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    Stupid Math ...

    Got a cylinder with no top.
    250 square cm's of fiberglass.

    r cm's would represent the base radius of this cylinder. What is the cubic function? What are the dimensions of the cylinder when it has 200mL in it? Not only what is it, how did you get it ... this could really come in handy later on for me.

    I was thinking along the lines of V=pir^2h ... C=2r ... = 2pir+pir^2 ... whaaaaat the ...

    What this has to do with boxes ... you shall see.

    Much appreciated.

    - Steve



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    Re: Stupid Math ...

    And if you don't know the height, or any dimensions ... where I'm confused.

    - Steve



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    Quote Originally Posted by DJGTSR
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    Re: Stupid Math ...

    I need to know the cubic function of a cylinder with no top made out of 250 cm^2 of fiberglass, or metal, whatever. First of all.

    - Steve



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    Quote Originally Posted by DJGTSR
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    Re: Stupid Math ...

    Quote Originally Posted by Jmac
    You don't know any dimensions, but you need a cylinder to handle 200 mL ?
    so screwed. steve if u get boggled up, i took geometry last year (passed wit a 91) but i'm sure u know what ur doing. :veryhappy




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    Re: Stupid Math ...

    Quote Originally Posted by jbl_marshall21
    so screwed. steve if u get boggled up, i took geometry last year (passed wit a 91) but i'm sure u know what ur doing. :veryhappy
    So this guy makes a can with 250cm^2 of metal, fiberglass, whatever ... with no top.
    So you let r cm's represent the base radius. What is the volume of the can as a cubic function of r ?

    Im really confused.

    - Steve



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    Quote Originally Posted by DJGTSR
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    Re: Stupid Math ...

    you want a function for the volume of the cylinder with a surface area of 250 cm^2... it's a **** good thing I understand Stevenglish...



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    Re: Stupid Math ...

    Quote Originally Posted by Wonderbread
    you want a function for the volume of the cylinder with a surface area of 250 cm^2... it's a **** good thing I understand Stevenglish...
    Yeah well thats as good as it gets

    - Steve



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    Quote Originally Posted by DJGTSR
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    Re: Stupid Math ...

    not sure if this is right...
    you never know, lol.

    V = (Pi*r^2)[(250-Pi*r^2)/p]

    Pi = Pi...
    r= radius
    p = perimeter



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    Quote Originally Posted by PT Teal
    I woke up one morning and found a cop at my door telling me he found my car on fire in the middle of the desert.
    Quote Originally Posted by cleanerupper View Post
    Some people have told me that the chrome reflects sunlight, therefore the amp doesn't get as hot as others. Is this true?

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    Re: Stupid Math ...

    Quote Originally Posted by ss3079
    So this guy makes a can with 250cm^2 of metal, fiberglass, whatever ... with no top.
    So you let r cm's represent the base radius. What is the volume of the can as a cubic function of r ?

    Im really confused.

    - Steve
    SA=250cm^2

    thats without a top. hmmm tricky let me think here. aah yes nah nevermind i can't remember the the surface area formula of a cylinder.

    its right on the tip of tounge. ****'t if u don't figure it out tonight i'll get it tomorrow. i'll see if my math teacher can get it cuz i don't remember the **** formula. wait is it circumference X height + the area on the bottom?




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    Re: Stupid Math ...

    Thanks much ... we'll see if it works.

    - Steve



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    Quote Originally Posted by DJGTSR
    I dont mean to be rude, but what is the highest level of education that you finished?

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    Re: Stupid Math ...

    Quote Originally Posted by Wonderbread
    not sure if this is right...
    you never know, lol.

    V = (Pi*r^2)[(250-Pi*r^2)/p]

    Pi = Pi...
    r= radius
    p = perimeter

    perimeter on a cylinder????????




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    Re: Stupid Math ...

    Who knows, I'm pretty confused right now ...

    A can with no top is made from 250cm^2 of fiberglass. 'r' cm's would rep. the base radius of the can. Need the volume of the can as a cubic function of 'r'.

    I've gotten things scribbled down here ...
    SA= 250cm^3 = Pi*r^2 + 2Pi*r*h
    V= h*Pi*r^2
    V= (Pi*r^2)[(250-Pi*r^2)/p)
    V= 250r - Pi*r^3 / 2

    Last one catches my eye. But why, and how ...

    - Steve



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    Quote Originally Posted by DJGTSR
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    Re: Stupid Math ...




    Surface Area of a Cylinder = 2 pi r^2 + s r h
    Surface Area = Areas of top and bottom +Area of the side

    Surface Area = 2(Area of top) + (perimeter of top)* height
    Surface Area = 2(pi r^2) + (2 pi r)* h

    250 = (pi*r^2) + [(2pi*r)*h]
    Isolate for ‘h’
    h = [(250-pi*r^2)/(2pi*r)]

    V=Pi*r*h
    V = pi*r * [(250-pi*r^2)/(2pi*r)]

    There… ass….



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    Quote Originally Posted by PT Teal
    I woke up one morning and found a cop at my door telling me he found my car on fire in the middle of the desert.
    Quote Originally Posted by cleanerupper View Post
    Some people have told me that the chrome reflects sunlight, therefore the amp doesn't get as hot as others. Is this true?

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    Re: Stupid Math ...

    Uhm...

    I'm going to go grab a soda and then come back to this one. I think I need some caffeine if I'm going to understand this.



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    Re: Stupid Math ...

    I took off the top in my calculations... hence me not multiplying by 2... ***.. :p there is a bottom to the cylinder.



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    Quote Originally Posted by PT Teal
    I woke up one morning and found a cop at my door telling me he found my car on fire in the middle of the desert.
    Quote Originally Posted by cleanerupper View Post
    Some people have told me that the chrome reflects sunlight, therefore the amp doesn't get as hot as others. Is this true?

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