Two point charges of + 5.00 ?C and + 8.00 ?C are placed inside a cube of edge length 0.100 m. The net electric flux due to these charges is given by
A) 0.340 × 106 Nm2/C
B) 0.450 × 106 Nm2/C
C) 1.47 × 106 Nm2/C
D) 3.80 × 106 Nm2/C
E) 4.20 × 106 Nm2/C
C
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A heat pump uses 100 J of work output heat at some temperature. If the heat pump withdraws 60 J of heat from some lower temperature, then what is the coefficient of performance for the heat pump?
A. 1.6 B. 2.0 C. 2.4 D. 2.8
Which of the following best describes what we mean by the term universe?
A) the sum total of all matter and energy B) a vast collection of stars that number as many as the grains of sand on all the beaches on Earth C) all the galaxies in all the superclusters D) our Milky Way Galaxy
Which model of the universe gives the youngest age for its present size and expansion rate?
A) a critical universe B) an accelerating universe C) a re-collapsing universe D) a coasting universe E) All models give the same age.
In the primary or inner rainbow, the
A. outer edge of the bow appears yellow and the inner edge appears green. B. outer edge of the bow appears red and the inner edge appears blue or violet. C. pot of gold is always at the left end. D. outer edge of the bow appears blue or violet and the inner edge appears red.