Search
Ask a question
0

Hard word problem

THe weight of a synthetic ball varies directly with the cube of its radius. A ball with a radius of 2 inches weights 0.80 pounds. Find the weight of a ball of the same material with a 3 inch radius.

1 Answer by Expert Tutors

Tutors, sign in to answer this question.
Tom F. | Math Tutor - I can help you achieve success in mathMath Tutor - I can help you achieve succ...
5.0 5.0 (54 lesson ratings) (54)
0
The cube of the first radius is
 
2= 8
 
The cube of the second radius is
 
33 = 27
 
Set up a propotion to solve for the missing weight
 
8/27 = .8/x
 
Cross muliply
 
8x = 21.6
 
x = 2.7