Paul works for a supermarket and is pushing a wooden box of supplies across the supermarket floor. If the coefficient of kinetic friction between the crate and the floor is 0.2 and the kinetic friction between the floor and the
crate is 18 newtons, what is the normal force acting on the crate?

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.