Part V

[Smokin']

Originally Posted by 7.3 Rocket Yes, but aren't we assuming the water bed is laying flat? If the water bed was standing on end it would have far less surface area than the fridge. you bring up an interesting point. It is "assumed" that since it is a bed, it will be laying as a bed should lay...especially since a waterbed will not naturally sit on its end. After all, a waterbed is just a giant bag full of water. However, the fridge may still outweigh the bed, even if sitting on its end. Keep in mind the fridge sits on 4 small feet, like Jim mentioned.

[weekendwarriorfsw32]

Good Eveing every one. How is every ones night going so far?

[rbaker6336]

Originally Posted by Smokin'

After all, a waterbed is just a giant bag full of water. However, the fridge may still outweigh the bed, even if sitting on its end. Keep in mind the fridge sits on 4 small feet, like Jim mentioned.

But not if you lay the frig on it's side

[megawatt00]

Originally Posted by 7.3 Rocket

Yes, but aren't we assuming the water bed is laying flat? If the water bed was standing on end it would have far less surface area than the fridge.

RIght because the water bed wouldn't stand up to well on it's edge. But in theory if it could and be full of water then it would weigh more than the fridge.

Originally Posted by Smokin'

Bingo.

To be fair the only reason I knew the answer to that..is that I live with an engineer..and I am always getting speeches about various theories and laws that govern specific truths in everyday life.

2nd hand knowledge counts too Lisa!!!!!

Originally Posted by weekendwarriorfsw32

Good Eveing every one. How is every ones night going so far?

Hey Nick. Welcome to the science club.....

[7.3 Rocket]

I think we're underestimating the weight of water here. That's why I want to know the measurements of the bed.

Let's say we have a framework that weighs 0 and has no surface area that will keep the waterbed on end. If the waterbed holds 50 gallons of water that's 400 pounds. I honestly couldn't even begin to guess how much water is in a waterbed since the waterbed fad was before my time.

Evening, Nick. We're just talking about engineering things.

[weekendwarriorfsw32]

Sweet I love engineering things!!!

[Smokin']

Originally Posted by 7.3 Rocket

I think we're underestimating the weight of water here. That's why I want to know the measurements of the bed.

Let's say we have a framework that weighs 0 and has no surface area that will keep the waterbed on end. If the waterbed holds 50 gallons of water that's 400 pounds. I honestly couldn't even begin to guess how much water is in a waterbed since the waterbed fad was before my time.

Evening, Nick. We're just talking about engineering things.

for that to be true, the bed would have to outweigh the fridge considerably. Lets put pen to paper. LEts go back to our formula.

Force/area = PSI.

Lets say the bed weighs 400 lbs. Lets say the end of the bed measures 60" wide and 10" tall. That's 600 square inches of surface area. Lets put that into the formula.

400/600 = .666 PSI.

Lets do the same for the fridge. Lets say the fridge weighs 400 lbs. Lets say the fridge has 4 feet, each of which is 2" x 2". Each foot is 4 square inches. 4 of those add up to 16 square inches. Lets put that into the formula.

400/16 = 25 PSI

I'm not a math person but I think those numbers are right.

[megawatt00]

Originally Posted by 7.3 Rocket

I think we're underestimating the weight of water here. That's why I want to know the measurements of the bed.

Let's say we have a framework that weighs 0 and has no surface area that will keep the waterbed on end. If the waterbed holds 50 gallons of water that's 400 pounds. I honestly couldn't even begin to guess how much water is in a waterbed since the waterbed fad was before my time.

Evening, Nick. We're just talking about engineering things.

In that case the water bed would be heavier. In the example (that was one that I had many moons ago in high school) you assue that the water bed is in it's normal position. It's kinda like a trick question like what weighs more a ton of bricks or a ton of feathers.

[triskit16]

Anyone ever seing the image in science class or something talking about this...

There was an elephant standing on a platform and a woman with a high heeled shoe on and the pressure from just her heel was equal to the elephants weight spread out. I think it was something about either this or hydraulics.

I could just be not remembering this at all...

[7.3 Rocket]

I have a hard time believing an empty fridge weighs 400 pounds. That's just me. Like I said before. I need numbers.

[Smokin']

Originally Posted by triskit16

There was an elephant standing on a platform and a woman with a high heeled shoe on and the pressure from just her heel was equal to the elephants weight spread out. I think it was something about either this or hydraulics.

I could just be not remembering this at all...

Yep...this one...Pressure Under High Heels. Hydraulics work under the same principle. LOTS of pressure, very small area.

[megawatt00]

Originally Posted by 7.3 Rocket

I have a hard time believing an empty fridge weighs 400 pounds. That's just me. Like I said before. I need numbers.

Don't worry about it bro. Did you understand what I ment by the spiderweb cradle?

[Smokin']

Originally Posted by 7.3 Rocket

I have a hard time believing an empty fridge weighs 400 pounds. That's just me. Like I said before. I need numbers.

Fair enough. Lets cut the fridge's weight in half..and double the weight of the bed. If we use our formulas, the bed is still only at 1.3 PSI...the fridge is at 12.5 PSI.

[7.3 Rocket]

I understand what you mean, Jim.

Lisa: There's 144 square inches per square foot just so you know. 12 inches by 12 inches multiplied is 144.

Enough math, guys. I still haven't done my Geometry homework yet.

[Smokin']

Originally Posted by 7.3 Rocket

Lisa: There's 144 square inches per square foot just so you know. 12 inches by 12 inches multiplied is 144.

Yes I know. I was working in inches, and it was just width x length. Square inches works in the same fashion as square footage. Since we were wanting to know PSI..

Sorry guys. Enough math. I actually have a huge placement test tomorrow, a math/science/english placement test that I MUST pass. There isn't much studying I can do to prepare for it so it helps me to get into this mode of thinking.