The measured value of the speed of light is about 300,000 km/s. Suppose a futuristic space train is traveling at 200,000 km/s with its headlights on. If you could measure the speed of the light from the headlights, you would find it to be
A) 300,000 km/s.
B) 200,000 km/s.
C) 100,000 km/s.
D) 500,000 km/s.
A) 300,000 km/s.
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What behavior do galactic rotation curves exhibit to suggest the existence of dark matter in an extended halo?
a. Small velocities are seen at large distances from the galactic center. b. Small velocities are seen at distances close to the galactic center. c. Large velocities are seen at large distances from the galactic center. d. Large velocities are seen at distances close to the galactic center.
Quantum uncertainties are the source of
A) the unpredictability of radioactive decay. B) the unpredictability of games of chance such as flipping coins. C) Both of the above. D) None of the above.
Of the mass ranges below, which represents the most common stars?
A) 0.08 to 0.5 MSun B) 0.5 to 2 MSun C) 2 to 10 MSun D) 10 to 150 MSun
The presence of a Mercurian magnetic field surprised the planetary scientists on the Mariner 10 team because:
A) Mercury is low in iron. B) Mercury spins to rapidly to produce a stable dynamo. C) It's still too hot for its core to have differentiated. D) The dynamo theory predicted that Mercury was spinning too slowly for one. E) Mercury lacks an iron core.