Between us and the Galactic center, the Milky Way has a mass of
A) several hundred thousand suns.
B) one to two million suns.
C) 250 million suns.
D) 100 billion suns.
E) over a trillion suns.
D
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Which of the following is not a real difference between asteroids and comets?
A) Asteroids orbit the Sun while comets just float randomly around in the Oort cloud. B) Most asteroids are located much nearer to the Sun than most comets. C) It is thought that comets are far more numerous than asteroids. D) Asteroids are made mostly of rock and comets are made mostly of ice.
Simple Pendulum: A simple pendulum takes 2.00 s to make one compete swing. If we now triple the length, how long will it take for one complete swing?
A. 6.00 s B. 3.46 s C. 2.00 s D. 1.15 s E. 0.667 s
How was Edwin Hubble able to use his discovery of Cepheids in Andromeda to prove that the "spiral nebulae" were actually galaxies external to the Milky Way?
A) From the period-luminosity relation for Cepheids, he was able to determine the distance to Andromeda. He showed that it was far outside the Milky Way Galaxy. B) He used main-sequence fitting to determine the distances to the Cepheids. He showed that Andromeda was far outside the Milky Way Galaxy. C) There are no Cepheids in the Milky Way, so his discovery proved that Andromeda had to be in another galaxy. D) As a Cepheid is a type of luminous galaxy, Hubble's discovery of Cepheids in Andromeda proved that it was a separate galaxy from the Milky Way. E) He measured the parallaxes of the Cepheids in Andromeda to determine their distances. He showed that Andromeda was far outside the Milky Way Galaxy.
The element first found in the Sun's spectrum, then on Earth 30 years later, is:
A) hydrogen. B) helium. C) solarium. D) technetium. E) aluminum.