Which statement about electric force is true? a) it is a purely attractive force. b) it is a purely repulsive force. c) it is both an attractive and a repulsive force. d) it is neither an attractive nor a repulsive force.

Agardener uses a wheelbarrow to move soil from a truck to his garden. on the first trip from the truck to the garden, the wheelbarrow is half-full of soil and the gardener applies a certain force to cause it to accelerate. on the second trip, the wheelbarrow is full of soil. although the gardener applies the same amount of force to the wheelbarrow, he cannot move it with the same rate of acceleration. what should the gardener do to move the wheelbarrow at the same rate of acceleration for the second trip?

According to social exchange theory, altruistic behaviors benefit the individual who performs them. t/f

Aknife blade is a(n) a. lever b. screw c. wedge d. inclined plane