Abaseball player throws a ball into the stands at 15.0 m/s and at an angle 45.0° above the horizontal. on its way down, the ball is caught by a spectator 4.10 m above the point where the ball was thrown. how much time did it take for the ball to reach the fan in the stands?

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.