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soty2013

  • 3 years ago

The volume of a cube is increasing at a rate of 9 cubic centimetres per second. How fast is the surface area increasing when the length of an edge is 10 centimetres ?

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  1. soty2013
    • 3 years ago
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    @bob-bob-bob

  2. Yahoo!
    • 3 years ago
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    V (cube) = a^3 d v / dt = 3 a^2 d a/ dt

  3. Yahoo!
    • 3 years ago
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    9 = 3 a^2 d a /dt 3/ a^2 = d a/ dt S = 6 a^2 d s/ dt = 6 * 2 a da / dt

  4. Yahoo!
    • 3 years ago
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    a = 10.... just sunstistute and find the answer

  5. soty2013
    • 3 years ago
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    Thanks :) @Yahoo!

  6. Yahoo!
    • 3 years ago
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    Welcome..:)

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