Anybody Believe This Tom Brady Dude?

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dee ee

Mountain climber

citizen of planet Earth

Jan 26, 2015 - 06:08pm PT

NOPE!

....and bicycle racing gets a bad rap because it does something about the cheaters.

Lorenzo

Trad climber

Oregon

Jan 26, 2015 - 06:21pm PT

The NFL has it backwards.

In my world The defense picks the balls.

The quarterback can challenge and if he's right it's worth 15 yards for his team.
If he's wrong it costs him 15.

neverwas

Mountain climber

Jan 26, 2015 - 06:40pm PT

Assume that
1) They were all at the minimum pressure of 12.5 PSI prior to the game
2) The actual volume change with small PSI changes is negligible.
3) The internal air temperature was 51 degrees F at halftime.

Gay-Lussacs Law says

P1/T1 = P2/T2 (temperature in Kelvin)

If the Refs measured halftime pressure at 10.5 PSI (and it's still not certain what the balls actually measured at) then the initial temperature would need to be 148 degrees Fahrenheit. If it was 11.5 PSI then the initial temperature would need to be 95.4 degrees.

The pressures also need to be absolute (i.e., add 14.7 psi) so this is not quite correct. I whipped up a bit of javascript in the node.js REPL, and have these results (temps in F, pressures in psig):

given: { p1: 12.5, t2: 51, p2: 10.5 }
result: t1 is 91.5 F

given: { p1: 12.5, t2: 51, p2: 11.5 }
result: t1 is 70.5 F

I've used this to calculate pressure in my bike tires for commuting in chilly weather from warm house to warm workplace:

given: { t1: 65, t2: -42, p1: 20 }
result: p2 is 12.9 psig

Seems to me that the refs handle the ball on every down... wouldn't they notice a deflated ball?

I'm not sure how much air diverges from an 'ideal gas' under these conditions, but we typically have low humidity

zBrown

Ice climber

Brujò de la Playa

Jan 26, 2015 - 06:51pm PT

In situations like this I always used to turn to Don Shula for advice, but as far as can be ascertained he is no longer available.

Vaya con Dios, don Shula

rottingjohnny

Sport climber

mammoth lakes ca

Jan 26, 2015 - 07:14pm PT

I believe Brady...Half of those guys think their catching a watermellon..

Peter Haan

Trad climber

Santa Cruz, CA

Jan 26, 2015 - 07:46pm PT

ß Î Ø T Ç H

Boulder climber

extraordinaire

Jan 26, 2015 - 07:59pm PT

Going back to my infancy, the playground chants and all that - cheaters were called out, but sore losers were worse.

Ed Hartouni

Trad climber

Livermore, CA

Jan 26, 2015 - 08:04pm PT

you guys know what absolute temperature is?

maybe you should look it up...

and don't forget to account for the atmospheric pressure, also...

this just in

climber

Justin Ross from North Fork

Jan 26, 2015 - 08:33pm PT

CNN went from Dawn Wall to Deflated Balls.

neverwas

Mountain climber

Jan 27, 2015 - 01:57am PT

... and don't forget to account for the atmospheric pressure, also...

Absolute temperature was accounted for by the previous poster, and I adjusted to absolute pressure, so I'm not sure what else might be wrong. Could be bugs in the code, but it passed some spot checks...

Gnome Ofthe Diabase

climber

Out Of Bed

Jan 27, 2015 - 02:17am PT

real for real? really ? I have only read a wee bit of this threads posts. . .
Is absolutely Zero, -273k? or something? now absolute Temperature? above my pay scale,
(amps) I certainly did not look it up.
Edit: reread. but now I have gone back and what can I say!

this thred iz a head ache wrapped in a thick fog, almost unaware that the world at large is suffering beheadings and terrorism, while we, the great society, 1st world types, worry about football!
And there is nothing wrong with that to a point , Definitely Deflated Ballzz is that point!

Cheating, in a game played by felons watched by fat unhealthy millions, who also consume
reality t.v. shows
big
don' believe the hype!

Climbers caught by the hype!!
NeeBee hit it square on the head, given the outcome,

Stripping the ball on every play is also 'like' cheating but that is the only advantage that the slightly reduced inflation effected(which, affected or effect Ed? that I may look up)😏

It is a silly football game . The big games were last week, and this is just sugar frosting on an okay season .

I am glad that the Hawks and the Pats are the two teams but will not be betting.

Eric Beck

Sport climber

Bishop, California

Jan 27, 2015 - 08:44am PT

Footballs inflated to 12.5 at 75F (294k).
Pressure remeasured a 35F (274K)..

Resultant pressure is ( 274/294 ) * 12.5 = 11.6

This is a non event, totally innocent.

i'm gumby dammit

Sport climber

da ow

Jan 27, 2015 - 09:02am PT

neverwas

Mountain climber

Jan 27, 2015 - 11:43am PT

Footballs inflated to 12.5 at 75F (294k).
Pressure remeasured a 35F (274K)..

initial absolute pressure is 12.5+14.7 = 27.2 psia
( 274/294 ) * 27.2 = 25.3 psia
final gauge pressure is 25.3-14.7 = 10.6 psig

Not trying to be argumentative here... I was riding (grinding along) my bike yesterday with about 4.5 psig rear, 6 in front, with over 100F temperature difference between inside and outside. If I could convince the tires to use only gauge pressure it wouldn't have been quite so bad.

divad

Trad climber

wmass

Jan 27, 2015 - 01:34pm PT

I haven't heard of any current QBs call Brady a cheater.

Hmm, why is that?

survival

Big Wall climber

Terrapin Station

Topic Author's Reply - Jan 27, 2015 - 01:47pm PT

Cuz they've all got their hand in the cookie jar too?

Plenty of Ex players calling him out though.

StahlBro

Trad climber

San Diego, CA

Jan 27, 2015 - 02:14pm PT

It is sad to see so many professional sports sacrifice their sense of honor and fairplay on the alter of fame and greed. As soon as something becomes big business people start to lose all perspective. The dark side of captialism.