You are working out on a rowing machine. each time you pull the rowing bar (which simulates the "oars") toward you, it moves a distance of 1.0 m in a time of 1.7 s. the readout on the display indicates that the average power you are producing is 82 w. what is the magnitude of the force that you exert on the handle?

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.