Asurveyor is measuring the distance across a small lake. he has set up his transit on one side of the lake 90 feet from a piling that is directly across from a pier on the other side of the lake. from his transit, the angle between the piling and the pier is 40°. what is the distance between the piling and the pier to the nearest foot?

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.