A tube of mercury with resistivity 9.84 × 10-7 ? ? m has an electric field inside the column of mercury of magnitude 23 N/C that is directed along the length of the tube
How much current is flowing through this tube if its diameter is 1.0 mm?
A) 180 A B) 29 A C) 18 A D) 280 A
C
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A metal block has a mass of 5 grams and a volume of 1 cubic centimeter. A piece of the same kind of metal with a volume of 2 cubic centimeters has a density of
A) 2.5 g/cm3. B) 5 g/cm3. C) 10 g/cm3.
Mercury's evolution was different from the Moon's because:
A) Mercury developed a dense atmosphere while the Moon never did. B) Mercury was located farther from Earth, so experienced no tidal forces. C) Mercury was subject to more intense asteroid bombardment than the Moon. D) dense Mercury had an iron core that shrank, creating the lobate scarps. E) Mercury developed a strong magnetic field to protect it from solar radiation.
Jane has about $536 in her checking account, about $2107 in her savings account and exactly $7.62 in her purse. To the best precision possible, how much money does Jane have?
A) $2651 B) $2,650 C) $2,650.6 D) $2,650.62 E) $2,650.620
On the H-R diagram, the bright blue stars that dominate the naked-eye sky lie
A) at the top left. B) at the lower left. C) in the middle of the main sequence. D) at the top right. E) at the lower right.