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**physics 40s scaling and proportions .....please help**

the physics of a wire supporting a sphere...

A wire of .2cm in diameter is just strong enough to support a steel sphere. What must the diameter of the wire be if the following changes are made to the sphere?

A. new sphere has 4x the original volume

B. new sphere has 4x the original diameter

for part A.

-determine the relationship between the volume and the strength

-determine the relationship between the strength and the linear dimension

-determine the actual diameter

for part B.

-determine the relationship between the diameter and the strength

-determine the actual linear dimension

any help would be very much appreciated. i'm not really sure how you would relate changes in the wire to changes in the sphere...

thanks, mp3guy