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anonymous

  • 5 years ago

1) seventy percent of the Earth's surface is covered with water. find the approximate surface area of the earth that is water 2) find the volume of the earth radius is 3963mi

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  1. anonymous
    • 5 years ago
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    You can easily find formulas for surface area and volume of a sphere on Wikipedia. That should help you.

  2. anonymous
    • 5 years ago
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    i tried and it didnt help

  3. anonymous
    • 5 years ago
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    Assuming that Earth is spherical... What's the formula for volume then? Can you find and type it here?

  4. anonymous
    • 5 years ago
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    sphere = (4/3) pi r 3

  5. anonymous
    • 5 years ago
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    Right. \[4 \div 3 * \Pi * r^{3}\] What does 'r' in this formula stand for?

  6. anonymous
    • 5 years ago
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    radius=3963

  7. anonymous
    • 5 years ago
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    Can you do the math then? You have all the numbers! Just divide/multiply and you'll get the answer to (2).

  8. anonymous
    • 5 years ago
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    v=28012.86

  9. anonymous
    • 5 years ago
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    Too little. Don't forget that: \[r^{3} = r* r * r\]

  10. anonymous
    • 5 years ago
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    62 240 377 347

  11. anonymous
    • 5 years ago
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    2.60712493 × 1011

  12. anonymous
    • 5 years ago
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    v=2 635.8033

  13. anonymous
    • 5 years ago
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    The number I'm getting is roughly 260,704,193,914 cubic miles or \[2.60 x 10^{11}\] cubic miles.

  14. anonymous
    • 5 years ago
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    (cubic because you multiplied a number of miles by a number of miles by a number of miles :))

  15. anonymous
    • 5 years ago
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    Now off to the first question. You'll have to calculate the area in a similar fashion, then calculate the percentage of it that is water.

  16. anonymous
    • 5 years ago
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    approximately 197,359,487mi

  17. anonymous
    • 5 years ago
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    Square miles. The number is correct. Well done. :)

  18. anonymous
    • 5 years ago
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    thank you

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