An 90 kg satellite orbits a distant planet with a radius of 4000 km and a period of 280 min. From the radius and period, you calculate the satellite's acceleration to be 0.56 m/s^2. What is the gravitational force on the satellite?

I'm assuming that 4000 km is the radius of the orbit?

At that instant, the force on the satellite is given by F = ma.

This is your gravitational force.

The gravitational force is causing an acceleration of 0.56m/s^2. The satellite has a mass of 90 kg. All you need are those two pieces of information and Newton's second law (F=ma).

Sorry, Jerry. Once again I missed your answer because the stupid GO skin sometimes shows no answers, even though you had actually answered hours earlier.

It's okay, I know the frustration :)

And the owners still don't want to admit that Go is not as good as it appears.

Thank you so much!