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g= GMm/r^2 is the force of attraction due to two bodies. ie. (Satelitte and earth) the mass of the Satelitte(m) cancels out in the equations, leaving the mass of earth (M).

Force(centripetal)=Force(gravity) (mv^2)/r=(GMm)/r^2 because v=(2pi r)/T substituting v and re-arranging: r^3=(GMT^2)/(4pi^2) r^3=(6.67*10^-11*6*10^24*(24*60*60)^2) / (4pi^2) r=4.23*10^7m from earth surface= 4.23*10^7 - 6.37*10^6 =3.59*10^7m above earth's surface

my method of studying pys is very simple- do heaps of problems and also make some notes. remember that all physics questions are basically concepts (learnt in class) but hidden. always refer to the syllabus. <o:p></o:p>