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What is the name for addition or subtraction??

The rules of engagement (roe) working group is often used to (select all that apply.)

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?