The diagrams below show smooth blocks of wood being pushed across the same surface. The mass of the blocks and amount of force applied are labeled in each diagram. In which diagram would the block of wood have the greatest acceleration?

Most short-period comets do not have randomly oriented orbits because

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.

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?