Universal Gravitation

  • Thread starter IamatWork
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  • #1
IamatWork
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A 1500 kg satellite is orbiting planet earth. The period is 86400 seconds and the radius is 42200000 meters. To determine the magnitude of attractive force... you use equation F=GM(sat)M(Earth)/R2. I know that the mass of Earth is 6.0*10(exp)7 kg and the gravitational constant is 6.67*10(exp negative 11) N*m2/kg2. My answer comes out to be 3.37 *10(exp)32, which is not one of my options?
 

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  • #2
Nenad
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did you account for the radius of the Earth in your calculation. The distance you need to use is orbital height above erath + Earth's radius.

Regards,

Nenad
 
  • #3
tony873004
Science Advisor
Gold Member
1,753
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The mass of the Earth is not [tex]6*10^{7}kg[/tex]. It is [tex]6*10^{24}[/tex] kg.

and don't use r2, but rather [tex]r^2[/tex], but I think you knew that already or you probably would have put 2r instead
 
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