An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
A. 1.2
B. 8.8
C. 6.5
D. 4.7
E. 7.5
Answer: B
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In the 19th century, Charles Darwin suggested that life may have originated
A) in shallow ponds on land B) deep beneath the oceans C) beneath the surface of the Earth D) in the atmosphere
The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents the most common type of stars?
A) b B) c C) d D) e
A force of 10 N acts on a charge of 5.0 ?C when it is placed in a uniform electric field. What is the magnitude of this electric field?
A) 50 MN/C B) 2.0 MN/C C) 1.0 MN/C D) 0.50 MN/C E) 1000 MN/C
Which system is the primary system of units
used in the United States today? a)The System International b)The British system c)The metric system d)The mks system