A functional group is
a. exemplified by the R in ROH.
b. a vertical column in the periodic table.
c. exemplified by the COOH in RCOOH.
d. a horizontal row in the periodic table.
c
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Radio dishes are large in order to:
A) attract funding from NASA and the NSF. B) give greater magnification. C) increase their angular resolution and collect the very weak radio photons. D) increase the range of waves they can collect. E) detect shorter waves than optical telescopes for superior resolution.
Fusion reactions happen at a slower rate in bigger stars than in smaller ones.
a. true b. false
What is the significance of the Planck time?
A) It is the amount of time required for two protons to fuse to make deuterium. B) It is the time at which inflation is thought to have occurred. C) It is the time when the cosmic microwave background was released. D) Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred.
The frictional force of the floor on a large suitcase is least when the suitcase is
a. pushed by a force parallel to the floor. b. dragged by a force parallel to the floor. c. pulled by a force directed at an angle q above the floor. d. pushed by a force directed at an angle q into the floor. e. turned on its side and pushed by a force parallel to the floor.