According to the parallelogram rule for vectors, the diagonal of the parallelogram represents
A. the vector sum of the forces.
B. the resultant of the vectors.
C. either component of the vectors.
D. all of the above
Answer: B
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Scientists have been able to evaluate changes in ocean temperature profiles over more than 100 years by comparing modern instrument float records to data obtained during the ________.
A. Glomar Explorer expedition B. Meteor expedition C. Beagle expedition D. HMS Challenger expedition
The Milankovitch Theory proposes that climatic changes are due to particles suspended in the
earth's atmosphere. a. true b. false
You have been hired by a rapidly growing small city to improve the air quality, which has deteriorated in the past 10 years. What would be a logical action to take?
A) move or close the cattle feed lots near the river B) improve transportation options, including carpool lanes, buses, and light rail C) remove the hydroelectric dam on the river D) try to negotiate with the large city downwind whose factories produce large amounts of pollution E) decrease the amount of CFCs used locally
In the 1970s and 1980s, CFCs were widely used in ________
A) refrigerators and aerosol cans B) light bulbs and electronics C) coal-fired power plants D) snowmobiles and motorcycles