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B Formula for rate of change of liquid in frustum

  1. Feb 18, 2017 #1
    The question is as follows:

    Using all your Calculus knowledge, develop and justify, a formula for the rate of change of the heigh of a liquid in the cup, give:
    - The machine pours the liquid at a constant rate - ie. flow rate is constant
    - The shape of the cup is a "frustum", as given in the diagram
    - No liquid is spilt during pouring

    No values are given.

    top radius = b
    bottom radius = a
    liquid radius = r

    liquid height = h
    frustum height = H
  2. jcsd
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