A30 cm3 chunk of platinum weighs 6.3 n. it is carefully submerged in a tub of molasses. one cm3 of molasses weighs 0.013 n.
a. what is the weight of the molasses displaced by the platinum?
b. will the platinum sink or float in the molasses?

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.