The rings of Neptune:
A) were confirmed by the Voyager 2 in 1989.
B) number five, with three narrow, two more diffuse.
C) all lie within Neptune's Roche Limit.
D) often appear as clumpy ring arcs, rather than complete and symmetrical.
E) All of these are correct.
E
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During which of the following phases of life is a star's pressure and gravity out of equilibrium?
A) main sequence B) helium core fusion C) white dwarf D) red giant E) A star is never out of equilibrium.
An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:
a. can have either a positive or a negative charge. b. must be neutral. c. must have a positive charge. d. must have a negative charge.
Three resistors,
are connected in series to a 9.0 V battery. What is the power dissipated by 
A. 2.0 W B. 4.0 W C. 5.1 W D. 9.0 W E. 2.3 W
A "burning glass" used to concentrate sunlight in a tiny spot is a
A) converging lens. B) diverging lens. C) either of these D) neither of these