• Support PF! Buy your school textbooks, materials and every day products Here!

Gravity and height

  • Thread starter NIZBIT
  • Start date
69
0
I have a problem like the one below:

https://www.physicsforums.com/showthread.php?t=114812

I understand how they derived it(I did the same thing) but never say what is the height. So could someone tell what the height is?
 

Answers and Replies

Chi Meson
Science Advisor
Homework Helper
1,766
10
In that problem, height is relative to the radius of the planet. The correct answer for THAT question should have been
[tex]r = \sqrt{2}*R[/tex].
That would be the orbital radius. The "height" would be the altitude above the planet, which would be
[tex](\sqrt{2}*R)-R[/tex]
or[tex](\sqrt{2}-1)*R[/tex]
Which happens to be equal to 0.41*R

Substitute the radius of the planet in for R and you get the "height."
 
69
0
Ok I see now. Wasn't so obvious last night.
 

Related Threads for: Gravity and height

  • Last Post
Replies
16
Views
2K
Replies
2
Views
781
  • Last Post
Replies
8
Views
8K
  • Last Post
Replies
1
Views
4K
Replies
3
Views
5K
  • Last Post
Replies
3
Views
9K
  • Last Post
Replies
1
Views
6K
Replies
5
Views
3K
Top