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nasryn Group Title

Oil spilled from a ruptured tanker is spreading in a circular pattern. If the radius of the circle is increasing at the constant rate of 1.5 feet per second, how fast is the area of the spill increasing when the radius of the spill is 42 feet?

  • one year ago
  • one year ago

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  1. goformit100 Group Title
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    use speed time formula...

    • one year ago
  2. nasryn Group Title
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    I've never heard of that.

    • one year ago
  3. satellite73 Group Title
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    related rates right?

    • one year ago
  4. nasryn Group Title
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    Yeah, related rates.

    • one year ago
  5. satellite73 Group Title
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    \(A=\pi r^2\) and so \(A'=2\pi rr'\)

    • one year ago
  6. satellite73 Group Title
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    you are told \(r'=1.5\) and \(r=42\) plug in the numbers and get \(A'\) in one step

    • one year ago
  7. nasryn Group Title
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    wow, that was easy. I'm terrible at these.

    • one year ago
  8. goformit100 Group Title
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    @bloodrain

    • one year ago
  9. satellite73 Group Title
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    yeah, i have to admit that one was real easy they get harder

    • one year ago
  10. nasryn Group Title
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    :(

    • one year ago
  11. satellite73 Group Title
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    well only the formulas get harder to figure out, i am willing to bet that you knew the formula for the area of a circle

    • one year ago
  12. nasryn Group Title
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    yeah, I was just thinking like A=pi(r^t/1.5)^2 then I was super confused

    • one year ago
  13. nasryn Group Title
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    That made absolutely no sense to me.

    • one year ago
  14. Dido525 Group Title
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    The minute hand on a watch is 8mm long and the hour hand is 4 mm long. How fast is the distance between the tips of the hands changing at one o'clock? THat's the hardest one I have done myself.

    • one year ago
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