At sea level, the pressure of the atmosphere is about ________ kg/cm2, or ________ ln/in2
A) 1.0; 14.7
B) 2.6; 9.4
C) 8.2; 3.3
D) 6.7; 19.9
A
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The Milky Way galaxy is an example of a(n) ________ galaxy.
A. spiral B. irregular C. elliptical D. dwarf
The bookstore is a ten-minute walk from campus. This is an absolute measure of distance
Indicate whether the statement is true or false.
With today's technology, wind energy could only meet 30-40% of total electricity needs in the United States. All of the following are reasons why wind energy cannot meet a greater portion of our energy needs except:
A) Wind turbines are only 30-40% efficient at converting wind energy into electricity. B) We cannot efficiently move electricity across a large grid from windy areas to distant areas where there are no wind farms. C) Wind is an intermittent resource and may not be blowing when we need the electricity. D) We have no efficient way of storing excess amounts of electricity produced when it is windy.
The energy in the Sun's core is produced by
A. fusion of hydrogen to helium. B. radioactive decay. C. chemical reaction of hydrogen and helium. D. release of gravitational potential energy.