An airplane flying faster than the speed of sound of 340 m/s produces a shock wave with an angle ?0 = 50°. What is the speed of the plane?
A)
490 m/s
B)
530 m/s
C)
390 m/s
D)
440 m/s
E)
405 m/s
D
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According to the 2013 report from which body (which is informed by the world's most accomplished atmospheric scientists) have global temperatures been increasing in recent years?
A) Association of National Talk Show Hosts B) National Association of Chemists C) Mobil Oil Corporation D) Intergovernmental Panel on Climate Change
According to Aristotelian physics, what outside influence acts on a stone while it falls?
A) None. B) Fire. C) The Olympic gods. D) Acceleration. E) Gravity.
The sun is 
km from the Earth. How long does it take for light to travel this distance?
A. 
B. 
C. 
D. 
E. 
Algol consist of a 3.7 MSun main-sequence star and a 0.8 MSun subgiant. Why does this seem surprising, at least at first?
A) The two stars should be the same age, so we'd expect the subgiant to be more massive than the main-sequence star. B) The two stars in a binary system should both be at the same stage of life; that is, they should either both be main-sequence stars or both be subgiants. C) It doesn't make sense to find a subgiant in a binary star system. D) A star with a mass of 3.7 MSun is too big to be a main-sequence star.