Re: No free lunch

Spaceman wrote:
No free lunch.?.

A gallon of water weighs about 8.345 lbs
so 10 gallons weighs about 83.45 lbs
place a 100 lb mass that can float in a
container that it can fit in so it does not touch the sides
but is pretty close to them and deep enough to
allow the item to float when it can.

The question now is,
Will 83.45 lbs of water (10 gallons) lift a 100lb mass?
:)


First of all, 100lbs is not mass, it's force, but only on the earth's surface. As I recall, in the old British system, mass is in Stones. You sure you're not just trolling? Ask any high school graduate, in order for your 45kg mass to float, it must displace 45kg of water. So you don't have enough water to float your mass. The object will sink in any container it will fit into (density is at play). But the answer to you question is: yes, via leverage, any force (including your ~370 Newtons of water) can "lift" any mass. As always, the laws of physics still apply.
Force1*Distance1 = Force2*Distance2
http://en.wikipedia.org/wiki/Joules
Go ahead and mess with lbs/feet/stones/btu etc. But if you ever hope to understand the basics you'll have to start talking SI (even American scientist use metric dude).
http://en.wikipedia.org/wiki/SI
.

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