A beam of light, traveling in air, strikes a plate of transparent material at an angle of incidence of 56°. It is observed that the reflected and refracted beams form an angle of 90°. What is the index of refraction of this material?
A) n = 1.43
B) n = 1.53
C) n = 1.40
D) n = 1.48
E) n = 1.44
D
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Although it is highly unlikely to happen, suppose that we suddenly discovered that all these years we'd been wrong about the distance from Earth to the Sun, and it is actually 10% greater than we'd thought. How would that affect our estimate of the distance to the Andromeda Galaxy?
A) It would mean the distance to the Andromeda Galaxy is also 10% greater than we thought. B) It would not have any effect on our estimate of the distance to the Andromeda Galaxy. C) It would mean the distance to the Andromeda Galaxy is 10% less than we thought. D) It would mean that all the objects we've assumed are standard candles really are not good standard candles, and therefore that we have no idea of the true distance to the Andromeda Galaxy.
A T-shaped simple beam has a cable with force P anchored at B and passing over a pulley at E, as shown in the figure. The bending moment just left of C is 1.25 kN?m. The cable force P is approximately:
(A) 2.7 kN
(B) 3.9 kN
(C) 4.5 kN
(D) 6.2 kN
The following images show the four terrestrial planets in our solar system. Rank the planets from left to right based on the strength of the greenhouse effect occurring at their surfaces, from strongest to weakest.
A bullet train moving in the +x direction with x-velocity ? relative to the ground has lights on the roof of the head and tail cars that blink simultaneously in the train frame. The head car’s light happens to be passing by an observer on the ground just as it blinks. The observer sees the light from the tail car at a different time, but after correcting for the light travel time from the tail car, the observer concludes that in the ground frame
A. The tail car’s light blinked before the head car’s light. B. The head car’s light blinked before the tail car’s light. C. Both lights blinked simultaneously. D. One cannot determine unambiguously which event occurs first in the ground frame.