At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) zero.
B) upward.
C) toward the north.
D) toward the south.
E) downward.
D
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The crystals in matter are held together by
A) cohesive forces. B) amorphous forces. C) electrical bonding forces. D) excess neutrons.
The fluids that are considered in this text:
(A) Have relatively low viscosities (B) Must be subjected to a normal stress to have motion (C) Have molecules that move relatively slowly (D) Move when subjected to any shear stress
The best explanation for the activity at the center of the galaxy is a(n) ____
a. supercluster of O and B stars b. black hole with a mass several thousand times the Sun's c. giant atomic hydrogen cloud energized into a single, massive emission nebula d. black hole with a mass several million times the Sun's e. exotic object known as a "magnetar"
Newton's Second Law in 1 Dimension: A catcher stops a 0.15-kg ball traveling at 40 m/s in a distance of 20 cm. What is the magnitude of the average force that the ball exerts against his glove?
Fill in the blank(s) with the appropriate word(s).