Which portion(s) of the spectrum represent(s) reflected sunlight?
A) 1 only
B) 2, 3, and 4
C) 3 and 6
D) the entire spectrum
B) 2, 3, and 4
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Suppose that Hubble's constant were 20 kilometers per second per million light-years. How fast would we expect a galaxy 100 million light-years away to be moving? (Assume the motion is due only to Hubble's law.)
A) away from us at 20,000 km/s B) away from us at 200 km/s C) away from us at 2,000 km/s D) toward us at 2,000 km/s
Two spaceships are traveling through space at 0.60 c relative to the Earth. If the ships are headed directly toward each other, what is their approach velocity, as measured by a person on either craft?
A) 4.2c B) 1.2c C) c D) 0.60c E) none of the given answers
Which of the following best describes the axes of a Hertzsprung-Russell (H-R) diagram?
A) surface temperature on the horizontal axis and luminosity on the vertical axis B) mass on the horizontal axis and luminosity on the vertical axis C) surface temperature on the horizontal axis and radius on the vertical axis D) mass on the horizontal axis and stellar age on the vertical axis E) interior temperature on the horizontal axis and mass on the vertical axis
As shown in the diagram, you've just thrown a baseball toward Al at 100 km/hr, while he is moving away from you to the right at 90 km/hr. According to Al, what is the baseball doing?
A) traveling to the right at 10 km/hr B) traveling to the right at 100 km/hr C) staying stationary D) traveling to the right at 190 km/hr