Universal Gravitation

[IamatWork]

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?

 

[Nenad]

did you account for the radius of the earth in your calculation. The distance you need to use is orbital height above erath + earths radius.

Regards,

Nenad

 

[tony873004]

The mass of the Earth is not $$6*10^{7}kg$$. It is $$6*10^{24}$$ kg.

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