Over time, the star-gas-star cycle leads the gas in the Milky Way to
A) have a greater abundance of heavy elements.
B) have a lower abundance of heavy elements.
C) become denser and have a greater abundance of heavy elements.
D) become denser and hotter.
A) have a greater abundance of heavy elements.
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A 0.16 pF parallel-plate capacitor is charged to 10 V. Then the battery is disconnected from the capacitor. When 1.00 × 10^7 electrons are now placed on the negative plate of the capacitor, the voltage between the plates changes by
a. ?5.0 V. b. ?1.1 V. c. 0 V. d. +1.1 V. e. +5.0 V.
The amount of energy equivalent to one kilogram of mass at rest is
A) 9.0 × 1016 J. B) 3.0 × 108 J. C) 4.5 × 1016 J. D) 6.0 × 10-3 eV. E) 1.2 × 108 eV.
Which of the following compounds contains both ionic and covalent bonds?
a. CaSO4 b. CHCl3 c. HNO3 d. C12H22O11
If the Sun passes almost in front of the center of our Milky Way Galaxy, it does so
A) once a year. B) once a day. C) only in 2012, at the end of the Mayan calendar. D) once a month.