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  1. #1
    The Usual Member Ice's Avatar
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    Default Re: Calculus Homework

    ok i got an answer of -.1 ohms/sec. It's saying my units are wrong though. The example in my textbook has ohms/sec though. Is there another name for ohms/sec?



  2. #2
    Jillian & Allison's Daddy Senior Member Don Corleone's Avatar
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    Default Re: Calculus Homework

    It's asking for the rate of change of current, not the resistance. Current is in amperes or milliamperes, so the units would be A/sec or mA/sec.
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  3. #3
    The Usual Member Ice's Avatar
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    Default Re: Calculus Homework

    Don... 2 minutes after it was due.

    Thanks for the help though, it was Amp/s.



  4. #4

    Default Re: Calculus Homework

    I believe the correct answer is: Gah!

  5. #5
    Backordered Member CrossLOPER's Avatar
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    Default Re: Calculus Homework

    The Org does not like doing your homework for you.
    Requesting suggestions for new sig.

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  6. #6

    Default Re: Calculus Homework

    Uh.... .25 amperes per second. I would have answered before the due date, but, you know...video games. Anyway, this is university homework?

  7. #7
    Jillian & Allison's Daddy Senior Member Don Corleone's Avatar
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    Default Re: Calculus Homework

    Quote Originally Posted by GoreBag
    Uh.... .25 amperes per second. I would have answered before the due date, but, you know...video games. Anyway, this is university homework?
    See, now helping him with the units is help. Giving him the answer... well.... more than I was willing to do.

    Just so you understand Ice, the one constant in the equation is the voltage.

    V=IR. If you take the derivative of both sides, dv/dt = R dI/dt + I dr/dt (using the chain rule). Now, you since voltage is constant, dv/dt = 0. Solving the rest is just algebra and plugging in the answers they gave you. If the initial resistance was 5 ohms, the initial current was 1A. Solving the above equation does indeed yield that dI/dt = -I/R dR/dt = -(1/5)*0.5 = -0.1 Amps/sec or 100mA/sec.

    Are you an EE Ice, or is that just an example equation from your calculus book to 'keep it relevant'?
    "A man who doesn't spend time with his family can never be a real man."
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  8. #8
    Senior Member Senior Member naut's Avatar
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    Default Re: Calculus Homework

    Quote Originally Posted by GoreBag
    Anyway, this is university homework?
    Quote Originally Posted by Ice
    Yeah it's university homework. I'm retaking Calc I, even though I could have gone to calc II. I just needed a Calculus course for my major and I didn't want to take Calc II.
    We get harder stuff at my high school. Should have gone to America .
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  9. #9
    Liar and Trickster Senior Member Andres's Avatar
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    Default Re: Calculus Homework

    Quote Originally Posted by CrossLOPER
    The Org does not like doing your homework for you.
    Unless you are willing to pay that is
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  10. #10
    Standing Up For Rationality Senior Member Ronin's Avatar
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    Post Re: Calculus Homework

    stop being a wuss and asking people on this board to do your homework for you!
    just man up and say your dog ate it like we all did it!
    "If given the choice to be the shepherd or the sheep... be the wolf"
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