Which of the following units is used to express atmospheric pressure?
a. Torr only
b. Millibar only
c. Inches of Hg only
d. All of these
d
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Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists. B) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit. C) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt. D) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit.
Which of the following types of electromagnetic radiation has the smallest frequency?
a. x-rays b. visible light c. radio d. gamma-rays e. infrared radiation
Which moon of Uranus has the strangest terrain? What is a possible explanation for its jumbled appearance?
What will be an ideal response?
What mass should be attached to a vertical spring (k = 39.5 N/m) so that the natural vibration frequency of the system will be 1.00 Hz?
A) 2.00 kg B) 1.56 kg C) 1.00 kg D) 6.29 kg E) 39.5 kg