48 grams of oxygen at room temperature consists of how many moles?
A. 3.0
B. 1.5
C. 0.75
D. more than 3.0
E. less than 0.75
Answer: B
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Which of the following explains why navigators prior to a few hundred years ago found it much more difficult to determine longitude than latitude?
A) Determining longitude requires an accurate clock, but latitude does not. B) Determining longitude requires mathematical techniques that were not known at the time. C) Determining longitude requires much more precise measurements of angles in the sky than does latitude. D) Determining longitude requires accurate tables of the celestial coordinates of stars, while determining latitude does not.
Of the jovian planets, which generates the least internal heat?
A) Pluto B) Jupiter C) Neptune D) Saturn E) Uranus
You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45° b. 23.4° c. 39° d. 51° e. The answer depends on the day of the year.
Two pairs of sunspots appear similar, but if one photo was made in 1990, and the next photo was made in 2002, what difference would we note?
What will be an ideal response?