Tell the difference between an internal and an external influence and give 1 examples of each.

Aproton is projected toward a fixed nucleus of charge +ze with velocity vo. initially the two particles are very far apart. when the proton is a distance r from the nucleus its velocity has decreased to 1/2vo. how far from the nucleus will the proton be when its velocity has dropped to 1/4vo?

Protons and neutrons are found within the nucleus of an atom

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant