How does the best possible angular resolution of a telescope with a 10-meter diameter mirror compare to that of a telescope with a 5-meter diameter mirror?
A) The 10-meter telescope's angular resolution is better by a factor of 2.
B) The 10-meter telescope's angular resolution is better by a factor of 4.
C) The 10-meter telescope's angular resolution is better by a factor of 10.
A) The 10-meter telescope's angular resolution is better by a factor of 2.
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All of the stars we see at night with our unaided eyes are within
A) 10,000 light-years, which is a small portion of our galaxy. B) 100,000 light-years, which encompasses most all of our galaxy. C) 5 million light-years, which encompasses our local group. D) 14 billion light-years, which encompasses the observable universe.
The interior of a greenhouse emits long-wavelength radiation due to its
A) green color. B) plant cell structure. C) transparency. D) relatively low temperature.
An ice skater spins at 3.5 rev/s with his arms are extended. He draws his arms in and spins at 8.3 rev/s. By what factor does his moment of inertia change in the process?
a. 2.4 b. 0.58 c. 0.42 d. 0.12
An object more massive than the Sun, but roughly the size of a city, is a:
A) supernova remnant. B) white dwarf. C) brown dwarf. D) neutron star. E) red dwarf.