The oldest known features of Mercury's surface formed:
A) about 4.6 billion years ago.
B) about 3.9-3.2 billion years ago.
C) just under 4 billion years ago.
D) less than a billion years ago.
C
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Uniform Circular Motion: A child sits on a merry-go-round, 1.5 meters from the center. The merry-go-round is turning at a constant rate, and the child is observed to have a radial acceleration of 2.3 m/s2. How long does it take for the merry-go-round to make one revolution?
Fill in the blank(s) with the appropriate word(s).
Which of the following best explains why we see horizontal "stripes" in images of Jupiter and Saturn?
A) The light stripes are regions of high clouds, and the dark stripes are regions where we can see down to deeper, darker clouds. B) The dark and light stripes correspond to alternating bands of different chemical composition. C) There are three different color stripes corresponding to the three different types of clouds found on these planets. D) Dark stripes are in places with strong winds and light stripes are in places with weak winds.
Which one of the following cannot be a definition of an elastic modulus?
A.
B.
C.
D.
E.
Which pair are actually the same compound?
a. (CH3)3 N and CH3CH2CH2NH2 b. CH3CH2CH(NH2)CH3 and CH3CH(NH2)CH2CH3 c. CH3CH(Cl)CH3 and CH3CH2CH(Cl)CH3 d. CH3(CH2)2CH3 and CH3CH2CH(CH3)2 e. CH3CH2CH2NH2 and CH3CH2CH2N2H2