Posts by Kyle c

I really don't see why anyone can't see what I am saying is right?

The Buoyant Force of the similar objects is the same. Buoyant Force is based solely on VOLUME DISPLACED.
The ability of an object to sink or float is based on the objects weight and if it is greater than the Buoyant Force.

So in one post seaweed says,

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Bouyancy force is not the same for the bottles.

Then Tin man says,

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The buoyant force due to displaced water is the same in both bottles in your example

And I am the one that is wrong.....WTF?

I was done and I didn't want to offend anyone and I am still not trying to but you pop your head in and copy and paste something from Google that you obviously do not understand. Everyone is a genius because of Google these days. Along with quick quips and funny emot-icons internet forums have become a dangerous place for knowledge.

And what does what you posted have to do with the discussion we were having?

Wait Davie if I am wrong I will admit it maybe there is a miscommunication here.

Archimedes 1 st principle states " A body immersed in a fluid experiences a vertical buoyant force equal to the weight of the fluid it displaces."

If that is wrong tell me, if not then, the weight of that fluid is equal to the Volume of the fluid * Density of the fluid

So why is the Buoyancy in both cases not the same.

When you minus the mass of the body times gravity you are calculating the immersed weight of the body.

If you want me to measure it out I will but not now my girlfriend is already asking me what the hell is going on.

But the volume displaced by each is the same so the Buoyant Force on each is the same.

To determine if it floats or not is another story but Buoyant Force is not the MAIN determining factor at this point, that is what I was trying to say.

Sealed Bottle (Water inside w/ Orange Soda Mix (looks like piss I know)) notice displacement.

Sealed Bottle ( Air Inside Check Volume Displaced)

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But the total volume of the system (and therefore the volume of water displaced) is different

No they are the same volumes displaced same shape same material. I will show you give me a second, it won't be a pipe but the fundamental concept is the same.

I think that was the initial confusion neither one of us new what the other meant.

Are you saying the volume is the same or different between pipes A and B?

Sorry I am not sure how to quote but the part with, "They do have different volumes."

Its the same piece of pipe filled with water and one not filled the water the shape has not changed the dimensions have not changed the Volume is the same.

Damn looks like I am trouble maker, first I pissed off Dan with the fishing spots now Tin man who makes and uses spear guns, I have no future in the spear fishing community

I don't want to argue and I hope we are having a healthy discussion here.

But I'm sorry that is wrong, if you fill a tube with water cap off the ends and put it into a tank where you can measure the displaced volume this will be the same as a sealed tube with air.

Volume = Pi * Length * ( Outer Radius (squared) - Inner Radius (squared))

But a tube sealed off and a tube filled with water has the same buoyant force you have not changed the volume.

Yes but the factor is more deciding on whether it sinks or floats is based on the density of the material used.

In the case of spear guns when is the buoyant force ever greater than the weight of the gun?

I know this is on a case by case basis pipe guns sink, wood guns can sink or swim depending on the material, pneumatic probably float if there is air in it.

Let me know what you think I am only making assumptions:confused1:, I'm an engineering student so going on pure fluid mechanics, no real world experience here. Never even shoot a spear gun.

When a body is completely submerged in a liquid it displaces a volume of liquid equal to the volume of the object.
This volume of liquid has a mass and this mass is equal in magnitude to the buoyant force on the object.

Buoyant force though has nothing to do with whether the object sinks or floats though, well not really.

You could have a tennis ball submerged in water and it will always float back up but a ball of lead the same volume will sink, but both bodies have the same buoyant force.

If you had the right equipment it should be easy to do some measurements to find the amount of weight you need to add to make the gun neutral if it is floating.

I think.....

:good:

I don't have a wetsuit with a loading pad, nor do I have a gun, but from my undersanding ( I may be wrong, I'm here to find out) the pad is to provide friction against the butt to load the gun or is it for padding or both. :confused1:

If it is just for friction why not make it thinner but longer so it won't feel like an obstruction over your chest; while catering to the preference of a larger group of people.:idea2:

Commercial or Atlantic is where I wanna go one of these weekends probably a Sunday. I will let you know when my buddy and I will be heading out, you could meet us if you want.

I'll definetly take you up on that one day, where do you dive?

It isn't something locals do much at least not that I have seen. I didn't know anyone that did in the 16 years I lived there. Kinda sucks but I have been checking on google maps to see if there is anything off the shore I can get to when I get back.

Hey name is Kyle, started diving after I realized on my own you didn't have to just snorkel, then really got into it when I found out for could spearfish while doing it. Origianlly from Trinidad never did anything like that there though. Just started a couple months ago and really got into it dive off Boca Inlet mostly not much time to go any where else yet.