mersenneforum.org Math knowledge of the general population?
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2020-08-16, 23:07   #12
ewmayer
2ω=0

Sep 2002
República de California

2·5·13·89 Posts

Quote:
 Originally Posted by Uncwilly Their claim was that gravity is not a thing it is just things stratifying based upon their density.
Time to re-run a classic:

Evangelical Scientists Refute Gravity With New 'Intelligent Falling' Theory | Der Zwiebel

 2020-08-16, 23:15 #13 preda     "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<
 2020-08-16, 23:20 #14 lycorn     Sep 2002 Oeiras, Portugal 24·89 Posts Last fiddled with by ewmayer on 2020-08-16 at 23:57 Reason: There seems to be an echo in here...
2020-08-16, 23:34   #15
lycorn

Sep 2002
Oeiras, Portugal

59016 Posts

Quote:
 Originally Posted by preda 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<
The diameter is 8,000 miles, not the radius.

 2020-08-16, 23:44 #16 Uncwilly 6809 > 6502     """"""""""""""""""" Aug 2003 101×103 Posts 5×1,787 Posts
2020-08-17, 00:03   #17
The Carnivore

Jun 2010

3·71 Posts

Quote:
 Originally Posted by Uncwilly So, you keep trig tables in your head? And you can't use an equation? So no math to do math.....
You can use any equations that you know of.

2020-08-17, 00:14   #18
retina
Undefined

"The unspeakable one"
Jun 2006
My evil lair

5·11·107 Posts

Quote:
 Originally Posted by The Carnivore Math knowledge of the general population? Suppose you picked a whole bunch of American adults at random and asked them the following question:
I'm sorry but you lost me there. What do you want, "general population" or "American adults". They are not the same things.

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.

2020-08-17, 00:36   #19
The Carnivore

Jun 2010

3·71 Posts

Quote:
 Originally Posted by retina I'm sorry but you lost me there. What do you want, "general population" or "American adults". They are not the same things. 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.

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.

2020-08-17, 00:53   #20
The Carnivore

Jun 2010

3×71 Posts

Quote:
 Originally Posted by ewmayer Why waste time with idle hypotheticals when you can actually be out gathering some data? I suggest you procure some $100 bills and actually conduct the experiment you propose Hmmm, this may be a good idea for a GoFundMe campaign... Quote:  Originally Posted by lycorn LOL... The folks from FES would need to start their answer by explaining how the ship could disappear at all. 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. 2020-08-17, 01:09 #21 chalsall If I May "Chris Halsall" Sep 2002 Barbados 100100100111112 Posts Quote:  Originally Posted by The Carnivore I meant American adults. 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 2020-08-17 at 01:18 Reason: Stating simple truths. 2020-08-17, 01:26 #22 The Carnivore Jun 2010 3×71 Posts Quote:  Originally Posted by chalsall Sorry to break this to you, but the "Great" US of A is no longer all that important... It is when you're living in it! Quote:  Originally Posted by ewmayer Thus my answer rounded to the nearest int is that the ship will be (2.8+15.5) ~= 18 mi away from the observer at the point the top of its mast sinks out of sight. That took me the better part of an hour, so I would surmise that of a random sampling of adults, for sure < 10% would win the$100 ... probably < 1%, but I don't want to overestimate my own abilities.
Yeah, you're probably right. I did some research on this and can't believe how many people are bad at math:
https://phys.org/news/2018-03-high-a...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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