A 320 kg satellite experiences a gravitational force of 800 N. What is the radius of the satellite's orgit? (Earth's radius is 6,400 km)

Use the equation for gravitational force? This directly gives you the radius you need after some work:



Substitute in the values that you've got. You should be given the universal gravitational constant G and the mass of the Earth (or the density and use the radius of the Earth to get an estimated mass). Then, solve for r. :)

Be careful with the units though!

Thank you.