Parallel Wires: Two long, parallel wires carry currents of different magnitudes. If the amount of current in one of the wires is doubled, what happens to the magnitude of the force that each wire exerts on the other?
A. It is increased by a factor of 8.
B. It is increased by a factor of 4.
C. It is increased by a factor of 3.
D. It is increased by a factor of 2.
E. It is increased by a factor of 
.
Answer: D
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An auto manufacturer advertises that their car can go "from zero to sixty in eight seconds." This is a description of what characteristic of the car's motion?
A) average speed B) instantaneous speed C) average acceleration D) instantaneous acceleration E) displacement
How is radioactive dating used to determine the age of an object?
a. Both the amounts of radioactive and decay material are measured. Using these with the radioactive material's half-life, the age can be estimated. b. The amount of radioactive material is measured. Using this with the radioactive material's half-life, the age can be estimated. c. The amount of decay material is measured. Using this with the radioactive material's half-life, the age can be estimated. d. The amount of heat generated by radioactive dating is measured to determine age.
When a typical open cluster forms, which type of stars are formed most often?
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In order to cool a cup of hot tea, someone adds some cold milk and then waits 5 minutes. Would the tea have been cooler at the end of the 5-minute period if the person first waited 5 minutes and then added the cold milk? Assume that the temperature of the milk is the same whenever it is to be added
1.No, the tea would be cooler after 5 minutes if the cold milk were added as soon as possible. 2.Yes, the tea would be cooler after 5 minutes if the cold milk were added at the end of the 5-minute period. 3.The final temperature of the tea would be the same in either case. 4.The one that would be cooler depends on the actual temperatures and amounts of the tea and the milk.