Well, what is the definition of "g"?
It is true that "g" has units of force per mass, but that is not what I asked you about.
What is the standard meaning of "g"?
Hint: It has a name all by itself..
No, it is called the "acceleration due to gravity".
Have you heard that expression before?
You never said what "g" was, only A!
In your problem, it should be interpreted as the acceleration at the Earth's surface.
So, letting M be the Earth's mass, we have that g=M/R^2
Is that enough of a hint?
I forgot it..
It should be g=GM/R^2
I think the ingredient's you need are f=GmM/r/r Newtons law of gravity and f=ma then you prove the rest simply by definition of small g=a at r=R. You do a few substitutions and you are there. You are probably having problems with the formalism of the process?
This has gone on for 6 responses now and I still wonder: What are you asking about Newton's law of gravity???
Separate names with a comma.