What property of dark matter leads to it keeping galaxy clusters together?
a) It produces gravity due to its mass.
b) It contains a cosmological constant.
c) It produces the electromagnetic force due to its charge.
d) It carries the strong force.
e) It has high adhesion so galaxies stick to it.
Answer: a) It produces gravity due to its mass.
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Which is the binary system, and what is the type, in the above figure?
a. Alcor A and B, spectroscopic
b. Alcor and Mizar, visual binary
c. Mizar A and B, visual binary
d. None of the other choices are correct.
Which of the following energy sources might supply energy for life on the surface of Titan?
A) asteroid and comet impacts B) cryovolcanism C) chemical reactions in the upper atmosphere D) all of these
Exhibit 14-1
A square of side 
is removed from one corner of a square sandwich that has sides of length L. The center of mass of the remainder of the sandwich moves from C to C'.
?
?
Use this exhibit to answer the following question(s).
Refer to . The displacement of the y coordinate of the center of mass (from C to C') is
A.
.B.
.C.
.D.
.E.
.Car B is traveling twice as fast as car A, but car A has twice the mass of car B. Which car has the greater kinetic energy and by what factor is it greater?