how can f=g m1 m2÷r√
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The most important rule in Algebra is that whatever you to to one side of an equation, you must do to the other. Starting with:
F = Gm1m2/R2
If you want to solve for R, then R definitely can't stay in the denominator. So multiply both sides of the equation by R2 to get
FR2 = Gm1m2
Now you want R by itself on one side of the equation, so divide both sides of the equation by F.
R2 = Gm1m2/F
Now all that's left is to take the square root of both sides.
R = positive or negative √Gm1m2/F where everything up till F is under the square root sign.
If you are going to be plugging things in to this new equation, be careful! You don't want to break the rules of the original equation, which can happen when you multiply by a variable to get your solution. You absolutely cannot set R equal to zero. Why? Because in the original equation, setting R equal to zero would cause your denominator to equal zero, which isn't allowed
F = Gm1m2/R2
If you want to solve for R, then R definitely can't stay in the denominator. So multiply both sides of the equation by R2 to get
FR2 = Gm1m2
Now you want R by itself on one side of the equation, so divide both sides of the equation by F.
R2 = Gm1m2/F
Now all that's left is to take the square root of both sides.
R = positive or negative √Gm1m2/F where everything up till F is under the square root sign.
If you are going to be plugging things in to this new equation, be careful! You don't want to break the rules of the original equation, which can happen when you multiply by a variable to get your solution. You absolutely cannot set R equal to zero. Why? Because in the original equation, setting R equal to zero would cause your denominator to equal zero, which isn't allowed
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