The source of electrons that illuminate a common lamp in your home is
A) the power company.
B) the electrical outlet.
C) atoms in the lamp filament.
D) the wires leading to the lamp.
E) the source voltage.
Answer: C
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The gravitational field at the earth due to the moon is (the mass of the moon is 
kg and separated by a distance of 
A. 
B. 
C. 
D. 
E. 
A reading of a tire gauge tells you that the gauge pressure in a tire is 31 lb/in2 . What is the absolute pressure in the tire? Assume that atmospheric pressure is 14 lb/in2
a. 17 lb/in2 b. 59 lb/in2 c. 45 lb/in2 d. You can't be sure since you may have nitrogen-filled tires.
Element A, mass 5.00 g, reacts exactly with 2.00 g of element B to form 7.00 g of compound AB. If 10.00 g of element A are reacted with 2.00 g of element B to form the same compound, what mass of compound AB will be formed?
a. 7.00 g b. 5.00 g c. 17.00 g d. 12.00 g
A large, metallic, spherical shell has no net charge. It is supported on an insulating stand and has a small hole at the top. A small tack with charge Q is lowered on a silk thread through the hole into the interior of the shell. What is the charge on the outer surface of the shell?
1.Q 2.Q/2 3.0 4.-Q/2 5.-Q