A laser beam strikes a plane's reflecting surface with an angle of incidence of 43°. What is the angle between the incident ray and the reflected ray?
A)
43°
B)
86°
C)
45°
D)
90°
E)
0°
B
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The modern theory of dark energy arises from observations showing that
A) galaxies spin at slower than expected rates. B) superclusters are collapsing. C) the speed of light is not exactly constant. D) galaxies are accelerating away from each other.
At about what fraction of the speed of light do today's spacecraft travel?
A) 1/10 B) 1/100 C) 1/10,000 D) 1/1,000 E) 1/2
A +6.0 magnitude star is brighter than a +3.0 magnitude star
Indicate whether the statement is true or false
Fire a cannonball with enormous speed from a hypothetical cannon and it curves due to gravity. Shine a light from a flashlight parallel to the cannon and it
A) follows a straight-line path. B) curves downward as much as the cannonball. C) curves slightly upward.