Help with physics please

[DrNunes]

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So I have this one physics problem that is kicking my... you know what. I came up with some answers but am not too sure of them. What do you think?

A rectangular water tank is supported above the ground by four pillars 5.0 m long whose diameters are 20 cm. If the tank were made 10 times longer, wider, and deeper, what diameter pillars would be needed? How much more water would the tank hold?

This is what I worked out

Original Pillar
Height 5 m
Diameter 0.2 m
Tank vol. (X)^3

New Pillar
Height 5mx10=50m
Diameter 0.2mx10=2m
Tank vol (X x 10)^3=[(X^3)(1,000)]

I am unsure about the new pillars diameter

I know I already posted this on the pre-allo side but they kept telling me that I had the question wrong... it isn't

http://www.brookscole.com/physics_d...urces/003026961X_serway/optional/scaling.html

 

[Mbeas]

closed. right?

 

[DrMom]

closing.

Please do not use the forums for homework help or post the same thing in multiple forums.