Most of the mass of the Milky Way seems to exist in the form of
A) population II stars in the Halo.
B) dark matter out in the Halo.
C) population I stars in the disk.
D) hydrogen gas in the disk and spiral arms.
E) the black hole in the Galactic Center.
B
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When voltage is induced in a coil of wire, current is
A) also induced. B) not induced. C) cancelled.
A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 30.0 m/s every second to keep a 1000 kg helicopter aloft?
a. 120 kg c. 327 kg b. 245 kg d. 490 kg
Bar One has a Young's modulus that is bigger than that of Bar Two. This indicates Bar One:
a. is longer than Bar Two. b. has a greater cross-sectional area than Bar Two. c. has a greater elastic limit than Bar Two. d. is made of material that is different from Bar Two.
Saturation and condensation are more likely to occur in
A) warm air than in cool air. B) air with a low relative humidity. C) cool air than in warm air. D) an adiabatic air mass.