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    Calculus: Four good word problems in calculus

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    #1 A tumor may be regarded as a population of multiplying cells. It is found empirically that the "Birth Rate" of the cells in the tumor decrease exponentially with time, so that B(t)=B0e^(-at)... find the limiting population of the tumor.
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    1. Population of cell multiplying exponentially with time is calculated.------------
    2. The resistance of water varies with square of velocity, the distance covered by it before coming to rest is calculated.--------
    3. Velocity and position for a body under drag as a function of time is calculated.---------
    4. A body is projected up and under the varying gravity the position and velocity are calculated.----------

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