Question

The density of bubble gum is about 915 kg/m3 . You blow a 7.00-gram wad of gum into a bubble with a measured diameter of 7.90 cm . Assume that all of the gum is in the skin of the bubble.

Part A

Part complete

What is the thickness of the bubble? Hint: Think about spreading the bubble into a flat sheet. The surface area of a sphere is 4πr2.

Give your answer in mm.

0.390

mm

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All attempts used; correct answer displayed

Part B

What had been the thickness of the bubble when the growing bubble was only 1/4 of its final diameter?

Give your answer in mm.

	mm m m

Answer 1

Here we use formula of volume of sphere with inner and outer radius.

i use all parts in SI units

Part A

Part B