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Famous numbers

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Rigil Kent
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« on: July 27, 2012, 06:19:32 AM »

Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

46664

149,597,870.7



Rigil

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st0nes
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mark.widdicombe1
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« Reply #1 on: July 27, 2012, 06:43:33 AM »

Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

46664

149,597,870.7



Rigil


Pi
Nelson Mandela's prison number
My bank balance
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Faerie
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« Reply #2 on: July 27, 2012, 07:37:25 AM »

My bank balance

Are you single?

 Grin

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st0nes
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« Reply #3 on: July 27, 2012, 07:56:09 AM »

My bank balance

Are you single?

 Grin


Unfortunately not.
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Mefiante
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« Reply #4 on: July 27, 2012, 08:17:16 AM »

The third number is the conversion from AU to km.

(They lied to you at school.  22/7 is not π.  It’s a rational approximation to π that already fails at the third decimal.  π is a transcendental number which means it has no finite expression involving only rationals and/or surds. A better rational approximation is 333/106.  An even better one is 103,993/33102.)

2.718281828459…

½ (1+√5)

7.29735×10–3

6.022×1023

0.577215664901…

299,792,458

As the man said, no peeking.

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bobilus
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« Reply #5 on: July 27, 2012, 14:49:20 PM »

Quote
2.718281828459…

½ (1+√5)

7.29735×10–3

6.022×1023

0.577215664901…

299,792,458

1. e^1

2. No idea

3. alpha, cant remember the name.

4. Avogadro constant

5. no clue.

6. Speed of light in vacuum (m/s)

Here is a few extra.

8.314

9.8066

6.62608 x 10-34

1.602177 x 10-19
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BoogieMonster
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« Reply #6 on: July 27, 2012, 15:08:21 PM »

Quote
½ (1+√5)

The golden ratio.

Wild guesses:

Quote
6.62608 x 10-34

mass of a neutrino...

Quote
1.602177 x 10-19

and electron? The second one rings a bell along those lines...
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brianvds
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« Reply #7 on: July 27, 2012, 17:25:40 PM »

Nominal, cardinal or ordinal, several numbers are often instantly (or eventually) recognisable. So without peeking, who can identify the three below?

22/7

Approximation of pi.

Quote
46664

Madiba.

Quote
149,597,870.7[/b]

Astronomical unit.

Well those are my guesses. Lemme scroll down and see if I was right. :-)

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Mefiante
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« Reply #8 on: July 27, 2012, 18:12:01 PM »

1. e^1

4. Avogadro constant

6. Speed of light in vacuum (m/s)
All correct. (No. 1. is the base of the natural, or Napierian, logarithm.)

2. No idea
BoogieMonster got that one right.  It’s the exact expression of the Golden Ratio, φ.

3. alpha, cant remember the name.
Yes, the symbol commonly used for this physical constant is α.  It’s the fine structure constant.

5. no clue.
A tricky one, this.  I won’t reveal it yet in case someone would like to guess.  (Hint:  It comes from number theory.  Its decimal and continued fraction expansions are both aperiodic but it is not known whether the number is algebraic or transcendental.)



8.314
That’s the gas constant (in SI units).

9.8066
The standard value of g (in SI units), the acceleration due to Earth’s gravitational field at mean sea level.

6.62608 x 10-34
Planck constant (in SI units), the basic unit of energy quanta in QM.

1.602177 x 10-19
Unit of electrical charge, Coulombs.

Two more, both around 4:

4.669201609…

4.186

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Rigil Kent
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« Reply #9 on: July 27, 2012, 18:49:40 PM »


0.577215664901…
Is it the Riemann convergent thingy?


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Mefiante
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« Reply #10 on: July 27, 2012, 19:01:34 PM »

Well, it is the value to which a particular expression converges but Riemann is not associated with it.  Another very famous mathematician is.

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bobilus
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« Reply #11 on: July 28, 2012, 01:47:17 AM »

4.186 - Heat capacity of water.
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Rigil Kent
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« Reply #12 on: July 28, 2012, 07:58:40 AM »

4.669201609… - The heat capacity of slightly more water ...    Cheesy
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Rigil Kent
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« Reply #13 on: July 28, 2012, 12:10:01 PM »

A few more from pop culture:

22

42

101

664


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brianvds
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« Reply #14 on: July 28, 2012, 14:48:38 PM »

A few more from pop culture:

22

Catch-

Quote
42

Answer to life, the universe and everything.

Quote
101

Dalmatians? (I have actually never seen the film, or read the book, assuming there was a book in the first place.

Quote
664[/b]

No idea. I'm not THAT clued up on pop culture. :-)
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brianvds
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« Reply #15 on: July 28, 2012, 14:50:59 PM »

More from popular and semi-popular culture:

1984

1000 000 000 and 1000 000 000

2001

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Rigil Kent
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« Reply #16 on: July 28, 2012, 15:40:18 PM »

... Catch- ... Answer to life, the universe and everything ... Dalmatians ...

Not bad, not bad at all! "101" has several associations, as Google will instantly reveal. The 101 Dalmatians (1956) - which was soon followed by the classic Disney movie - is certainly one. Its also used in denoting a basic, general course in some subject or the other, such as Psycology 101.

Quote
Quote
664[/b]

No idea. I'm not THAT clued up on pop culture. :-)


664? Why, that would be the neighbour of the beast. Wink

Ok, yours:

1984 - A George Orwell dystopian novel. I think the term "Big Brother Watching" was coined somewhere in it's pages.

1000 000 000 and 1000 000 000 - not too sure ... might be from a song by Tori Amos.

2001 The Stan Kubrick flick.


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« Last Edit: July 29, 2012, 07:20:25 AM by Rigil Kent » Logged
brianvds
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« Reply #17 on: July 29, 2012, 05:31:48 AM »

1984 - A George Orwell dystopian novel. I think the term "Big Brother Watching" was coined somewhere in it's pages.

If you have not read it, you should. Everyone should. And coming from someone who very seldom reads any fiction, that says something. :-)

Quote
1000 000 000 and 1000 000 000 - not too sure ... might be from a song by Tori Amos.

Hmm, I notice now I actually kind of screwed up the phrase. It should more properly be 1000 000 000s and 1000 000 000s.

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brianvds
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« Reply #18 on: July 29, 2012, 05:39:37 AM »

A few more:

57.295...

1642

1652

1859

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Mefiante
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« Reply #19 on: July 30, 2012, 09:54:02 AM »

1000 000 000s and 1000 000 000s.
Milliards & Milliards: Thoughts on Life and Death at the Brink of the Millennium, a 1996 book by Barry Sagan, Carl’s lesser-known twin brother who, separated at birth, grew up in the UK. Wink
 
57.295...
Radians-to-degrees conversion factor for angles.  (Also, a good Celsius temperature at which to set your geyser.)

1642
Isaac Newton’s birth year (according to the Julian calendar; the Gregorian one was not yet in effect in England at that time).

1652
The year Jan van Riebeeck arrived in Cape Town.  (Had a school child’s help with this one.  Early SA history is not our strong suit.)

1859
Publication year of Darwin’s On the Origin of Species.

'Luthon64
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Rigil Kent
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« Reply #20 on: July 30, 2012, 11:18:28 AM »

.... Carl’s lesser-known twin brother who, separated at birth, grew up in the UK. Wink
I must pay more attention to emoticons .... just spent 20 minutes trying to find some bumf on this guy! Roll Eyes
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brianvds
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« Reply #21 on: July 30, 2012, 13:38:19 PM »

Isaac Newton’s birth year (according to the Julian calendar; the Gregorian one was not yet in effect in England at that time).

And also the year Galileo died. Perhaps his soul simply moved from one body to the next. :-)
Galileo, in his turn, was born the same year Michelangelo died: 1564.

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Rigil Kent
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« Reply #22 on: December 06, 2016, 21:13:00 PM »

Not a particularly well known number, but somewhat comforting if you enjoy chess, and worry about accidentally repeating a game in your lifetime.

10120

(click to show/hide)




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