You-Read-It-Here-First Forum Index You-Read-It-Here-First
A collection of textual novelties
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 
If you want to read the articles here, go ahead, just click on a forum and find a thread that interests you...no need to register! If you want to post something... either new or in response to someone here, then click the Register link above. It's free... and it's fun to write your ideas here. You can even create a "blog" by starting a personal thread in the Daily Life Every Thread A Diary section...

It's baffling

 
Post new topic   Reply to topic    You-Read-It-Here-First Forum Index -> Turns of Phrase
View previous topic :: View next topic  
Author Message
brian-hansen
Site Admin


Joined: 17 Mar 2006
Posts: 712
Location: Oregon

PostPosted: Fri Sep 28, 2007 10:12 am    Post subject: It's baffling Reply with quote

Here's a question for you: How do they keep all the gas in your tank
from sloshing around when your car moves?





[used May 2001, written earlier]
Back to top
View user's profile Send private message Visit poster's website
Visit the Instant Postcard Collection @ http://instant-postcard-collection.com
Looking for postcards of that favorite place? Family origins? Or that perfect vacation, except for the photos?
Researching your dissertation? Serious collector? Just looking for something neat?
You've found the right place to add to your existing collection, or to start a new one.
Time Clock



Joined: 11 Sep 2008
Posts: 47
Location: Vancouver, WA

PostPosted: Thu Sep 11, 2008 1:18 pm    Post subject: Boggles the mind Reply with quote

"Boggles the mind" - A phrase I heard Pierce Brosnan use in the 80's on "Remington Steele", and have used ever since :)

In my car the gas DOES slosh around.... Doesn't everyone's?

But here's a stumper for you...

Why does a mirror always flip everything left-to-right, never top-to-bottom? Even if I turn a mirror on it's side it still flips everything left-to-right. This had me stumped for a while...

:)
Back to top
View user's profile Send private message Visit poster's website
brian-hansen
Site Admin


Joined: 17 Mar 2006
Posts: 712
Location: Oregon

PostPosted: Thu Sep 11, 2008 3:53 pm    Post subject: Reply with quote

Without baffling, it would slosh more.

I think I've heard the left/right thing before. It may take me a
little while to remember the answer. Don't let that stop
you from posting the answer if you like.

-Brian
Back to top
View user's profile Send private message Visit poster's website
Time Clock



Joined: 11 Sep 2008
Posts: 47
Location: Vancouver, WA

PostPosted: Thu Sep 11, 2008 6:03 pm    Post subject: mist it Reply with quote

Doh!

Completely missed the whole point of your baffling title - which makes me feel like an idiot given the topic of the forum, sheesh.

That mirror teaser I invented myself, but I did post it at answers.com or somewhere so maybe it's finding it's way around.

Here's another that I made up myself, and haven't posted anywhere:

Take 2 car tires, fill one with 32 PSI air, and then over-inflate one to 40 PSI.

Throw them both in a lake. Which floats better: the one with more air or the one with less? My friends and family can't agree on the answer.
Back to top
View user's profile Send private message Visit poster's website
Visit the Instant Postcard Collection @ http://instant-postcard-collection.com
Looking for postcards of that favorite place? Family origins? Or that perfect vacation, except for the photos?
Researching your dissertation? Serious collector? Just looking for something neat?
You've found the right place to add to your existing collection, or to start a new one.
brian-hansen
Site Admin


Joined: 17 Mar 2006
Posts: 712
Location: Oregon

PostPosted: Thu Sep 11, 2008 6:23 pm    Post subject: Reply with quote

I think I've got an answer to the tire inflation question.

The way I see it, there are 2 things going on, each of which
leads to a prediction in the opposite direction.

On the one hand, overinflating the tire will make it bulge out
more, increasing the amount of air in the tire. Assuming the
extra weight of the extra air is small, the fact that there is more
air will decrease the overall density of the tire, helping it float.

On the other hand, increasing the pressure of the tire in the
absence of tire bulging will clearly increase the density of the
air, and will increase its overall weight.

It is natural to imagine what happens to your tire when you
overinflate it, that it does bulge in this way.

The key to this puzzle is to imagine an extreme case. If you
inflated the tire to 1,000,000 psi (assuming it didn't explode),
then there's no way that the bulge could compensate for the
extra density of air in the tire. It would weigh more, and
would probably sink.
Back to top
View user's profile Send private message Visit poster's website
Time Clock



Joined: 11 Sep 2008
Posts: 47
Location: Vancouver, WA

PostPosted: Thu Sep 11, 2008 6:53 pm    Post subject: floating a theory Reply with quote

Nice answer :)

And I think you're right that the bulge does not keep up with the added air.

You'd be surprised how many people think that "air floats, so more air floats more".

I tell them that if you keep adding air, eventually you get liquid air, and they have no problem believing THAT will sink. When I'm bored at a party I ask people stuff like that.

Yeah, I don't fit in well at parties...
Back to top
View user's profile Send private message Visit poster's website
brian-hansen
Site Admin


Joined: 17 Mar 2006
Posts: 712
Location: Oregon

PostPosted: Sat Sep 13, 2008 9:46 pm    Post subject: Re: floating a theory Reply with quote

Time Clock wrote:
... I think you're right that the bulge does not keep up with the added air.


While I'm glad you found some good things to agree with me about,
my sense is that you don't agree with my opinion as to the answer
to your original question: I think the overinflated tire will float better.

So long as they don't overuse it (cf. "at the end of the day"), I like
it when speakers say "... and I'll tell you why."

I'm not sure what parties you go to, but when I go to a party its
not much of a party unless we can do something like removing
the tires from the host's car, overinflating them, and throwing them
in a lake weighted down in order to see how well they float.
That's just me. Direct science. That's how I roll.

If I didn't have access to such a party (and I notice that invitations
seem to be growing rarer), I would consider an engineering
approach. There's a fair amount of information to collect, including
elasticity of the rubber, volume of air enclosed, weight of the tire,
density of air at various pressures, etc. I'm not in search of a
thesis topic, and nobody is paying me to do this, so its no party.

No, and thanks for indulging me so far, my preferred approach
is based on crude observations, physical intuition, and an
appreciation of how little the air in a tire weighs in relation to
the weight of the tire itself. I think the pressures inside the tire
would have to be quite great before the corresponding weight
of the denser air would counteract the reduction in overall density
contributed by the bulging of the tire. Probably any kind of
commercially available automobile tire would explode before
enough extra weight could be reached to start to decrease the
buoyancy.

Yeah, well, I guess I don't do that well at parties either, now
that I think of it.
Back to top
View user's profile Send private message Visit poster's website
Visit the Instant Postcard Collection @ http://instant-postcard-collection.com
Looking for postcards of that favorite place? Family origins? Or that perfect vacation, except for the photos?
Researching your dissertation? Serious collector? Just looking for something neat?
You've found the right place to add to your existing collection, or to start a new one.
Display posts from previous:   
Post new topic   Reply to topic    You-Read-It-Here-First Forum Index -> Turns of Phrase All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group