What is the ultimate fate of an isolated white dwarf?
A) It will cool down and become a cold black dwarf.
B) As gravity overwhelms the electron degeneracy pressure, it will explode as a nova.
C) As gravity overwhelms the electron degeneracy pressure, it will explode as a supernova.
D) As gravity overwhelms the electron degeneracy pressure, it will become a neutron star.
E) The electron degeneracy pressure will eventually overwhelm gravity and the white dwarf will slowly evaporate.
A
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A) 8800 V B) 2000 V C) 7200 V D) 4400 V E) 1600 V
During the fusion process, mass is converted into energy
Indicate whether the statement is true or false
A boy on a bicycle rides in a circle of radius 
at speed 
If the boy rides at the same radius 
by what factor must he change his speed in order to triple his centripetal acceleration?
A. 3.0 B. 0.58 C. 0.33 D. 1.7 E. 0.11 F. 9.0
The tail of a comet always points
A) away from the Sun and becomes longest and brightest at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) toward the Sun and disappears at perihelion. E) in the direction of the comet's motion.