3. a man lifts various loads with the same lever. the distance of the applied force from the fulcrum is 2.00 m and
the distance from the fulcrum to the load is 0.500 m. a graph of resistance force vs. effort force is shown.
what is the mechanical advantage of the lever? what is the ideal mechanical advantage of the lever? what is
the efficiency of the lever? show your work.

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.