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Physics help??

Discussion in 'Chit Chat' started by TeeBe, Oct 28, 2007.

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  1. TeeBe

    TeeBe
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    Alright, so I am over tired and pathetic. It is a first year University physics course, a lab, and generally really straightforward. Not a challenging course at all. But...Maybe I have been looking at this question for too long, but...ARG! I figured...Well, who else to ask for help? :kiss: Because I love you all...share my pain! :lol: But not in a bad way., Just wondering if anyone had any ideas...

    [​IMG]

    I have to derive equation 3 from equations 1 and 2. And my brain is melting. I am going to blame it on too many midterms ;P

    Sorry if I put this in the wrong place...

    Thanks if anyone has any ideas!
     
    #1 TeeBe, Oct 28, 2007
  2. Jerr

    Jerr
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    Um.... D all of the above?
     
    #2 Jerr, Oct 28, 2007
  3. TeeBe

    TeeBe
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    If I can't find an answer, I am SO putting that!! And a little cartoon elephant. Because I want to. If I am going to bomb it, may as well make the TA laugh, right?
     
    #3 TeeBe, Oct 28, 2007
  4. CrimsonThunder

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    V is equal to V less to the power of o minus g which is timed by t.

    I hate these equations..
     
    #4 CrimsonThunder, Oct 28, 2007
  5. Rette

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    well, we need to eliminate t from the equation, so manipulate equation one to read:
    t=(Vo-V)/g
    Substitue into equation 2...I somehow ended up with an extra V**2 somewhere, but I'm pretty certain that's how to approach it

    EDIT: Okay, got it. Substituting into equation 2,
    s=Vo[(Vo-V)/g] - (g/2)[(Vo-V)/g]**2
    expand and simplify (too much to type!)
    sg=Vo**2-VoVo1/2Vo**2-1/2V**2+VoV
    sg=1/2Vo**2-1/2V**2
    isolating V...
    1/2V**2=1/2Vo**2-sg
    V**2=Vo**2-2sg
    QED.
     
    #5 Rette, Oct 28, 2007
    Last edited: Oct 28, 2007
  6. TeeBe

    TeeBe
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    (*hug*) THANK YOU!!

    I love you!! Seriously!!! (And I am more awake today :stuck_out_tongue_closed_eyes: )

    :kiss:
     
    #6 TeeBe, Oct 29, 2007
  7. Jim1454

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    LOL! Now I've seen everything! What a great 'virtual' family we've got here!!!!!
     
    #7 Jim1454, Oct 29, 2007
  8. Louise

    Louise
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    Are you all following this or am I the only stupid one who hasn't understood a single word :eusa_doh: :confused:

    Hope it all works out for you!
     
    #8 Louise, Oct 29, 2007
  9. TeeBe

    TeeBe
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    :lol: This virtual family is my favourite! I even have "sibblings" I can beg for homework help! (*hug*)
     
    #9 TeeBe, Oct 29, 2007
  10. Jim1454

    Jim1454
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    Don't worry about it Louise. My mom could never help me with my physics homework either!
     
    #10 Jim1454, Oct 29, 2007
  11. panda

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    Youse guys is so smart!
     
    #11 panda, Oct 29, 2007
  12. lucifer32

    lucifer32
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    And i thought polynomials from A level maths were hard lol
     
    #12 lucifer32, Oct 29, 2007
  13. Paul_UK

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    I might have understood it with a struggle about 20+ years ago but it's been so long since I've done anything like that so it's all a blur now. I always really struggled with the maths when I was studying electronic engineering at college, which was the main reason why I stopped at an HNC and didn't go on for a degree.

    Unless you've studied maths, physics or some other science though, you would not encounter something like that (thankfully)!
     
    #13 Paul_UK, Oct 29, 2007
  14. Davo

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    I got really excited when I saw this, but then realised you've already been given the answer.

    I'm fourth year Physics student, and this stuff is like the alphabet for me
     
    #14 Davo, Oct 29, 2007
  15. simon

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    i got none of that.
     
    #15 simon, Oct 29, 2007
  16. EthanS

    EthanS Guest

    :eek: :eek: :eek: :eek: wat is it.....that
     
    #16 EthanS, Oct 29, 2007
  17. Jerr

    Jerr
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    Note to self... take physics and become best friends with Davo... not in that order.
     
    #17 Jerr, Oct 29, 2007
  18. TeeBe

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    Haha, I need to make a new friend :wink: (pokes Davo...)
    There is an easier way to do it too- Just square the first equation, and you can factor out the second. Just sub in "s" for that mess, and you are done! I feel silly, a couple years ago I could do this without thinking :grin:

    I am taking a first year physics class, because I have a boring course load (phisics is far more interesting than, say, Canadian Healthcare Reform...) and there weren't very many classes with open seats...
     
    #18 TeeBe, Oct 29, 2007
  19. Miaplacidus

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    I remember those... lol.
     
    #19 Miaplacidus, Oct 29, 2007
  20. CrimsonThunder

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    I helped didn't I? o_o
     
    #20 CrimsonThunder, Oct 29, 2007
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