An inverted conical water tank with a height of 12 ft and a radius of 6 ft

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An inverted conical water tank with a height of 12 ft and a radius of 6 ft is drained through a hole in the vertex at a rate of 2 ft3/s (see figure). What is the rate of change of the water depth when the water depth is 3 ft? Use similar triangles.

6 ft 12 ft Outflow 2 ft³/s

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Calculus Early Transcendentals

ISBN: 978-0321947345

2nd edition

Authors: William L. Briggs, Lyle Cochran, Bernard Gillett

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