maths

posted by URGENT

A spherical tank in a petro-chemical plant has a radius of 5m.
Give an expression which, when integrated from y=-r to
y=d-r ,will give the volume of liquid in the tank where r is
the radius and d is the depth of liquid.
If liquid is entering the tank at a rate of 1500 litres per second and
the depth is 3m how long will it take to fill the tank? Give your
answer in seconds.

  1. Steve

    The volume of a thin slice of water is the area of the slice times its thickness, dy

    At a depth of d, with d<r, we have
    the radius of the surface of the water is x = √(r^2-y^2)
    v = ∫[-r,d-r] π(r^2-y^2) dy

    Now you can answer the last part by subtracting the volume from the whole sphere's volume of 4/3 pi * 5^3 and dividing by 1500L/s = 1.5 m^3/s

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