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Homework Help: Past paper question about rates

  1. Dec 3, 2009 #1
    1. The problem statement, all variables and given/known data
    Water is falling gently into a large tank at 0.2m^3s^-1 and leaves through a small hole in the bottom of the tank of area 0.05m^2. What is the water velocity as it leaves? How full is the tank in the steady state?

    2. Relevant equations
    Well if the rate of water entering is 0.2m^3s^-1 by dimensional analysis rate=velocity*area
    So the rate of water leaving the tank will be v*Area = v*0.05

    I'm not sure how to find the velocity of the water as it leaves the tank because surely these two rates will not be the same (except in the steady state??)
  2. jcsd
  3. Dec 3, 2009 #2


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    Staff Emeritus
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    You've almost got it.

    What is v * Area? or rather what are the units of v * A?
    Last edited: Dec 4, 2009
  4. Dec 3, 2009 #3
    sorry what do you mean
    how to do change velocity*area?
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