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Can Someone Help w/ This Math?

Discussion in 'Off-Topic Discussion' started by SManZ, Nov 30, 2010.

  1. Nov 30, 2010 at 3:50 PM
    #1
    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    http://news.blogs.cnn.com/2010/11/30/report-co-pilot-moved-seat-sent-jetliner-plumetting/?hpt=C2

    So just to satisfy my curiosity, I wanted to know about how long this plane was plummeting for, but my math skills are pretty horrendous.

    Actually, its just figuring the triangular lengths that has me stumped.

    |---B--/
    |____/
    |A _/ C
    | _/
    | /
    |/

    The dive angle was 26 degrees and the drop (A) was 7000ft. I know you can figure out the length of the hypotenuse C with the angle and one length...just don't know how to do it.

    Length C by maybe 350kts (590fps) would be how long?

    I'm just curious because I'm kind of into flight sims and it seems to me like dropping 7000ft at just 28 degrees would take a while. At least long enough to remember that you pull the stick back to bring the nose up. I mean...just about everybody knows that. You'd think a copilot, even a poorly trained one, would know that.
     
  2. Nov 30, 2010 at 3:52 PM
    #2
    brettb

    brettb Well-Known Member

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    Pythagorem theorm. A^2 + B^2= C^2
     
  3. Nov 30, 2010 at 3:55 PM
    #3
    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Only one length is given; the altitude drop! You need two lengths to use the Pythagorean theorem. This is a side and an angle (between sides B and C). I think its one of those tests I failed where you have to use the Sin/Cos button on the calculator :p
     
  4. Nov 30, 2010 at 3:59 PM
    #4
    epa4wd

    epa4wd Well-Known Member

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    C = 15,968.2 ft
    im assuming the 26 degrees are between B & C

    otherwise
    C = 7788.2 ft
     
  5. Nov 30, 2010 at 4:02 PM
    #5
    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Nice...how'd you do it?

    350kts = 590fps
    400kts = 675fps

    So around 23 to 27 seconds??? Shit...the kid must have just totally froze up.
     
  6. Nov 30, 2010 at 4:03 PM
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    brettb

    brettb Well-Known Member

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    I thought you gave 2 lengths though?
     
  7. Nov 30, 2010 at 4:03 PM
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    jofixer

    jofixer Well-Known Member

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    A devided by the cosine of 26 degrees = C
     
  8. Nov 30, 2010 at 4:04 PM
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    epa4wd

    epa4wd Well-Known Member

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    edited the post, depending on where the 26 degrees are

    7000/cos(64) for 26 degrees between B & C

    or

    7000/cos(26) for 26 degrees between A & C
     
  9. Nov 30, 2010 at 4:05 PM
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    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Nope, the article gives a 7000ft vertical drop and a dive angle of 26 degrees.

    You might have confused the 350kts/590fps for a second length. It was a velocity I thought made sense to figure how long the plane was descending for.
     
  10. Nov 30, 2010 at 4:06 PM
    #10
    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Cool! Yep, dive angle is between B & C. I've been schooled! :bowdown:
     
  11. Nov 30, 2010 at 4:06 PM
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    graymaurer

    graymaurer Well-Known Member

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    Cos Θ = A/H

    H=A/Cos Θ

    where A=total height and Θ = angle from vertical (26°)

    Edit.....oops, too slow.
     
  12. Nov 30, 2010 at 4:07 PM
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    steve o 77

    steve o 77 braaap

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    soh cah toa :thumbsup:
     
  13. Nov 30, 2010 at 4:09 PM
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    113tac

    113tac Well-Known Member

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    x2 hahaha i will always remember that
     
  14. Nov 30, 2010 at 4:09 PM
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    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Wait...this is vaguely familiar...lol arrrgh dammit I told my teacher I would never use this stuff!
     
  15. Nov 30, 2010 at 4:10 PM
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    epa4wd

    epa4wd Well-Known Member

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    lol now if I could find someone that could help me with my electric machinery problems :eek:

    Tomorrow is going to suck, class from 730-330PM lab from 330-630PM, exam from 8-10PM, next day exam at 730AM

    FML
     
  16. Nov 30, 2010 at 4:13 PM
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    SManZ

    SManZ [OP] el tráfico más lento se queda derecha

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    Isn't the Maytag guy never doing anything? :p
    Good luck with it...math was never my strong suit.

    I looked up SOH CAH TOA...that was Trig. I definitely remember getting an F minus in Trig and pulling some magic to eke out with a D.
     
  17. Nov 30, 2010 at 4:15 PM
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    elblako91

    elblako91 Well-Known Member

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    Haha life safer on tests right there!
     
  18. Nov 30, 2010 at 4:16 PM
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    steve o 77

    steve o 77 braaap

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    me too lol

    I still use it in my statics class so its definitely worth memorizing if your going into any type of math or engineering field.
     
  19. Nov 30, 2010 at 4:21 PM
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    Caduceus

    Caduceus Well-Known Member

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    I don't use anything more complicated than a division symbol. Screw all the math after 7th grade (pre-algebra, algebra, geometry, Alg-2, Trig, Calculus and stats). what a waste of brain power and time.
     
  20. Nov 30, 2010 at 4:30 PM
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    EBBS03

    EBBS03 Well-Known Member

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    Wow, I learned something here that non of my teachers have ever taught me. So much easier that way, lol
     
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