The atomic mass of an element is equal to the number of:
a. protons
b. protons plus neutrons
c. protons plus electrons
d. neutrons

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

For which pair of objects would adding the same a

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?