any ideas?
Engineering HW Help
- Thread starter montecarlo01ss
- Start date
any ideas?
well, i know what i wont be majoring in
haha its for aerospace engineering, not my major but its a introduction course to all the engineering majors so i have to do it
0.1 = e^(-deltaV / 4000)
0.1 = e^(-deltaV / 40,000)
Solve for delta V
0.1 = e^(-deltaV / 40,000)
Solve for delta V
Last edited:
Case 1, I got 9210.340 m/s.
Case 2, I got 92103.404 m/s.
Edit: First time I did it, I used Mfinal / Minitial = 0.9, but that doesn't make sense since the propellant is burned off leaving 10% of the initial mass left. But the delta V sounds really high, so take my solution with a grain of salt.
Case 2, I got 92103.404 m/s.
Edit: First time I did it, I used Mfinal / Minitial = 0.9, but that doesn't make sense since the propellant is burned off leaving 10% of the initial mass left. But the delta V sounds really high, so take my solution with a grain of salt.
Last edited:
If 90% of the initial mass is propellant, then M_f/M_i is 0.1, not 0.9.
Ditto, pretty basic stuff here.. You have to multiply by the natural log function (LN) on your calculator for both sides of the equation .9=e^(-delta v/U).
LN*.9 = LN*e^(-delta V/ U)
LN*e^(x/y) = (x/y)
Edit: as pointed out, .1 is the ratio to use, not .9
Last edited:
It depends on how you read the problem.
If M_f = 0.9*M_i then 0.9*M_i/M_i = 0.9, but if it means that 90% was used up, then bkaul is right with the 0.1 (or 10%). I would lean toward 0.1 after looking closer at it. Good luck.
If M_f = 0.9*M_i then 0.9*M_i/M_i = 0.9, but if it means that 90% was used up, then bkaul is right with the 0.1 (or 10%). I would lean toward 0.1 after looking closer at it. Good luck.
I was fixing it while you typed this. I did it real quick first then realized it didn't make sense
ya after looking at how to set it up it looks pretty simple. thanks guys!
Wow, you didn't know the answer to this? SAD....
Last edited:
For propulsion, that equation is what F=ma is to physics. I just had flashbacks ...thanks.
Last edited:
Yeah, that's correct...
Jesus, how the **** can you guys understand all this???
Because their aliens man, their ALIENS!
I'm trying to decide as to why I clicked on this thread...
As if I don't have enough of Engineering homework I have to do myself..
As if I don't have enough of Engineering homework I have to do myself..
LS1PUSSOUT
Banned
at least the problem doesnt need two or three pages worth of calculations to figure out
Users who are viewing this thread
