The weight of a synthetic ball varies directly with the cube of its radius. A ball with a radius of 2 inches weighs 5.205.20 pounds. Find the weight of a ball of the same material with a 3-inch radius.

asked Oct 18, 2018 51.2k views

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W=kr^3
1.20=8k

=> k = .15
So, W = .15r^3
When r=3 inch, W = .15*27 = 4.05 pounds

i hope this helps

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