Many of these problems can be googled to find the answer.
But here is what I am getting for some of these problems.
3) OVER 9000!!! according to google, it extends around 480 km, but that's not one of the answer choices, so eh.
4) Google says 27.3 days
5) power = (Force * Distance) / (Time)
In this case, force = weight = 225, distance = 15, and time = 5
6) C
7) D
8) D (I think... becasue the satelite has to push back with the same force to stay in orbit)
9) One of the basic equations of motion is \(V_f = at + V_I\), where VF = Final velocity, VI = Initial velocity, a = acceleation, and t = time.
Plugging in the values, we get 10 seconds, A.
Hope this helps,
Your partial physician *wink wink* 
