Snell's Law: A thin beam of light enters a thick plastic sheet from air at an angle of 32.0° with the normal and continues in the sheet at an angle of 23.0° with the normal. What is the index of refraction of the plastic?
A. 0.74
B. 1.11
C. 1.28
D. 1.36
Answer: D
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Which of the following aluminum alloys is not suitable for welding?
(a) 1100 (b) 3003 (c) 5052 (d) 7075-T6
How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't—Earth's orbital distance plays no significant role in the seasons. B) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same. C) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere. D) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres.
An advantage in evaluating surface integrals related to Gauss's law for symmetric charge distributions is
A) the flux is outward. B) the flux is inward. C) the electric field is of constant magnitude on certain surfaces. D) the charge is always on the surface. E) the electric field is a constant on any surface.
A metal rod is falling toward the surface of the Earth near the equator. As it falls, one end of the rod becomes positively charged due to the motional emf of the rod through the Earth's magnetic field. The rod is oriented so that:
a. the rod is horizontal with the positive end toward the east. b. the rod is horizontal with the positive end toward the north. c. the rod is vertical with the positive end higher. d. the rod is horizontal with the positive end toward the west.