Recent content by Degu

Thank you very much for your answers, many of them brought me closer to the solution. It is an exercise to be honest, that is why I think that the answer has nothing to do with the facts of history

I think that the title of the topic is very self explanatory. I want to know what the explanation is for the different implementations, I reckon that it might have something to do with the density of air and water.

Why do you think that the thing we call spirit is not a creation of the mind, and if you are dead and your spirit leaves your body how come it will remember nothing when it is reborn in the body of an infant? Or did I misunderstood you and a "spirit" never returns or what? I'm trying hard to...

Thx, I wish that someone can come up with an idea why the work gained by diving the charges and letting them advance towards each other cannot cover that of pulling them apart and lifting them out of oil.

Thx kuengb, the only thing i don't understand in your explanation is why you think the force to lift the charges is bigger-or the work required to lift them out-naturally not considering gravity which is conservative.

Thx for your explanation I've found it very useful. But I further wait for more details.

I am a student at secondary school interested in physics and there is a problem I've been thinking about for two days: I just can't find out why the following perpetuum mobile doesn't work. Suppose we let two charges Q and -Q advance towards each other in air. We exploit the work done by the...