The second law of thermodynamics states that:
a. energy can be transformed into matter and, because of this, we can get something for nothing
b. energy can only be destroyed during nuclear reactions, such as those that occur inside the sun
c. if energy is gained by one region of the universe, another place in the universe also must gain energy in order to maintain the balance of nature
d. energy tends to become increasingly more disorganized
e. energy is the capacity to do work
d
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In the equation: Number of Civilizations = Np × flife × fcivilization × fnow what do we mean by fnow?
A) the fraction of planets with civilizations on which the civilizations exist now B) the fraction of time since the Big Bang represented by the present era C) the fraction of all species ever to exist that we currently are aware of D) the fraction of planets in the galaxy on which a civilization could theoretically develop now E) the fraction of civilizations in the universe that currently are sending messages to us
What is a protostar?
A) a star that is still in the process of forming B) an intermediate-mass star C) a star that has planets D) a star in its final stage of life
The smaller portion of a solution is generally called the
a. salt. b. solute. c. molar concentrate. d. solvent.
A drag racer starts from rest and accelerates at 8.0 m/s2 for the entire distance of 400 m (1/4 mile). What is the speed of the race car at the end of the run?
a. 32 m/s c. 64 m/s b. 40 m/s d. 80 m/s