What's wrong with this

[MarkE]

As we are talking buoyancy here,the mass weigh's 500kg's while submerged in water(sea water).

OK, now we are getting somewhere.  You mean that the object has 4900N wet weight.

So the disipated energy of it's 3.2km fall to the ocean floor must take into account all factors-eg,the energy to move the water being moved around the mass(displaced),and the energy of the final impact on the ocean floor.

Impulse and energy are different.

A mass of the same 500kg falling 3.2km through a vacume and then impacting the ground will have only the energy disipation of the impact on the ground. The total disipated energy of these two situations will have the same net result.

OK here is a problem:  You are referring to two objects one with 4900N wet weight, and a different mass that has 4900N dry weight.  If that's what you want, and it seems so, then you really need to qualify each of them as wet or dry weights.  Their masses are different.  That matters because when you go to calculate kinetic energy you need the mass of each which are different values.

This is why i said-a kg of grass weighs more that a kg of brick's,because your 500kg weighs more in a vacuum than it dose in water,where as my 500kg's of mass is relative to the enviroment in which it is in. So this brings to reason my question-what energy do we gain from a falling 500kg mass a distance of 3.2km,and what energy dose it take to raise a 500kg mass 3.2km. By my questions are based around that 500kg mass being in the same enviroment,where as you took them and placed them in two different enviroment's.

I get your reasoning, but it is backwards.  Absent viscous drag the work that we have to do to accelerate xxx kg mass is independent of density or the local value of G.  yyy N weight depends on the environment: G locally and what if any fluid atmosphere it is immersed in.  From an energy standpoint we can equate wet and dry weights under the conditions:  Acceleration is negligible, and viscous drag is negligible.  That pretty much means that they remain at rest at static heights, or we accelerate and move them very slowly.

Quote: Ayou proposing to condense the gas into fluid?
Now your getting close,but no energy is required to condence this gas into fluid.

I am pressed to think of a substance that does not have a heat of evaporation.

[tinman]

OK, now we are getting somewhere.  You mean that the object has 4900N wet weight.Impulse and energy are different.OK here is a problem:  You are referring to two objects one with 4900N wet weight, and a different mass that has 4900N dry weight.  If that's what you want, and it seems so, then you really need to qualify each of them as wet or dry weights.  Their masses are different.  That matters because when you go to calculate kinetic energy you need the mass of each which are different values.I get your reasoning, but it is backwards.  Absent viscous drag the work that we have to do to accelerate xxx kg mass is independent of density or the local value of G.  yyy N weight depends on the environment: G locally and what if any fluid atmosphere it is immersed in.  From an energy standpoint we can equate wet and dry weights under the conditions:  Acceleration is negligible, and viscous drag is negligible.  That pretty much means that they remain at rest at static heights, or we accelerate and move them very slowly.I am pressed to think of a substance that does not have a heat of evaporation.

I mean the bloody thing weighs 500kg's submerged-in other word's,you would have to apply a 500kg force in the opposite direction(up) to stop the mass sinking.This thing about vacume's was your instal to the conversation,and i fail to see what it has to do with any vessle or it's weight,or it's kinetic energy in regards to buoyancy. Im not interested in simulator's,im interested in real device testing and result's.Dose your simulator have an LED?,most i know do not. You have to simulate an LED to simulate a circuit that has an LED in it. Dose it take into account earth's gravity and magnetic field's?. Can it simulate a sinking object that weigh's 500kg when submerged-will it take into account the difference between salt and fresh water. What about current's and temp changes?.

Quote: I am pressed to think of a substance that does not have a heat of evaporation.
Please explain in english

[TinselKoala]

http://www.engineeringtoolbox.com/fluids-evaporation-latent-heat-d_147.html
Fluids require input of energy to change from liquid at a given temperature to gas at that same temperature. This energy is returned when the fluid condenses from a gas into a liquid again, at the same temperature.
The latent heat of evaporation for water, for example, is 2257 kiloJoules per kilogram, a not insignificant amount of energy.

http://www.falstad.com/circuit/
If you run the applet and then select from the "Circuits" top menu item, "Sequential Logic", you will find the LED Flasher which shows some example LEDs in a circuit, and by right-clicking on any of the LEDs you can see how to set the desired forward voltage and color of your LEDs in the simulation. They are diodes, after all, with a specific forward voltage drop. This is a very simple LED model, though.

More sophisticated circuit simulators like LTSpice  allow you to build your own more complete models for LEDs. Here is a company that makes some pretty sophisticated LED models for several circuit simulators:
http://electro-designs.ucoz.com/index/0-2

[MarkE]

I mean the bloody thing weighs 500kg's submerged-in other word's,you would have to apply a 500kg force in the opposite direction(up) to stop the mass sinking.This thing about vacume's was your instal to the conversation,and i fail to see what it has to do with any vessle or it's weight,or it's kinetic energy in regards to buoyancy. Im not interested in simulator's,im interested in real device testing and result's.Dose your simulator have an LED?,most i know do not. You have to simulate an LED to simulate a circuit that has an LED in it. Dose it take into account earth's gravity and magnetic field's?. Can it simulate a sinking object that weigh's 500kg when submerged-will it take into account the difference between salt and fresh water. What about current's and temp changes?.

Quote: I am pressed to think of a substance that does not have a heat of evaporation.
Please explain in english

Tinman:  mass and weight are related but very different things.  Newtons are a measure of force.  Kilograms are a measure of mass.  When you used the words:  "mass" and "kilogram" to describe weight and Newtons / 9.8m/s/s you conflated two different concepts.  I have explained to you that while one can talk about wet weight for GPE purposes, when you get around to doing any energy calculations that involve movement in a finite amount of time you need the mass.

Different simulators have different capabilities.  Any of many free circuit simulators will readily model your spinning wheel two coil arrangement with stunning accuracy.

You said that it takes no energy to convert the material you have in mind between liquid and gas states.  The energy to make that transition is called the heat of vaporization.  I don't know of any material where that value is zero.

[tinman]

You said that it takes no energy to convert the material you have in mind between liquid and gas states.  The energy to make that transition is called the heat of vaporization.  I don't know of any material where that value is zero.

No i didnt. I said it takes no energy to turn the gas into liquid. And like i said before,when this transition is taking place,energy is returned to the source that created it.