coating
D. Reflections from both surfaces of the disk.
Answer: C. Diffraction due to the holes in the coating
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A 100 kg football linebacker moving at 2 m/s tackles head-on an 80 kg halfback running 3 m/s. Neglecting the effects due to digging in of cleats
A) this is a simple example of an elastic collision. B) the linebacker will drive the halfback backward. C) neither player will drive the other backward. D) the halfback will drive the linebacker backward.
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