What evidence supports the hypothesis that a meteorite impact might have caused the extinction at the end of the
Mesozoic? What will be an ideal response?
An iridium anomaly at the Cretaceous-Paleogene boundary supports the extraterrestrial
impact, because iridium is rare in crustal rocks but found in higher concentrations in
meteorites. There is an impact crater in Chicxulub, Yucatan peninsula that includes shocked
quartz, wave deposits, and tektites.
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A 300-kg bear grasping a vertical tree slides down at constant velocity. The friction force between the tree and the bear is
A) 30 N. B) 300 N. C) 3000 N. D) more than 3000 N.
A labor-intensive industry is one in which wages and other compensation paid to employees constitute a very small percentage of expenses
Indicate whether the statement is true or false.
Suppose that the winds aloft in the Northern Hemisphere are geostrophic and blowing from the north. Low pressure is located to the ____
A) north B) south C) east D) west
The IUPAC name for one of the freons is 1,1,1-trichloro-2-fluoroethane. How many other constitutional isomers are there of this compound?
A) 1 B) 2 C) 3 D) 4