When U.S. annual energy use and gross national product (GNP) are graphed, the two graphs rise at the same rate until the mid-east oil shocks of the 1970s, after which
A) GNP keeps rising while energy use levels off due to global warming.
B) GNP keeps rising while energy use begins to level off due to increased energy efficiency.
C) energy use decreases due to declining fossil fuel supplies.
D) GNP levels off while energy use keeps rising due to technological stagnation.
E) total energy use increases without a similar increase in GNP, because of increased oil imports.
B
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A 5.00 kg mass is located at (2.00 m, 0.00 m, 3.00 m) and a 2.00 kg mass is located at (0.00 m, 4.00 m, –2.00 m). The center of gravity of the system of masses is
A. (10/7m, 8/7m, 11/7m). B. (11/7m, 7/7m, 8/7m). C. (7/7m, 10/7m, 11/7m). D. (10/7m, 7/7m, 8/7m). E. (8/7m, 7/7m, 10/7m).
The following formulas are supposed to describe the speed 
of a sphere sinking in a thick fluid. C is a unitless constant, 
is the fluid’s density in kg/m3, A is the sphere’s cross-sectional area, m is its mass, and is the gravitational field strength in N/kg. Which could be right?
A. 
= CA g
B. = Cmg/ A
C. = (Cmg/ A)2
D. = (Cmg/ A)1/2
E. None of these can be correct.
In what way does our theory of nuclear fusion predict that the Sun should be different today than it was when fusion began about 4-1/2 billion years ago?
A) The Sun's mass should be about 30% higher today. B) The Sun's mass should be about 30% lower today. C) The Sun's luminosity should be about 30% higher today. D) The Sun's radius should be about 30% higher today. E) The Sun's distance from Earth should be about 30% lower today.
The ________ star clusters are younger, and their stars richer in heavier elements released in supernova events
Fill in the blank(s) with correct word