A father is trying to teach his child to ice skate. As the child stands still, the father pushes him forward with an acceleration of 2.0 m/s2 north. If the child's mass is 20 kg what is the force with which the father is pushing

An observer that stands still as the electron moves by him, will observe

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

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.