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Cheating only if you get caught!

Posted by zerodegreec 
Dazed_Driver
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Re: Cheating only if you get caught!
December 17, 2012 04:53PM
You're missing the point.

You're thinking of buoyancy...

"Therefore, if you were to fill a 1-liter soda bottle full of helium, the bottle would weigh about 1 gram less than the same bottle filled with air. That doesn't sound like much -- the bottle itself weighs more than a gram, so it won't float. However, in large volumes, the 1-gram-per-liter difference between air and helium can really add up. This explains why blimps and balloons are generally quite large -- they have to displace a lot of air to float." http://science.howstuffworks.com/helium2.htm



While yes, the helium is less than air... a pipe filled with nothing is LESS than a pipe filled with helium, which in turn is LESS than the pipe filled with air.

The goal here isn't to lift the car, its to make it lighter. Therefore, reducing the mass of anything in it would reduce the total weight. So, in turn, pulling a vacuum inside the cage, removing ANY gas, will make it lighter than if it had ANY gas in it. Vacuum > lighter (provided same volume, pressure, ect. You remember physics right? Everything is a block on a ramp.... grinning smiley )

Also, remember that Weight = MG as weight is a force. So, the mass times the acceleration of gravity. What weights 100 pounds on Earth would weigh less on the moon, as it has less gravitational pull. So calling it weight, in this case, as that's what we're concerned with, is perfectly ok.



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Dazed_Driver
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Re: Cheating only if you get caught!
December 17, 2012 04:56PM
Another way to think about it. Air is a fluid.

Fill a glass with water. Weigh it.

Dump it.

Fill the same glass with gasoline. Weigh it.

Dump out the gas. Weigh it.



Get it yet?

Gas will float on water, much like helium floats in air. But when the empty glass is weighed, its less than the glass with gasoline... even though that glass is still lighter than the glass filled with water.

EDIT twice, double typo fail



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Edited 2 time(s). Last edit at 12/17/2012 04:57PM by Dazed_Driver.
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fliz
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Re: Cheating only if you get caught!
December 17, 2012 05:11PM
next mod: fill the rear hatch area with a large vacuum box!
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Dazed_Driver
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Re: Cheating only if you get caught!
December 17, 2012 05:17PM
Either way, the chuckle that idea was supposed to get has been completely lost... sad smiley



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SteveL
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Re: Cheating only if you get caught!
December 17, 2012 05:30PM
Timm, you'll have to do a bit of thinking before you try to cheat, and I'm not
going to give you any hints...



SteveL
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Dazed_Driver
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Re: Cheating only if you get caught!
December 17, 2012 05:37PM
Actually, I think I would need to have a finished car before I could cheat.



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SteveL
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Re: Cheating only if you get caught!
December 17, 2012 05:48PM
No Timm, a finished car is more difficult to cheat with...



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Re: Cheating only if you get caught!
December 17, 2012 05:57PM
Anti down force. Make the entire exterior of the car have a large helium balloon so that the car seems to weigh less.



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Re: Cheating only if you get caught!
December 17, 2012 06:07PM
You don't care about weight in the car (except when talking traction). It's mass you really want to reduce. Yes, vaccuum is better than helium or anything else. Even thought helium will make the car weigh less, it still has mass you have to accelerate and decelerate.

It was a goofy response to a goofy idea.

Might as well seal the whole interior of the car and suck all the air out. Driver and co-driver can hold their breath. It'll motivate you to go faster to get to the end of the stage too.

Tim.
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Re: Cheating only if you get caught!
December 17, 2012 06:41PM
Quote
SteveL
No Timm, a finished car is more difficult to cheat with...

Well, in that case, I have no idea what you're talking about, and frankly my dear, I don't give a damn grinning smiley



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