A 120.0 N picture hangs from a nail in the wall. The maximum shear stress the nail can sustain is 
The smallest diameter the nail can be is
A. 10.46 mm.
B. 12.36 mm.
C. 14.84 mm.
D. 16.67 mm.
E. 18.35 mm.
B. 12.36 mm.
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A 55-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.30. A 140-N force is applied to the box. What is the frictional force on the box?
What will be an ideal response?
Suppose you charge two transparencies by rubbing and then hold them near each other but not touching. Regarding the electric and magnetic forces they exert on each other,
A) they will exert neither electric nor magnetic forces because they are not in contact with each other. B) they will exert electric forces but not magnetic forces. C) they will exert neither electric nor magnetic forces because neither object is moving. D) they will exert both electric and magnetic forces. E) they will exert magnetic forces but not electric forces.
Silicates are minerals composed of silicon and oxygen.
Answer the following statement true (T) or false (F)
If a neutral metal object has been charged by friction to a charge of one pC, what has happened to it electrically?
a. 
electrons have been added to it
b. 
protons have been added to it
c. 
electrons have been removed from it
d. 
protons have been removed from it
e. 