A stationary block has a charge of +6.0*1^-8C. A 0.80-kg cart with a charge of +4.0*106-8C is initially at rest and seperated from the block by 0.4m. The cart is released and moves along a frictionless surface to a distance of 1.0m from the block. Determine as many values of the physical quantities descibng the motion of the cart as you can

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.