The purpose of a voltage source is to provide an electrical
A) energy sink.
B) field.
C) pressure.
Answer: C
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A thin spherical shell of radius 20.0 cm has 5.0 ?C of charge uniformly distributed over its surface. What is the electric flux through an area of 1.00 m2 of a spherical surface concentric with the shell of charge but having a radius of 1.00 m?
a. 
b. 
c. 
d. 
e. 0
This famous photograph taken by the Voyager spacecraft shows
A) Earth as viewed from the outskirts of the solar system. B) a close-up of the rings of Neptune. C) the cloud of gas and dust in which our solar system was born. D) the Sun as viewed from the next-nearest star.
Spectral lines from Galaxy B are redshifted from their rest wavelengths twice as much as the spectral lines from Galaxy B. According to Hubble's law, what can you say about their approximate relative distances?
A) Galaxy A is twice as far as Galaxy B. B) Galaxy B is four times as far as Galaxy A. C) Galaxy B is twice as far as Galaxy A. D) Galaxy A is four times as far as Galaxy B. E) Not enough information to say; you need to know Hubble's constant to answer this question.
If the vectors 
and 
have magnitudes of 10 and 11, respectively, and the scalar product of these two vectors is ?100, what is the magnitude of the sum of these two vectors?
A. 6.6 B. 4.6 C. 8.3 D. 9.8 E. 7.6