The "Milky Way" in the night sky looks like a blurry circle of light in the sky because
A) we are seeing the stars and gas that lie in disk of our Milky Way Galaxy.
B) our Sun is located at the center of our galaxy.
C) the stars within this band of light are much farther away than other stars.
D) our rotating Earth blurs our view of stars in the Milky Way Galaxy.
A) we are seeing the stars and gas that lie in disk of our Milky Way Galaxy.
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James moves in a circular path (radius 15.0 m) with a speed of 60.0 m/s. His ANGULAR VELOCITY is
A) 120/? rpm. B) 120 radians/s. C) 120. rev/s. D) 120? radians/s. E) 120/? radians/s.
The lines in the visible region of the hydrogen spectrum arise from transitions from higher levels back to the level where n equals
a. 3. b. 1. c. 2. d. 4.
The traditional "top-down" hypothesis states that the galaxy formed
a. from a large spherical cloud of gas that was rotating very slowly. b. from a large cloud of material that broke off a larger galaxy. c. from material that had been ejected in the violent explosion of a dying galaxy. d. as a result of mergers between several smaller groups of gas, dust, and stars. e. as two massive galaxies collided.
A bar magnet is dropped from above and falls through the loop of wire shown below. The north pole of the bar magnet points downward towards the page as it falls. Which statement is correct?
a.
The current in the loop always flows in a clockwise direction.
b.
The current in the loop always flows in a counterclockwise direction.
c.
The current in the loop flows first in a clockwise, then in a counterclockwise direction.
d.
The current in the loop flows first in a counterclockwise, then in a clockwise direction.
e.
No current flows in the loop because both ends of the magnet move through the loop.