Aplane flies from base camp to lake a, a distance of 290 km at a direction of 20.0° north of east. after dropping off supplies, the plane flies to lake b, which is 170 km and 30.0° west of north from lake a. graphically determine the distance and direction from lake b to the base camp.

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.