An unstable atomic nucleus has a mass of 17.010-27kg, and starts out at rest. when it decays, it the original nucleus disintegrates into three particles. one particle has a mass of 5.0010-27kg and velocity of 6.00106 jm/s, and a second particle has a mass of 8.4010-27kg and velocity of 4.00106 im/s. calculate (a) the velocity of the third particle and (b) the total increase in kinetic energy as a result of the decay. (note that this kinetic energy actually comes from the mass of the original nucleus, according to e = ∆mc2, but only a tiny amount of mass is turned into energy, so we don’t have to worry about it for this problem.)

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.