A charged particle is injected into a uniform magnetic field such that its velocity vector is perpendicular to the magnetic field vector. Ignoring the particle's weight, the particle will
A) move in a straight line.
B) follow a spiral path.
C) follow a circular path.
D) move along a parabolic path.
E) immediately stop.
B
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Why does the Moon have a layer of "powdery soil" on its surface?
A) It is the result of countless tiny impacts by small particles striking the Moon. B) Recent, large impacts shattered lunar rock to make this soil. C) It is made by the same processes that make powdery sand on Earth. D) It exists because the Moon accreted from powdery material after a giant impact blasted the Earth.
How would you describe the distribution of galaxies in your Local Group?
A.) They just look randomly distributed. B.) There are the two big galaxies, and then the dwarfs seem to be clustered around them. C.) The big galaxies are together at the center and the dwarfs are in a big circle around them. D.) The dwarfs are in the center clustered together and the two big galaxies are off to the side. E.) The two larger galaxies are on one side of the group and all the dwarfs are on the other side.
An 80-eV electron impinges upon a potential barrier 100 eV high and 0.20 nm thick
What is the probability the electron will tunnel through the barrier? (1 eV = 1.60 × 10-19 J, mproton = 1.67 × 10-27 kg, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 0.011% B) 1.1% C) 0.11% D) 1.1 × 10-4 % E) 7.7 × 10-10 %
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
If two collinear vectors 
and 
are added, the resultant has a magnitude equal to 4.0. If is subtracted from , the resultant has a magnitude equal to 8.0. What is the magnitude of ?
A. 2.0
B. 3.0
C. 4.0
D. 5.0
E. 6.0