Absolute visual magnitude is calculated at a standard distance of ____
a. one light year
b. one parsec
c. 10 light years
d. 10 parsecs
e. 100 parsecs
d
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Which of the following is not a key line of evidence supporting the hypothesis that Mars once had abundant liquid water on its surface?
A) the canals of Mars mapped by Percival Lowell B) small, rounded pebbles found in places that look like dry riverbeds C) chemical analysis of minerals found in what appear to be ancient lakebeds D) the eroded rims of ancient craters
Which large jovian moon is thought to have been captured into its present orbit?
A) Callisto B) Titan C) Triton D) Io
A spaceship approaches the earth with a speed 0.50c. A passenger in the spaceship measures his heartbeat as 70 beats per minute. What is his heartbeat rate according to an observer that is at rest relative to the earth?
A) 69 beats per minute B) 73 beats per minute C) 65 beats per minute D) 61 beats per minute E) 80 beats per minute
Which pair of elements is least likely to form an ionic bond?
a. K and H b. Al and F c. N and Cl d. S and Sr