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More ways to get Braingle...

Not So Great Invention #2

Trivia brain teasers have some element of trivia in them, but they are not just pure trivia questions.

 

Puzzle ID:#16102
Fun:*** (2.72)
Difficulty:** (1.53)
Category:Trivia
Submitted By:od-1Aca****
Corrected By:Monique114

 

 

 



Not willing to give up after a failed attempt to invent a better windshield ice scraper, a would-be inventor decided that heated windshield washer fluid was the way to go. It would melt the ice with a very hot cleaning solution, thereby eliminating the need for scraping the ice off the front windshield. However, this invention proved a failure as well. Passing all tests done to insure it worked, it did indeed remove the ice effortlessly in record time. It even sold well initially, but was recalled for safety reasons.
Why?





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Comments

Rowsdower*
Jan 13, 2004

Just a question, because I'm unsure of something: Does windchill affect inanimate objects? I think I've been told that the wind makes it FEEL that cold, but isn't it still just the regular temperature? For example: If it's 10 degrees here and 10 degrees 5 miles away, isn't the wind still just 10 degrees even if I'm driving through it? I'm really not sure...
od-1Aca*
Jan 13, 2004

That a good question i'm not really sure. I do know it does increase the rate at which things cool down but I'm not sure if the end temp is affected. I'll have to look in to it. In any case it seems it was cold enough to crack the windshields .
cnmne*us*
Jan 14, 2004

Wind chill does not affect inanimate objects. It can never be colder than the real air temperature. The wind produced by a moving car will cause heat to be disappated more quickly than when standing still. The wind chill temperature is not what will cause the windshield to crack. However, the speed at which the temperature drops from the hot liquid to the air temperature might very well cause a break.
Bobbrt**
Jan 15, 2004

Cnmne's right. The speed of the car doesn't make the temperature lower, it just makes it get to the same final temperature faster. Also, glass doesn't crack because it's too hot or too cold. It cracks because part of it is changing temperature faster than another part. This creates stress in the glass (because half of it is trying to expand or contract and the other half isn't), causing the crack. The key to this teaser is the SPEED at which the glass changes temperature, not the temperature itself.
od-1Aca*
Jan 16, 2004

WELL there you have it thanks guys for the technical explanation,
Jon0513Aus*
Jan 18, 2004

i like these not so great inventions!
batti_s*
Jan 19, 2004

nice puzzle od!!!

bobbrt is right about the differential heating that causes glass to crack. that is the reason why very hot liquids are not poured fast into glass tumblers.
kcelf27**
Apr 26, 2005

Boy do I feel dumb. You guys are all to technical. It's amazing what you can learn while having fun!!!
froggyggAus*
Apr 28, 2005

Many, many years ago I just had to test out the do not put a hot piece of glass into (or pour into) cold water. Guess what?! I'll never use that measuring pitcher again!!! It works the same as your teaser and the cold windshield and hot cleaner. CRACK....Enjoyed this one even if it did remind me of my once favorite pitcher!
snaps*au*
Jun 27, 2005

Seems like the tests that were done to see if it worked weren't all that great...
smarty_blondy*ro*
Oct 01, 2005

As good as the first one.
peppamintp*us*
Nov 07, 2005

I knew the glass would crack but now I know why it cracks. Thanks for the info. Good teaser.



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