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Mass Flow Rate Question

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  1. Aug 3, 2015 #1
    1. The problem statement, all variables and given/known data
    A patient, on an anesthetic, is hooked up with only 18 mg of the anesthetic remaining. If the current flow is 12 mg/h and the dentist needs to increase the flow to 20.0 mg/h within two minutes, then how long will it take for the anesthetic to run out?

    2. Relevant equations

    mfr = Mass flow rate
    mfr = ∆m/∆t

    amfr = Acceleration Mass flow rate
    amfr = ∆mfr/∆t



    3. The attempt at a solution

     
    Last edited: Aug 3, 2015
  2. jcsd
  3. Aug 3, 2015 #2
    My opinions for reference:
    You should pay attention to the ##20\text{mg}/\text{h}## increase and how it increases. Then can see the consumption during these two minutes.
     
  4. Aug 4, 2015 #3

    billy_joule

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    Is that exactly as stated in the book? It's a little ambiguous...
    I'd guess it's attempting to say:

    A patient, on an anesthetic, is hooked up with only 18 mg of the anesthetic remaining. the initial flow is 12 mg/h, the dentist gradually increases the flow to 20.0 mg/h over a period of two minutes, then how long will it take for the anesthetic to run out?
     
  5. Aug 4, 2015 #4

    haruspex

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    Possibly, but to me it sounds more that after two minutes the flow will increase in one step to 20mg/h. Your interpretation has the merit of making the question more interesting.
    Is it only the interpretation that's stopping you? If there's more help needed, you must post an attempt.
     
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