Wizard
Joined: Oct 14, 2009
• Posts: 23725
August 17th, 2012 at 7:59:47 PM permalink
I apologize if this has been discussed before, but this remains one of the unsolved mysteries of my life. I'm not big on unanswered questions, like who is "Mr. Sanders" as the sign says above Winnie the Pooh's door. However, let's not get into that. The question at hand refers to a hanging canopy at the LBS casino in the Red Rock. It looks like a college chemistry class blackboard. What I've been trying to get an answer to for years is the equation near the top, in the center.

The one that begins dV/dt=2πMy... There are some big brains on this site so can anybody offer any clues? Personally, I think it is just a made up equation, but am not sure.
It's not whether you win or lose; it's whether or not you had a good bet.
EvenBob
Joined: Jul 18, 2010
• Posts: 25333
August 17th, 2012 at 8:23:08 PM permalink
Whats in the mug below it? It has an arrow
pointing to the equation. Its a recipe for a
mixed drink.
"It's not enough to succeed, your friends must fail." Gore Vidal
AceCrAAckers
Joined: Jul 12, 2011
• Posts: 377
August 17th, 2012 at 8:34:40 PM permalink
dV/dt means change in volume over time. 2piMy looks like the circumference of beer mug and the other part would be other factors like size of the mouth and the rate of gulp or some other variable like this.

The equation looks like it is measuring how fast you can drink beer.
Edward Snowden is not the criminal, the government is for violating the constitution!
EvenBob
Joined: Jul 18, 2010
• Posts: 25333
August 17th, 2012 at 8:38:11 PM permalink
The expression "dv/dt" is calculus, meaning the rate of change over time.
"It's not enough to succeed, your friends must fail." Gore Vidal
EvenBob
Joined: Jul 18, 2010
• Posts: 25333
August 17th, 2012 at 8:40:19 PM permalink
Quote: AceCrAAckers

dV/dt means change in volume over time. 2piMy looks like the circumference of beer mug and the other part would be other factors like size of the mouth and the rate of gulp or some other variable like this.

The equation looks like it is measuring how fast you can drink beer.

I agree, thats why the beer mug has an arrow
pointing at the equation.
"It's not enough to succeed, your friends must fail." Gore Vidal
AceCrAAckers
Joined: Jul 12, 2011
• Posts: 377
August 17th, 2012 at 8:47:54 PM permalink
Quote: EvenBob

The expression "dv/dt" is calculus, meaning the rate of change over time.

/dt is change over time (denominator). Numerator is dV so they are measuring change of something related to change of something else. dV is probably volume.

Example dx/dt is change of distance over change of time. This is more commonly known as velocity.

dv/dt is change of velocity over time. This is more commonly known as acceleration.
Edward Snowden is not the criminal, the government is for violating the constitution!
Wizard
Joined: Oct 14, 2009
• Posts: 23725
August 17th, 2012 at 9:09:48 PM permalink
Thanks, but I knew the dv/dt part. What does the rest of it mean?
It's not whether you win or lose; it's whether or not you had a good bet.
AceCrAAckers
Joined: Jul 12, 2011
• Posts: 377
August 17th, 2012 at 9:17:28 PM permalink
2 pi M y looks to be the size of the mug. L(D) can mean how full it is. Sigma (D) is how much you can drink it, or how many gulps it take.
Edward Snowden is not the criminal, the government is for violating the constitution!
pacomartin
Joined: Jan 14, 2010
• Posts: 7895
August 17th, 2012 at 9:50:41 PM permalink
Quote: Wizard

Thanks, but I knew the dv/dt part. What does the rest of it mean?

Just a guess here, but I imagine that the V refers to Volume, and not velocity. It looks like it some kind of an estimate of the change in volume of the head of a beer as a function of the hops that are added.

It is a guess, but if there are 6 different kinds of hops and that strange symbol which looks like (£ or ₤) without the cross hatches stands for weights.

Another photo of equation in which there seems to be some indication that the head of the beer is related to the equation.

Seriously, guys. The Wizard is a mathematician. You don't have to tell him d()/dt is calculus. I had to understand this equation in my freshman year.
<->
thecesspit
Joined: Apr 19, 2010
• Posts: 5936
August 17th, 2012 at 11:31:39 PM permalink
Quote: pacomartin

Just a guess here, but I imagine that the V refers to Volume, and not velocity. It looks like it some kind of an estimate of the change in volume of the head of a beer as a function of the hops that are added.

It is a guess, but if there are 6 different kinds of hops and that strange symbol which looks like (£ or ₤) without the cross hatches stands for weights.

There's far more than 6 types of hops. I would guess head rentention, based on the words underneath the beer glass.
"Then you can admire the real gambler, who has neither eaten, slept, thought nor lived, he has so smarted under the scourge of his martingale, so suffered on the rack of his desire for a coup at trente-et-quarante" - Honore de Balzac, 1829