A charged particle moves with its velocity perpendicular to a magnetic field. The field acts to change the particle's
A) mass.
B) magnitude of momentum.
C) velocity.
D) energy.
E) charge.
C
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In pre-Copernican astronomy, it was almost universally believed that
a. the planets traveled in elliptical orbits about Earth. b. the center of the universe was the Sun with the Milky Way representing other distant planets. c. the Sun was at the center of the universe. d. Earth was at the center of the universe. e. None of the above was believed.
Observed temperature fluctuations in the Cosmic Microwave Background Radiation are
A) millions of kelvins. B) hundreds of kelvins. C) a few kelvins. D) tens of millionths of a kelvin. E) immeasurably small.
A karate chop is more effective if one's hand
A) follows through upon impact. B) bounces upon impact. C) extends the time upon impact.
A uniform cylinder of radius R, mass M, and length L rotates freely about a horizontal axis parallel and tangent to the cylinder, as shown below. The rotational inertia of the cylinder about this axis is
?
?
a.
.
b.