A sample of 
has a mass of 50.0 grams. What is number of molecules of carbon dioxide in the 50.0 gram sample? (C = 12.0u, O = 16.0u)
A. 
B. 
C. 
D. 
E. 
E.
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Kirchhoff's voltage rule is an example of conservation of energy
Indicate whether the statement is true or false
An ice cube floating in a glass of water contains many air bubbles. When the ice melts, the water level will
A) rise. B) fall. C) remain unchanged.
When a positive charge q is placed in the field created by two other charges Q1 and Q2, each a distance r away from q, the acceleration of q is
a. in the direction of the charge Q1 or Q2 of smaller magnitude. b. in the direction of the charge Q1 or Q2 of greater magnitude. c. in the direction of the negative charge if Q1 and Q2 are of opposite sign. d. in the direction of the positive charge if Q1 and Q2 are of opposite sign. e. in a direction determined by the vector sum of the electric fields of Q1 and Q2.
A block of mass m sits at rest on a rough inclined ramp that makes an angle ? with the horizontal. What must be true about the force F that the ramp exerts on the block perpendicular to the surface of the ramp?
A) F > mg B) F > mg cos ? C) F > mg sin ? D) F = mg cos ? E) F = mg sin ?