Agroup of 25 particles have the following speeds: two have speed 10m/s, seven have 15m/s, four have 20m/s, three have 25 m/s, six have 30 m/s, one has 35 m/s, and two have 40m/s. determine (a) the average speed, (b) the rms speed, and (c) the most probable speed.

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.