Mass and Motion A cat with a mass of 5 kg is sitting on a skateboard.
A rat with a mass of 0.5 kg is sitting on an identical
skateboard.
2. If you apply the same force to push each
skateboard, will the cat or the rat accelerate the
fastest? Explain.
Type your answer here.

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.