Coulomb's Law: Two equal and opposite charges are a small distance apart, forming an electric dipole. A positive charge +q is placed above these charges, as shown in the figure, equidistant from both of them. Which diagram below best gives the direction of the net force the dipole exerts on the charge +q?
A. 
B. 
C. 
D. 
Answer: C
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The 1 560 kg solid steel door to a bank vault is 2.00 m high, 1.00 m wide and 10 cm thick. One hinge is 60.0 cm down from the top on the left hand side of the door. The other hinge is 30.0 cm up from the bottom. What horizontal force, in what direction, does the door exert on the lower hinge?
a. 6 950 N, left b. 6 950 N, right c. 7 640 N, left d. 7 640 N, right e. 15 300 N, left
The mass of 6 million atoms of a diatomic gas is 
What is the atomic mass of this gas?
A. 25.5 u B. 51.0 u C. 2.55 u D. 5.10 u
An apple weighing 3 newtons hangs, motionless, from a tree branch. The net force on the apple is
A) impossible to determine from the information that is given. B) 3 newtons upward. C) 6 newtons downward. D) 3 newtons downward. E) None of the above.
Which of the following material types absorb all wavelengths of photons?
(a) Metals (b) Semiconductors (c) Dielectrics (d) Free atoms