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Thread: So who's good at math? ;]

  1. #1
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    Default So who's good at math? ;]

    I need help

    2. The energy, E, of an object moving horizontally is directly proportional to the speed, V, of the object. When the speed is 10 m/s the energy is 40000 Joules.
    Part A: Find an equation connecting E and V.
    Can anyone at least give me a hint please?

  2. #2

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    e 4,000 joules per v 1m/s
    omg hit thankyou sooo much for the sig!!!

  3. #3

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    Quote Originally Posted by SIGMA [1s1k] View Post
    e 4,000 joules per v 1m/s


    that is the right answer, and it took me barely 20 seconds to get to it

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    Quote Originally Posted by Darrenb209 View Post
    that is the right answer, and it took me barely 20 seconds to get to it
    I needed to find it in a direct proportion equation like this:

    x=ky

    k=constant btw :L

    I worked out what type of formula I just dunno what it is
    Last edited by RMH94; 09-30-2010 at 01:23 PM.

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    Wow, i just glazed over reading that post.... Ill duck lower so it can over over my head quicker next time !

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    Quote Originally Posted by RMH94 View Post
    Can anyone at least give me a hint please?
    Energy (kJ) = Speed (ms) x 4

    i.e k=4

    you can convert to SI, as i cba, and im not doing it all for you

  7. #7

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    2. The energy, E, of an object moving horizontally is directly proportional to the speed, V, of the object. When the speed is 10 m/s the energy is 40000 Joules.
    Part A: Find an equation connecting E and V.
    I know an equation that requires the knowing the distance travelled. I will assume the object moved at 10m/s for 10 seconds. thus it moves 100m.

    newtons x m = joules
    400newtons x 100m = 40,000 joules

    400 newtons of horizontal force moving 100m = 40,000 joules of energy
    40,000 joules / 10s = 4,000 watts of power output
    Last edited by Rota; 09-30-2010 at 04:44 PM.
    Quote Originally Posted by Lazzzzzzzzalicious! View Post
    i started to read this and agree with everything rota says. if people just listened to him the forums would be a better place.
    Quote Originally Posted by Dawnseeker View Post
    Rota is correct.

    I don't even understand the question.

  8. #8
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    I'm not very good at math but does that mean the equation is 400N x V = 4,000E?
    ^Sigpic courtesy of Thorn.
    Quote Originally Posted by Dennis Wholey
    Expecting the world to treat you fairly because you are good is like expecting the bull not to charge because you are a vegetarian.

  9. #9

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    Quote Originally Posted by Richie_B View Post
    I'm not very good at math but does that mean the equation is 400N x V = 4,000E?
    Almost, the equation is...
    N x D = E

    N = newtons
    D = distance in meters
    E = joules


    edit: I found a velocity equation

    v^2 = 2E / mass
    so...
    10 m/s squared = 2(40,000 joules) / 800 kilograms
    Last edited by Rota; 09-30-2010 at 05:16 PM.
    Quote Originally Posted by Lazzzzzzzzalicious! View Post
    i started to read this and agree with everything rota says. if people just listened to him the forums would be a better place.
    Quote Originally Posted by Dawnseeker View Post
    Rota is correct.

    I don't even understand the question.

  10. #10

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    Rota is correct.

    Just kidding. I don't even understand the question.
    Legendary Hero

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