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 Topic: bubble gum
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 A spherical bubble gum bubble 2007-12-31 From Houston:Bazooka Joe is blowing a spherical bubble gum bubble. Let V be the volume in the bubble, R the inside of the bubble, and T the thickness of the bubble. V, T, and R are functions of time t. (a) Write a formula for V in terms of T and R. Hint: Draw a picture (b) Assume that the amount of bubble gum in the bubble is not changing. What is V'(t)? (c) After 5 minutes of blowing a bubble gum bubble, the bubble is 3ft in diameter and .01 feet thick. If the inside radius of the bubble is expanding at a rate of .5 feet per minute, how fast is the thickness changing? Hint: Remember that the volume of gum in the bubble does not change over time.Answered by Harley Weston.

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