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Magnitude of the gravitational force of attraction between the proton & electron

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ali13
#1
Nov3-10, 07:03 PM
P: 2
1. The problem statement, all variables and given/known data

A single proton and a single electron are fixed at a distance of 2.8 meters from each other. Find the magnitude of the electric force of attraction between them.

i have the answer to this, it is: 2.93*10^-29

but now it asks: Find the magnitude of the gravitational force of attraction between the proton and the electron. (Mass of a proton = 1.67 x 10-27 kg; Mass of an electron = 9.11 x 10-31 kg)

i'm not sure where to put gravity, 6.67 * 10^-11, in the equation:

F=k*Q*q/r2

thank you!
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tiny-tim
#2
Nov3-10, 07:35 PM
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hi ali13! welcome to pf!

(try using the X2 icon just above the Reply box )
Quote Quote by ali13 View Post
i'm not sure where to put gravity, 6.67 * 10^-11, in the equation:

F=k*Q*q/r2
F = GMm/r2


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