_____ are circular bulges on Venus up to 1600 mi in diameter bordered by fractures, volcanoes, and lava flows
A) Coronae
B) Maria
C) Breccias
D) Anorthosites
A
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Sometimes, when a theory has been refined, tested, and confirmed so often that scientists have great confidence in it, it is called__________
A) parallax B) a hypothesis C) a natural law D) a model
A heavy weight is supported by two cables that exert tensions of magnitude 
and 
. Which statement is correct?
?
?
A.
= 
.B.
= 
.C.
>.D.
<.E.
Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
a. Ellen, because w2 is directly proportional to the constant multiplying the displacement and to the mass. b. Ellen, because w2 is directly proportional to the mass. c. Mary, because w2 is directly proportional to the constant multiplying the displacement and to the mass. d. Mary, because w2 is directly proportional to the mass. e. Mary, because the second derivative of an oscillatory function like sin(wt) or cos(wt) is always proportional to the negative of the original function.
This Hubble Space Telescope photo shows the bright active galactic nucleus in the center of galaxy M87. What is the long bluish streak coming out of it?
A) a "jet" of material being shot out at high speed B) the blueshifted light of gas that is moving toward us C) a stream of material that is falling in toward an accretion disk D) a spiral arm filled with regions of active star formation