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The oldest artificial satellite still in orbit is Vanguard I, launched March 3, 1958. Its mass is 1.60 kg. Neglecting atmospheric drag, the satellite would still be in its initial orbit, with a minimum distance from the center of the Earth of 7.02 Mm and a speed at this perigee point of 8.23 km/s.

(a) For this orbit find the total energy of the satellite–Earth system.

(b) For this orbit find the magnitude of the angular momentum of the satellite.

(c) At apogee, find the satellite's speed and its distance from the center of the Earth. (c1) Distance from the center of the Earth

(d) Find the semimajor axis of its orbit (metres)

(e) Determine its period (minutes)

For A) I subtracted U by Ek and got an answer of -9.0788x10^19 J

For B) I got 9.244x10^-5 Kgm^2/s Are my answers correct so far? I only have one more try on the questions.