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**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 = mv

^{2}/ R = m4[pi]

^{2}R / T

^{2}

**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]

^{2}R / T

^{2}

a= GM/R

^{2}

**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: 1.9x10

^{27}kg

Sun:

mass: 1.99x10

^{30}

distance betwwen sun and Jupiter: 778x10

^{6}km

**Relevant equations**

Im really not sure what is lagrange point equation, is it... GM

_{sun}m

_{jupiter}/ r

r is the distance of Jupiter- sun ?