Which of newton's laws of motion explains that an object can be accelerated by an unbalanced force?

newton's 1st law of motion
newton's 2nd law of motion
newton's 3rd law of motoin

Ihave a density of 1.61g/cm^3 and a mass of 28g. find the missing value

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.

Asimple electrochemical cell contains two electrodes? t or f