Which of the following types of galaxies is the most common type of galaxy found in large clusters?
A) spirals
B) ellipticals
C) irregulars
B) ellipticals
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Compared with a mercury barometer, the column height for a water barometer would be
A) lower. B) higher. C) the same.
Two large non-conducting plates of surface area A = 0.25 m2 carry equal but opposite charges Q = 75 ?C. What is the energy density of the electric field between the two plates?
A) 1.7 × 107 J/m3 B) 5.1 × 1015 J/m3 C) 3.4 × 107 J/m3 D) 0 E) 2.5 × 1015 J/m3
According to Gwen back on Earth, about how long does it take Jackie to reach Vega?
A) about a month B) about 10 years C) about 25 years D) about 100 years E) about 1,000 years
Which of the following best describes the fundamental difference between two different chemical elements (such as oxygen and carbon)?
A) They have different numbers of protons in their nucleus. B) They have different names. C) They have different numbers of electrons. D) They have different atomic mass numbers.