Well, seeing as this is a great place to do so, I want to make sure I did this next problem correctly for self-assurance.
Quote:
Using the change (delta) in velocity that must be used to lower the perigee to a 60-mile altitude (This was your answer to the Shuttle math question for Lesson 1) and assuming the Orbiter's OMS engines have a combined force (thrust) of 12,000 lbs and the Shuttle has a weight of 250,000 lbs (with a full cargo bay), use the equations below to compute the length (or time) of the burn necessary in minutes.
f = ma force equals mass times acceleration and t = v/a time equals velocity divided by acceleration
Your acceleration will be in G's, where 1 G = 32 feet per second per second (this is how far an object travels due to the force of gravity in a vacuum).
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Above is the second math problem. Below is the work I did myself.
f/m=a <- New formula
12,000 lbs / 250,000 lbs =a
.048 G =a
.048 G * (32 fps/s) =a <- Converting away from Gs
(1.536 fps/s) =a
t=v/a
t=304 fps / (1.536 fps/s)
t=197.916667 seconds
t=197.916667 seconds / 60 seconds <- Converting into minutes
t=3.29861111 minutes
If someone could spare their time to just check over this and let me know if I thought the problem through correctly, it would be greatly appreciated.
Thanks very much,
Parker Francis