If you start with one gram of pure 14C [half-life 6000 years], the amount remaining after 36,000 years will be
A) 1/32 gram. B) 1/64 gram. C) 1/128 gram. D) 1/6 gram. E) None.
B
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The formation of a galactic central bulge is believed to ____
a. be a slow steady process lasting billions of years b. start after the formation of spiral arms c. be a violent process which adds mass to the central black hole d. begin when the central black hole has reached mature size e. continue throughout the galaxy's life body
A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
A) 45 mph B) 50 mph C) 52.5 mph D) 55 mph E) 60 mph
The half-life of a muon is 2.2 ?s. How fast is it moving relative to an observer who says its half-life is 4.4 ?s?
a. 0.87 c b. 0.75 c c. 0.97 c d. 0.72 c e. 0.50 c
Eighty-eight prominent groups of stars in the sky are called the ______________
Fill in the blank(s) with correct word