The ability of a telescope to show two very close objects separately is called its ________.
A. focal length
B. light-gathering power
C. resolving power
D. magnification
Answer: C
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What is the direction of 
at point O?
A. A B. B C. C D. D E. E F. F T. Zero
Which of the following is a main sequence star hotter than the Sun? (Note: the Sun is a G2V star.)
A. O2II B. G1II C. K2V D. G1V E. G2III
Which statement about the ecliptic is FALSE?
A) The Sun appears to move about a degree per day eastward long it. B) It is tilted 23.5 degrees with respect to the equator. C) The year is marked by the Sun's return to the same place along it. D) The Moon can never leave it, but moves twelve times faster than the Sun. E) The major planets stay close to it, but not always on it.
A 45.0-kg sample of ice is at 0.00° C. How much thermal energy is needed to melt it? For water LF = 334,000 J/kg and LV = 2.256 × 106 J/kg
A) 1.50 × 104 kJ B) 4.10 × 106 kJ C) 0.00 kJ D) 1.02 × 105 kJ