- #1

joel amos

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## Homework Statement

At what distance between two protons are the electrical and gravitational forces equal?

## Homework Equations

electromagnetic Force = k(Q1*Q2/r^2)

gravitational Force = G(m1*m2/r^2)

Constants:

k = 9.0*10^9 (N m^2/c^2)

G = 6.673 × 10^-11 (m^3 kg^-1 s^-2)

Charge of proton: 1.6*10^-19 C

Mass of proton: 1.67*10^-27 kg

## The Attempt at a Solution

I solved the first equation for r^2. Then, I substituted the second equation in for force since electromagnetic and gravitational force are equal in this problem. This seems logical, no? The only problem is, when I solve for r, the r's cancel out... :_(

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