1. If the INternational space station has an orbital velocity of 9,000 m/s. find the time (in minutes) it takes to make one complete orbit. Relevant equations F = mv2/ R = m4[pi]2R / T2 The attempt at a solution Is this the way to solve for T? Do I use earth mass and Earth R b/c that all the question says? 2. A martian day is 1.03 earth days. At what altitude above Mars should a communications satelite be placed such that it always stay over the same spot above the surface of mars (answer in units of miles. 1000m = 0.62 miles Relevant equations F = ma = m4[pi]2R / T2 a= GM/R2 The attempt at a solution I know how to solve the problem but what kinda threw me off are the martian days given... Is T 354.36 days that is 365/1.03 If it is, can i find "a" after the "m" cancel, than solve for R which is (mar's radius + mars altitude) 3. find the lagrange Point between the sun and Jupiter. In between what two planets will you find this point? Jupiter: mass: 1.9x1027 kg Sun: mass: 1.99x1030 distance betwwen sun and Jupiter: 778x106 km Relevant equations Im really not sure what is lagrange point equation, is it... GMsunmjupiter/ r r is the distance of Jupiter- sun ?