There are 2 inflatable rubber tubes to be used in truck tyres. They are made from an identical kind of rubber sheet, of the same THICKNESS. The small one weighs 1kg when empty and 2kg when full of air after being pumped with air to internal air density P. The big tyre is the exact same design as teh small one, with all linear dimensions TRIPLED (except the thickness of the rubber). Since the rubber is very tough, the tubes do not change in size when they are inflated, they merely become round and taught rather than being a loose crumpled shell as when empty.a) What does the big one weigh when empty?b)What does the big one weigh when pumped to internal air density P?
I just read an article in my Boating mag that said stainless only resists rust when its' surface is exposed to oxygen. So even stainless steel cleats on a boat can rust where they are covered by washers, bolt heads and nuts. I doubt you will live long enough for the galvanized pipes to rust through. And my guess is that the stainless are thinner and may not even last as long as the galvanized. If thinner, they may also be more vulnerable to damage from activity on the surface, like a truck on the lawn to trim trees for instance. When in doubt, I say go with conventional materials that have worked reliably for a long time.
When I was little I set the school fire alarm off. LIke really little. Kindergarten or 1st grade. You know its that whole your not suppose to touch something so you just have to touch it. shhh don't tell anyone. I never got caught.
