Silly physics...

Jochen Schröder jschrod at
Wed Feb 12 15:28:22 PST 2003

torsten wrote:
> On Wed the 12 Feb 2003 at 13 hours EST
> JC wrote...
>>rbpark-NOSPAM at (Rob Park) writes:
>>>What I'm trying to say, is that the two electrically charged balls were
>>>3 cm apart, give or take 400,000 km. Note that the moon is less than
>>>400,000 km away from the Earth. So, we really have no way of being
>>>certain that the little styrofoam balls weren't on the moon...
>>I did a lab in high school where one determines the acceleration due
>>to gravity by swinging a pendulum.  The result should have been 9.8
>>m/s^2, but we got 8.8 m/s^2.  I still don't know what we did wrong.
> Where were you?  Gravity varies exponentially with distance from
> a massive body.  It is only 9.8m/s/s at sealevel.  After that, it
> decreases dramatically.
> Torsten

What?!!! Gravitation is F=G*M1*M2/r^2 , so g=G*M(earth)/r^2 where r is 
from the earth center, it does not decrease exponentially. There 
wouldn't be any life on this planet if it would(no atmosphere). Also 
flying would be more like going to space ;-)

[X] Nail here for new monitor

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