A heavy rock and a light rock in free-fall have the same acceleration. The reason the heavy rock doesn't have a greater acceleration is that the
A) force due to gravity is the same on each.
B) air resistance is always zero in free fall.
C) inertia of both rocks is the same.
D) ratio of force to mass is the same.
E) none of the above
D
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Goals for an efficient economy from an ecological perspective include all of the following except
A. measuring productivity by the number of people meaningfully employed. B. maximizing growth. C. valuing biological and cultural diversity. D. measuring progress by the percent of industries releasing no nasty pollutants.
Which of the following species is not amphiprotic?
A) C2H3O2- B) HC3H2O4- C) HC4H4O4- D) None, all of them are amphiprotic.
Until about 125 years ago, each town or area went by "local time" determined by
shadows cast by the sun. Indicate whether the statement is true or false
A soil that is 20% sand, 60% silt, and 20% clay is classified as
A) silt loam. B) clay loam. C) sandy clay loam. D) sandy clay.