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    Confused on how to approach this question :/ Name:  ImageUploadedByStudent Room1464112511.745871.jpg
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    wth lol. just out of interest what exam board is that from?
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    (Original post by TSRforum)
    Confused on how to approach this question :/ Name:  ImageUploadedByStudent Room1464112511.745871.jpg
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    Posted from TSR Mobile
    Ok so what we need is a function to be integrated.

    Consider the equation, (x-r)^2 +y^2 =r^2 (perhaps sketch it)

    How might that help?
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    (Original post by zetamcfc)
    Ok so what we need is a function to be integrated.

    Consider the equation, (x-r)^2 +y^2 =r^2 (perhaps sketch it)

    How might that help?
    How would I sketch that? Also I can see it can be re-arranged to y^2=.... as whatever I am integrating needs to be squared and multiplied by pi though I still don't know what the limits should be.


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    (Original post by TSRforum)
    How would I sketch that? Also I can see it can be re-arranged to y^2=.... as whatever I am integrating needs to be squared and multiplied by pi though I still don't know what the limits should be.


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    At C4 you should be able to sketch a circle. You will be able to see what the limits are once you have sketched it. http://www.wolframalpha.com/ if you really can't sketch.
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    (Original post by zetamcfc)
    At C4 you should be able to sketch a circle. You will be able to see what the limits are once you have sketched it. http://www.wolframalpha.com/ if you really can't sketch.
    Here's the answer: Name:  ImageUploadedByStudent Room1464118924.721022.jpg
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    Don't really see how I can sketch that or even work out the limits from looking at it.


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    (Original post by TSRforum)
    Here's the answer: Name:  ImageUploadedByStudent Room1464118924.721022.jpg
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    Don't really see how I can sketch that or even work out the limits from looking at it.


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    You can see how the sketch relates to the question as if you rotate that curve with R at the bottom you see it is like the picture in the question, the limits would follow from that.
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    (Original post by zetamcfc)
    You can see how the sketch relates to the question as if you rotate that curve with R at the bottom you see it is like the picture in the question, the limits would follow from that.
    Do I look at the bowl from a birds eye perspective?


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    (Original post by TSRforum)
    Do I look at the bowl from a birds eye perspective?


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    No, from front on so you see a half circle with a shaded area.
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    (Original post by zetamcfc)
    No, from front on so you see a half circle with a shaded area.
    Then do I rotate it 90 degree clockwise so it fits the x and y axis chart?


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    (Original post by TSRforum)
    Then do I rotate it 90 degree clockwise so it fits the x and y axis chart?


    Posted from TSR Mobile
    The axes are arbitrary, you just need to be able to see how one corresponds with the other, Name:  volume..png
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    (Original post by zetamcfc)
    The axes are arbitrary, you just need to be able to see how one corresponds with the other, Name:  volume..png
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Size:  2.6 KB (ignore the top half of the circle.)
    Thanks. It's a bit hard to tell what length h covers in relation to r by looking at the pic in the question, this makes everything much clearer
 
 
 
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