Suppose that you are looking at the sky at about midnight on the winter solstice. Which star will be nearest to your meridian?
A) Alpha Centauri
B) Sirius
C) Spica
D) Deneb
B
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Mars has two moons, Phobos and Deimos, that are most similar in character to
A) small asteroids. B) comets. C) Earth's Moon. D) particles in the rings of Saturn.
The hydrogen atom consists of a proton of mass 1.67 × 10-27 kg and an orbiting electron of mass 9.11 × 10-31 kg. In one of its orbits, the electron is 5.3 × 10-11 m from the proton
What is the mutual attractive gravitational force between the electron and proton? A) 1.8 × 10-47 N B) 3.6 × 10-47 N C) 5.4 × 10-47 N D) 7.0 × 10-47 N E) 9.3 × 10-47 N
On a clear night when an observer in Los Angeles sees a first quarter Moon an observer in London would see
a. a full moon. b. a first quarter moon. c. a new moon. d. a third quarter moon. e. any of the above, depends on the time
The relation between the Doppler shift of galaxies and their distances is called
A) the cosmological principle. B) Hubble's law. C) special relativity. D) Olbers's paradox. E) general gelativity.