According to the planetary migration model, the jovian planets are thought to have formed
A) in the orbit where they are now.
B) further from the Sun than they are now.
C) in another solar system.
D) closer to the Sun than they are now.
E) none of the above.
B
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Astronomers believe that dark matter exists because
A. the galaxies in clusters move slower than expected on the basis of the material visible in them. B. they can detect it with radio telescopes. C. the outer parts of galaxies rotate faster than expected on the basis of the material visible in them. D. it is the only way to explain the black holes in active galaxies. E. All of these choices are correct.
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 Exhibit 14-1. The distance from C to C' is
A.
.B.
.C.
.D.
.E.
.Two liters of a perfect gas are at 0°C and 1.0 atm. If the gas is nitrogen, N2, determine:
(a) the number of mol; (b) the number of molecules; and (c) the mass of the gas.
Which type of hydrogen is referred to as "heavy hydrogen"?
a. Tritium b. Hydronium c. Protium d. Deuterium