Charlie Bell wrote:
>
>> Well, it's not _free fall_, because the resistance of the air
>> slows him down.
>
>Still free fall. If you're falling without an aid designed to arrest that
>fall, it's free fall. Falling at terminal velocity in air is still free
>fall.
>
I thought free fall was a fall that could be computed by just
gravitational forces...
>Free fall in orbit is only different because you're missing the
>ground.... (Very Douglas Adams thought there...).
>
:-)))))))
>
>> Again, not enough data - but he would probably sink forever. AFAIK, the
>> density of a living human being is bigger than the density of water.
>
>Which is why you bob to the surface when you dive into a swimming pool...
>Think about it Alberto. We're 70% Water. A lot of the rest is fat and air
>spaces....
>
Yes, but James Bond is 80% muscles :-P
>Well, water is 25 times as dense as air? (Guessing completely...),
>
1000 times. Another advantage of using SI: density of water =
1000 kg / cubic meter, density of air ~= 1 kg / cubic meter.
[the exact number from...
http://www.york.ac.uk/depts/chem/course/studhand/gases.html
is: 1.293 kg / cubic meter at 0 deg C; BTW, in page...
http://www.york.ac.uk/depts/chem/course/studhand/stokes.html
there's a formula to compute the terminal velocity]
Alberto Monteiro
