1. May 18, 2016 #1

   James Ray

   

   • Member advised to type out equations and not to use images only of handwritten scratchwork

   1. The problem statement, all variables and given/known data
   
   
   2. Relevant equations
   
   3. The attempt at a solution
   
   

    

   James Ray, May 18, 2016
2. 
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3. May 18, 2016 #2

   James Ray

   

   The radius seems very small (a factor of 10 less than Earth's radius. But I can't see any mistake in the solution.

    

   James Ray, May 18, 2016
4. May 18, 2016 #3

   ehild

   

   Homework Helper

   Gold Member

   Your result is wrong. You should use the template and type in your work.

    

   ehild, May 18, 2016
5. May 18, 2016 #4

   James Ray

   

   I forgot to square the radius in the first calculation.

    

   James Ray, May 18, 2016
6. May 18, 2016 #5

   ehild

   

   Homework Helper

   Gold Member

   Read this https://www.physicsforums.com/threads/guidelines-for-students-and-helpers.686781/ before your next posts.

    

   ehild, May 18, 2016
7. May 18, 2016 #6

   James Ray

   

   Now I get 11200 km.

    

   James Ray, May 18, 2016
8. May 18, 2016 #7

   ehild

   

   Homework Helper

   Gold Member

   It is all right now, but how did you get it? I see quite a lot of unnecessary calculations on your sheet of paper. It would be very easy if you derived the formula for R2 symbolically.

    

   ehild, May 18, 2016

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