Two charged objects exert a force on each other. Then one of the charges is doubled while the distance between the charges is tripled. By what factor did the force change?

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects