Outgassing refers to the formation of an atmosphere by the attraction of gases from the surrounding nebula
a. True
b. False
Indicate whether the statement is true or false
False
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The source of energy that keeps the Sun shining today is
A) nuclear fission. B) nuclear fusion. C) gravitational contraction. D) chemical reactions.
A typical protostar may be several thousand times more luminous than the Sun. What is the source of this energy?
A) Chemical combustion of hydrocarbons B) Nuclear fusion in its core C) From the release of gravitational energy as the protostar continues to shrink D) The ionization of the gas as it heats up E) From nearby hot stars or supernovae that have initiated the star formation process
The main limitation on the efficiency of heat engines is due to
A) the second law of thermodynamics. B) friction in the moving parts. C) reaction forces due to Newton's third law. D) the first law of thermodynamics. E) environmental extremists.
The following statement describes which subatomic particle best?
It is electrically charged. A) an electron B) a proton C) a neutron D) A and B E) B and C