John walks 3\, \text m3m3, start text, m, end text east and 4\, \text m4m4, start text, m, end text north. What is the magnitude of his total displacement in \text mmstart text, m, end text?

Carbon 14 is a naturally occurring stable

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?

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.