What kind of pressure supports a white dwarf?
A) neutron degeneracy pressure
B) electron degeneracy pressure
C) thermal pressure
D) radiation pressure
E) all of the above
B
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Jupiter and the other jovian planets are sometimes called "gas giants." In what sense is this term misleading?
A) They actually contain relatively little material in a gaseous state. B) The materials they are made of are not the kinds of thing we usually think of as gases. C) They are not in any sense "giants." D) Actually, it's a great description because these worlds are big and gaseous throughout.
When a positive charge is released and moves along an electric field line, it moves to a position of
A. lower potential and lower potential energy. B. lower potential and higher potential energy. C. higher potential and lower potential energy. D. higher potential and higher potential energy. E. greater magnitude of the electric field.
Some people wish that we lived in a recollapsing universe that would eventually stop expanding and start contracting. For this to be the case, which of the following would have to be true (based on current understanding)?
A) Dark energy is the dominant form of energy in the cosmos. B) Dark energy does not exist and there is much more dark matter than we are aware of to date. C) Neither dark energy nor dark matter really exist. D) Dark energy exists but dark matter does not.
Three particles are placed in the xy plane. A 30-g particle is located at (3, 4) m, and a 40-g particle is located at (?2, ?2) m. Where must a 20-g particle be placed so that the center of mass of the three-particle system is at the origin?
a. (?3, ?1) m b. (+1, +3) m c. (+3, ?1) m d. (?1, ?3) m e. (?0.5, ?2) m