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mosque
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Homework Statement
What is the distance from the Earth's center to a point outside the Earth where the gravitational acceleration due to the Earth is 1/10 its value at the Earth's surface?
Homework Equations
FG= GmM/r^2
g= Gm/r^2
G=6.67x10^-11 (Nm^2)/kg^2
m(earth)=5.97x10^24 kg
g=9.8m/s^2
The Attempt at a Solution
g=1/10g (earth)
g= Gm/r^2
r^2= (Gm/g)1/10
r^2= (Gm/g)10
Answer: r=2.02x10^7 m^2
Using dimensional analysis I somehow got m^2, but I know the units should be in meters, not meters squared.
My other concern is where I change r^2= (Gm/g)1/10 to r^2= (Gm/g)10
I'm not even sure if it was correct to do that. By changing the multiplication from 1/10 to 10 was the only way I got the right answer. I could maybe post an attachment with a picture of my work if it would help you understand what I did.
Any help is greatly appreciated.