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TESS is a satellite of mass 
in a circular orbit about the Earth as shown in
The radius of the Earth is 
and the mass of the Earth, considered to be a point mass at its centre, is 
.
It takes TESS 13.7 days to orbit the Earth. Show that the radius of orbit of TESS is 
.
Calculate the change in gravitational potential energy between TESS in orbit and TESS on a launch pad on the surface of the Earth.
.
