A beam of light in air is incident at an angle of 46° to the surface of a rectangular block of clear plastic (n = 1.46). The light beam first passes through the block and re-emerges from the opposite side into air at what angle to the normal to that surface?
a. 23°
c. 46°
b. 59°
d. 30°
C
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A disk and a hoop of the same mass and radius are released at the same time at the top of an inclined plane. Which object reaches the bottom of the incline first?
A) The hoop B) The disk C) Both reach the bottom at the same time. D) It depends on the angle of inclination. E) It depends on the length of the inclined surface.
Two 10¢ coins (dimes) carrying identical charges are lying 2.5 m apart on a table. If each of these coins experiences an electrostatic force of magnitude 2.0 N due to the other coin,
how large is the charge on each coin? (k = 1/4??0 = 9.0 × 109 N ? m2/C2) A) 5.2 ?C B) 26 ?C C) 2.6 ?C D) 52 ?C E) 6.7 ?C
Most active galactic nuclei are powered by
A) supermassive black holes. B) a large number of supernovae. C) mergers of compact objects. D) black hole mergers. E) extra-terrestrial civilizations.
If an elephant grows proportionally to twice its height, its weight would be multiplied by about
A) 2. B) 4. C) 6. D) 8. E) none of the above