The most common form of gas in the disk of the Milky Way galaxy is
A) atomic hydrogen gas.
B) molecular hydrogen.
C) gas in hot bubbles.
D) gas in stellar winds.
A) atomic hydrogen gas.
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The thermionic emission current density from a hot filament is in the form of a rate equation, with the energy term equal to the _________.
Fill in the blank(s) with the appropriate word(s).
If an electromagnetic wave has its magnetic field oscillating in the vertical direction, the direction of oscillation of the electric field is
A) east-west. B) horizontal. C) vertical. D) north-south. E) circular.
Acceleration and velocity are
A) different names for the same idea. B) very different from each other. C) concepts developed by Aristotle. D) none of the above
A runner runs 10 m from the origin toward the WEST to point A. He then runs from point A 20 m more toward the WEST to point B. He then runs from point B 30 m more toward the WEST to point C. The runner's total displacement from the origin to point C is
A. 60 m toward the WEST. B. 50 m toward the WEST. C. 20 m toward the WEST. D. 10 m toward the WEST. E. 0 m.