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# Fractional change? watch

1. Hey all,
I need some help with this question

Two masses m1 and m2 are placed near each other in a Cavendish experiment, whose aimis to measure the gravitational constant G. The position of the first mass is given by x1, andthe position of the second mass is given by x2 on some scale. Calculate the fractional changein the force between the masses
δF/F due small changes in x1 and x2 given that:

F=(G*m1*m2)/(x1-x2)^2

So far I have differentiated it, and got:

dF/dx = (-2Gm1m2)/(x1-x2)^3

What do I do now?
2. looks good to me, hand it up?
3. (Original post by jlsmpV2)
looks good to me, hand it up?
Are you sure? I feel like the question is asking for more than just a derivation

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