Fraunhofer lines are apparent in
A) absorption spectra.
B) emission spectra.
C) Doppler shifts.
D) a variety of energy levels.
E) none of the above
Answer: A
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In the giant impact theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
Buoyancy: A 10-kg piece of aluminum sits at the bottom of a lake, right next to a 10-kg piece of lead, which is much denser than aluminum. Which one has the greater buoyant force on it?
A. the aluminum B. the lead C. Both have the same buoyant force. D. It cannot be determined without knowing their volumes.
Refer to the figure above showing the abundance of elements in the galaxy relative to hydrogen. What is the general trend in elemental abundance?
A) Elements with more protons are less abundant. B) Elements with more protons are more abundant. C) Elements heavier than iron do not exist. D) Elements heavier than iron are relatively abundant. E) There is no apparent trend in the abundance of elements.
Oil separates a 20-mm-diameter rotating shaft from its 20.5-mm-diameter bearing. The bearing is 80 cm long and the shaft rotates at 2000 rpm. The velocity gradient at the bearing surface is nearest:
surface is nearest: (A) 6840 m/s/m (B) 7260 m/s/m s (C) 8040 m/s/m (D) 9406 m/s/m