What part of a comet points most directly away from the Sun?
A) the nucleus
B) the coma
C) the jets of gas
D) the plasma tail
E) the dust tail
D
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Instructions: On occasion, the notation 
will be a shorthand notation for 
.
A vector,
, when added to the vector 
yields a resultant vector which is in the positive y direction and has a magnitude equal to that of 
. What is the magnitude of ?
A. 3.2
B. 6.3
C. 9.5
D. 18
E. 5
Suppose you have two small photographs of the Moon. Although both look the same at small size, when you blow them up to poster size one of them still looks sharp while the other one becomes fuzzy (grainy) looking
Which of the following statements is true? A) The one that still looks sharp at large size has better (smaller) angular resolution than the one that looks fuzzy. B) The one that looks fuzzy at large size has better angular resolution (smaller) than the one that looks sharp. C) Both photographs have the same angular resolution, because they were both printed at the same sizes in each case. D) Both photographs have the same angular resolution, because they are both photographs of the same object.
Glaciers lose mass by
A) crevassing. B) calving. C) melting and calving. D) melting and crevassing.
Electrons orbiting the nucleus of an atom are grouped into energy bands known as
a. tracks. b. slots. c. shells. d. tunnels.