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Math Help - I can not get the answer from the book could you please explain

  1. #1
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    I can not get the answer from the book could you please explain

    Estimate the volume in metric units and compute the acual volume of the item:

    Oil in a barrel that has a height of 1 m and a diameter of 0.5m

    The answer in the book: 0.20mcubed
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  2. #2
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    Quote Originally Posted by camstill View Post
    Estimate the volume in metric units and compute the acual volume of the item:

    Oil in a barrel that has a height of 1 m and a diameter of 0.5m

    The answer in the book: 0.20mcubed
    The barrel is a cylinder I assume ....? With radius r = 0.25 m ....
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    So don't you use the formula V=(pi)(rsquared)(l)

    and I still don't get that answer
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  4. #4
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     V = \pi r^2h

     r = \frac {d}{2} = \frac{0.5\ m}{2} = 0.25\ m.

     \Rightarrow V = \pi \times (0.25)^2 \times 1

     \Rightarrow V = 0.20\ m^3 (correct to 2 sig. fig.)

    I hope that helps.

    ILoveMaths07.
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  5. #5
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    Quote Originally Posted by camstill View Post
    So don't you use the formula V=(pi)(rsquared)(l)

    and I still don't get that answer
    Then you're making a data entry error with your calculator.
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