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Engineers - Thermodynamics Exam Bonus Question

Oct 22, 2014
15,806
CAL 35 Cruiser moored EVERETT WA
Knowing that many who monitor this site have some form of engineering background and may have actually experienced the subject matter. I felt it worthy to share this posted exam bonus question... and one students answer.

The extra credit question response by one student was so 'profound' that the professor shared it with colleagues, via the Internet, which is why we now have the pleasure of enjoying it here.
Bonus Question: Is Hell exothermic (gives off heat) or endothermic (absorbs heat)?

Most of the students wrote about Boyle's Law (gas cools when it expands and heats when it is compressed) or some variant of those two mutually exclusive heat flows.

But only one student gave the following profound answer:

First, we need to know how the Mass of Hell is transitioning over time... So we need to know the rate at which souls are moving into Hell and the rate at which they are leaving. I think that we can safely assume that once a soul gets to Hell, it cannot leave. Therefore, no souls are outbound. As for how many souls are inbound to Hell, let's first consider the multiple religions that exist in the world today.

Most of these religions believe the only way to Heaven is through strict adherence to a rigorous belief system, otherwise you go to Hell. Since the vast majority of followers will fall far short of full behavioral compliance, we can project that the vast majority of souls go to Hell. Also, with global birth and death rates as they are, we can expect the number of souls in Hell to progressively increase exponentially, while remembering that Boyle's Law states that in order for the temperature and pressure in Hell to stay the same, the volume of Hell has to expand proportionately as souls are added.

This presents two possibilities:

#1. If Hell is expanding at a slower rate than the rate at which souls enter Hell, then the temperature and pressure in Hell will increase until Hell Boils Over.

#2. If Hell is expanding at a rate faster than the increase of souls in Hell, then the temperature and pressure will drop until Hell Freezes Over.

So which is it?

If we accept the postulate given to me by knock-out beautiful Mary during my Freshman year that, “It will be a cold day in Hell before I sleep with you,” and take into account the fact that I slept with her last night, then the #2 possibility above must be true, and thus I am sure that Hell is exothermic and has already frozen over. The corollary of this theory is that since Hell has frozen over, it follows that it is not accepting any more souls and is therefore extinct...Thereby Heaven is real which explains why, last night, Mary kept shouting “Oh My God.”

Student got an A+ !!
 
Jan 19, 2010
9,951
Hunter 26 Charleston
Speaking of thermodynamics.... I once restored a wreaked Coronado 23. It was a full on restoration with broken stringer and a lot of structural damage on the keel to hull joint.

When I was all done... I fitted her out with solar panels and two 55lb thrust trolling motors. No gas.

I named her The Delta Gee and painted this on her transom...

delta-G.JPG


Since my last name starts with a "G" and Delta sounds nautical, most of my dock mates thought it had something to do with my name.... only one old crotchety ex-engineer on the dock got the joke ......but it made me smile everytime I saw it. I might recycle that name some day if I ever get another boat with electric propulsion.
 
Jan 22, 2008
1,587
Hunter 34 Alameda CA
Speaking of thermodynamics.... I once restored a wreaked Coronado 23. It was a full on restoration with broken stringer and a lot of structural damage on the keel to hull joint.

When I was all done... I fitted her out with solar panels and two 55lb thrust trolling motors. No gas.

I named her The Delta Gee and painted this on her transom...

View attachment 198063

Since my last name starts with a "G" and Delta sounds nautical, most of my dock mates thought it had something to do with my name.... only one old crotchety ex-engineer on the dock got the joke ......but it made me smile everytime I saw it. I might recycle that name some day if I ever get another boat with electric propulsion.
Speaking of thermodynamics.... I once restored a wreaked Coronado 23. It was a full on restoration with broken stringer and a lot of structural damage on the keel to hull joint.

When I was all done... I fitted her out with solar panels and two 55lb thrust trolling motors. No gas.

I named her The Delta Gee and painted this on her transom...

View attachment 198063

Since my last name starts with a "G" and Delta sounds nautical, most of my dock mates thought it had something to do with my name.... only one old crotchety ex-engineer on the dock got the joke ......but it made me smile everytime I saw it. I might recycle that name some day if I ever get another boat with electric propulsion.
Chemists learn Gibbs Free Energy is represented by delta G. Engineers learn it as delta F. I know both because I started out as a chemist then became an engineer. :)
 
Oct 22, 2014
15,806
CAL 35 Cruiser moored EVERETT WA
@rgranger I understand "Delta - G".
What is with the crescent moon and star in the lower right corner of the image?
 
Jan 19, 2010
9,951
Hunter 26 Charleston
@rgranger I understand "Delta - G".
What is with the crescent moon and star in the lower right corner of the image?
That was a long time ago... my best recolection is that I grabbed some clip art that looked cool and sort of nautical and pasted that image together in MS-paint as a template of what I wanted to paint on the transom. In the end I only painted the delta with a G inside. My art skills are limited.:poop:
 
Oct 22, 2014
15,806
CAL 35 Cruiser moored EVERETT WA
Looked like you reversed Turkey's national flag symbol...

1631292485363.png


Or crescent moon - North Star thing...
 
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