Posted by Jack on .
The strength of a cable is proportional to the square of its diameter. If a 2cm cable will support 800kg, how much will a 3cm cable support?

Pre Calculus 
MathMate,
"The strength of a cable is proportional to the square of its diameter."
A 2cm cable has a diameter of 2 cm, and a 3cm cable has a diameter of 3 cm.
If a 2cm cable supports 800kg, so a 3cm cable supports:
800*(3/2)²
=?