If a student can read her physics book only when she holds it no farther than 15 cm away, what focal length of lens should be prescribed so she can read when she holds the book 30 cm away?

Edward tolman explained the results of his study by theorizing that the rats were learning about the maze during every trial but they a. were agitated because other groups were getting reinforcement b. could not remember how to demonstrate it without reinforcement c. were not motivated to demonstrate it without reinforcement d. seemed to be too lazy to actually work without reinforcement

=force × distance a. work b. velocity c. pressure d. momentum

For which pair of objects would adding the same a