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# Circular motion question. !!! watch

1. I keep getting this question wrong and I have been at it for two days

The gravitational force on a satelite of mass m at a distance r from the centre of the Earth is 4.0 x10^14 (m/r^2) . Assuming that the Earth is a sphere of radius 6.4x10^3 km, find the period of revolution ( in hours) of a satelite moving in a circular orbit at a height of 3.6x10^4 km above the Earths surface.

answer is 24.1 hours any ideas on the calculation ?? much appreciated.
2. (Original post by coco739)
I keep getting this question wrong and I have been at it for two days

The gravitational force on a satelite of mass m at a distance r from the centre of the Earth is 4.0 x10^14 (m/r^2) . Assuming that the Earth is a sphere of radius 6.4x10^3 km, find the period of revolution ( in hours) of a satelite moving in a circular orbit at a height of 3.6x10^4 km above the Earths surface.

answer is 24.1 hours any ideas on the calculation ?? much appreciated.

3. (Original post by coco739)
I know w^2r is acceleration and m is the mass but what is the extra w ?
typo
4. (Original post by coco739)
I know w^2r is acceleration and m is the mass but what is the extra w ?
Sorry typo

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