posted by Alex .
On August 12, 2005 the Mars Reconnaissance Orbiter (MRO) was launched from Earth and reached Mars on March 10, 2006. The orbiter is in roughly circular orbit about 390 km above the martian surface. Mars has a radius of 3396 km and a mass of 0.642 x 1024 kg (6.42E23 kg).
b) What is the radius of the MRO orbit?
c) What is the linear speed (v) of the orbiter above Mars?
d) What is the period of the orbiter in hours?