According to the nebular theory, how did the asteroid belt form?
A) It is made of planetesimals that formed beyond Neptune's orbit and never accreted to form a planet.
B) It is made of planetesimals between the orbits of Mars and Jupiter that never formed into a planet.
C) It consists of objects that fragmented from the protosun during a catastrophic collision early in the formation of the solar system.
D) It is made of planetesimals formed in the outer solar system that were flung into distant orbits by encounters with the jovian planets.
E) It is material left over from the interstellar cloud that never contracted with the rest of the gases to form the solar nebula.
B
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The terrestrial planets are thought to have formed by accreting solid planetesimals all with about the same composition. This means
a. they were initially molten forming an iron core first, then they accreted a silicate crust later. b. they were initially molten forming a silicate core first, then they accreted an iron crust later. c. they were initially collections of solid particles which melted then differentiated into a high density iron metal core and low density silicate crust. d. they were initially collections of solid particles which melted then differentiated into a high density silicate core and low density iron metal crust.
Meters: Decreasing the resistance of an ammeter's shunt resistance
A. allows it to measure a larger current at full scale deflection. B. allows it to measure a smaller current at full scale deflection. C. enables more current to pass directly through the galvanometer. D. converts it to a voltmeter.
What is the frequency of the wave?
A. 80 Hz
B. 50 Hz
C. 120 Hz
D. 140 Hz
E. 160 Hz
Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from her in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Beta moving?
A. 0.82c B. 0.70c C. 0.94c D. 0.35c E. 0.57c