20200816, 23:07  #12  
∂^{2}ω=0
Sep 2002
República de California
2·5·13·89 Posts 
Quote:
Evangelical Scientists Refute Gravity With New 'Intelligent Falling' Theory  Der Zwiebel 

20200816, 23:15  #13 
"Mihai Preda"
Apr 2015
3·443 Posts 
Let the top of the ship A, the eye B, then the cord AB touches the earth circle in exactly one point T when the ship "starts to become invisible". Thus AB is tangent to the circle, and thus the radius OT is perpendicular to AB. Applying Pythagoras twice in triangles AOT and BOT:
Let's say OA== R+a, OB==R+b, (a== height of the ship, b==heigh of the eye), Pythagoras: AT==sqrt(a*(a+2R)) ~= sqrt(2*R*a) (because a<<R). Thus: sqrt(0.03*R*2) + sqrt(0.001*R*2)==4*sqrt(30)+sqrt(16), approx 25.8 Edit: mistake in approximating sqrt(30) :) Last fiddled with by preda on 20200816 at 23:20 
20200816, 23:20  #14 
Sep 2002
Oeiras, Portugal
2^{4}·89 Posts 
Last fiddled with by ewmayer on 20200816 at 23:57 Reason: There seems to be an echo in here... 
20200816, 23:34  #15  
Sep 2002
Oeiras, Portugal
590_{16} Posts 
Quote:


20200816, 23:44  #16 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
5×1,787 Posts 

20200817, 00:03  #17 
Jun 2010
3·71 Posts 

20200817, 00:14  #18  
Undefined
"The unspeakable one"
Jun 2006
My evil lair
5·11·107 Posts 
Quote:
The general population includes all people from all countries and territories of all ages. And "American adults" are a tiny subset of that from one country, one age group, and a different level of education competence. 

20200817, 00:36  #19  
Jun 2010
3·71 Posts 
Quote:
I did write "general population" originally, but gave it some thought and changed it to "American adults" in the post. But I forgot to change the thread's title. 

20200817, 00:53  #20  
Jun 2010
3×71 Posts 
Quote:
I doubt that there are enough flat earth believers to meaningfully affect the results. Even if there are two million of them, that's still less than 1% of the American adult population. 

20200817, 01:09  #21 
If I May
"Chris Halsall"
Sep 2002
Barbados
10010010011111_{2} Posts 
Sorry to break this to you, but the "Great" US of A is no longer all that important...
(We're letting you think you still are, while we activate programmed contingencies.) Edit: Also, just for the record, Santa Clause doesn't exist (except as a metaphor). And Jesus was statistically likely to have been black (or, at least, not terribly white). Last fiddled with by chalsall on 20200817 at 01:18 Reason: Stating simple truths. 
20200817, 01:26  #22  
Jun 2010
3×71 Posts 
Quote:
Quote:
https://phys.org/news/201803higha...hematical.html "Suppose, a litre of cola costs US$3.15. If you buy one third of a litre of cola, how much would you pay? ... The results (as seen in the table) allowed us to create an estimated range for the percentage of the adult population who would be able to answer the cola question correctly. ... Four in every ten adults in places like England, Canada, Spain and the US can't make this straightforward calculation – even when they had a calculator to hand. Similarly, less than half of adults in places like Chile, Turkey and South Korea can get the right answer." Ouch! 

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