. An asteroid orbits the Earth in an asymmetric elliptical orbit shown as the dotted line below. Draw a FBD for the asteroid and use it to explain why the asteroid's speed increases as it approaches its parent body (the Earth) and decreases as it moves away. Hint: The newest equation for gravity may also be helpful.

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.