The stars in our sky twinkle in brightness and color because of
A) turbulence in the Earth's atmosphere.
B) rapid changes in the brightnesses and colors of stars caused by changes in their spectra.
C) light pollution.
D) the bubbling and boiling of gases on the surfaces of stars.
A
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Which of the following products of ratios gives the conversion factor to convert miles per hour 
to meters per second 
?
A.
B.
C.
D.
E.
Describe a lunar eclipse
What will be an ideal response?
In addition to Mars, which jovian moon shows some promise of life, with a surface not that different from the Arctic Ocean?
A) Titan B) Miranda C) Europa D) Io E) Triton
What is the inductance of a series RL circuit in which R = 1.0 K? if the current increases to one-third of its final value in 30 ?s?
a. 74 mH b. 99 mH c. 49 mH d. 62 mH e. none of the above