Aweight of 720 n rests on a lever at a point 0.50 m from a support. on the same side of the support, at a distance of 3.0 m from it, an upward force with magnitude f is applied. neglect the weight of the board itself. if the system is in equilibrium, what is f?

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

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?

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.