Suppose you had a feather, an orange, and a watermelon. which of the following describes how quickly each of the objects will fall without air resistance, relative to the other two?
a. all three objects will fall at the same rate.
b. the watermelon will fall faster than the other two.
c. the orange will fall the fastest, followed by the watermelon and then the feather.
d. the feather will fall faster than the orange, which will fall faster than the watermelon.

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.