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March 24, 2017

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Consider a hemispherical bowl of radius 10cm.

(4 points) If the water level in the bowl is h cm deep, find the radius of the surface of the water as a function of h.

(6 points) The water level drops at a rate of 0.1 cm per hour. At what rate is the radius of the water decreasing when the depth is 5 cm?

  • Calculus - ,

    draw a vertical cross-section of the bowl. Pick a point H on the vertical axis at height h from the bottom. If P is a point on the rim of the bowl, HP = 10. The radius at H is

    (10-h)^2 + r^2 = 10^2
    r = √(100-(10-h)^2)

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