Weighs 80 N. Its weight at a distance 2R from
the center of the Earth is:

atomic = no of protons.

mass number-atomic number = neutron number

a charge 3q is at the origin, and a charge −2q is on the positive x axis at x=a. part a where on the x-axis would you place a third charge so it would experience no net electric force? enter an expression for the exact answer, which will involve a square-root sign. (do not enter an approximate decimal answer.)

what type of charge does it have? negative

it doesn't. it was imagined up in the middle ages.