Early astronomers believed that Earth did not move because they saw no ____, the apparent motion of an object because of the motion of the observer
a. uniform circular motion
b. archeoastronomy
c. heliocentrism
d. eccentricity
e. parallax
e
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An electron is moving at 
m/s perpendicular to a uniform magnetic field. If the radius of the motion is 18 mm, what is the magnitude of the magnetic field?
A. 70 mT
B. 0.95 mT
C. 9.3 mT
D. 1.6 
T
E. 8.9 nT
A photon hitting an electron (mass m) at rest can create an electron–antielectron pair in addition to the original electron. Assume that the two electrons and the positron move away from the collision at rest with respect to each other afterward. What was the photon’s initial energy?
A. Zero B. m C. 2m D. 3m E. 4m
What is the name for the universe model that has earth at the center?
An amino acid is an organic molecule that contains both an amine group and a carboxyl group. At an acidic pH, which structure is most likely:
A) structure (a) B) structure (b) C) structure (c) D) All three structures are equally possible.