Which of the fields are physically impossible and why?
A. This field violates Faraday’s law.
B. This field violates Gauss’s law.
C. This field violates both of the above laws.
D. This field is physically possible.
B. This field violates Gauss’s law.
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When sound travels faster near the ground than above, bending of sound tends to be
A) upward. B) downward. C) to the left. D) to the right. E) none of the above
The index of refraction for crown glass, common in eyeglasses, is 1.52. The index of refraction of a particular plastic lens is 1.76. Light bends more in the
A) crown glass. B) plastic lens. C) same speed in each. D) need more information
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The acceleration of the ball in m/s2 is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
Does the cold streaming gas heat up or cool down when it enters the central cloud?
This frame from Figure 16.12 is from a supercomputer model of the formation of one of the first stars in the universe. Color indicates gas temperature: Blue and green represent cool gas (100—300 K), orange and red represent warm gas (500—3000 K), and yellow represents gas at intermediate temperatures (300—500 K). Use the information in the figure to answer the following questions.