Re: No free lunch

Spaceman wrote:
nospamplease wrote:
Spaceman wrote:
nospamplease wrote:
Ask any high school
graduate, in order for your 45kg mass to float, it
must displace 45kg of water.
Ask them also why you are wrong.
Do you think that the entire mass is displaced when
it "floats"

Yes. 100% of the time, 100% of the mass of an
object must be displaced for it to float. If that
requires less than 100% of the volume of the
object, then it floats, otherwise it sinks
(density at play here).

Try a simple experiment for yourself.
A cubic foot that floats half way
only displaces 1/2 a cubic foot of water.
and the water will rise 1/2 a cubic foot ,
(the displacement) in the container.


Agreed. But did you also know that your object must have a mass of ~14kg and a density of 0.5.


No 100% water displacement is occuring
only 50% in such.

Dude, make up your mind, are you talking about mass or volume? The laws of physics require that 100% of the mass is being displaced. The percentage volume of the object being displaced is dependent on its density. You've indirectly said its density is 0.50 by saying it was displacing half its volume.


If I make it sink, 100% of the cubic foot
will make the water rise 100% of the cubic foot.
You really should try to check this out
in an actual experiment.
I have.
in gradeschool.

I don't need to try that experimentally. I already know it's true. You know the difference between mass & volume right?

.

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