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HammerBammer

Member Since 08 Sep 2017
Offline Last Active Yesterday, 04:04 PM
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Posts I've Made

In Topic: Freaky Music Videos

21 September 2017 - 05:44 AM

No love for Dragula?

 

 

edit:

Oh yeah and Fantasy

 

 

Or Black Hole Sun

 

https://www.youtube.com/watch?v=3mbBbFH9fAg

In Topic: Printed magnets

14 September 2017 - 11:08 AM

It's not that simple. The repulsion between two magnets is not a stable state. You can feel that when you point two equal magnetic poles towards each other. Yes they repel each other, but to stay aligned you need to hold them. 

Nature tends to states with minimum energy, and in this case that is two opposite poles pointed toward each other.

 

Even if you manage to print something that doesn't just flip over, you're still gonna have a magnetic field "run" over another magnetic field. That is going to induce some electrical currents and, depending on resistivity, probably heat.

 

That's basically how electromagnetic brakes and induction heating work. Permanent magnet are metals (can't think of one that isn't) and thus are conductive. If you have a varying magnetic field (like a magnetic train moving over a magnetic rail) you will have an induced current. And that is just bad.

 

That is one of the reasons why room temperature superconductive materials would revolutionise everything. Since the magnetic field doesn't penetrate them, there would be no induced currents. 

 

But you should check the Hyperloop project. They use magnets to center the "train" inside the tube and not let it touch the walls (no friction = no slowing down).

In Topic: Chemicals burning different colors

14 September 2017 - 07:18 AM

That's actually quite safe.

I've been in lab with all of those except for the second on the left. Still alive. 

In Topic: Printed magnets

14 September 2017 - 07:09 AM

I'm not sure when something like that will be available, I'm just excited to get the products.

I wonder if you could make a maglev track using them and not have to have superconductors. 

 

That's... That's not... Ok.

 

A permanet magnet, like the ones in the video or the ones on the fridge, create a strong magnetic field. When that field interacts with other ferromagnetic materials, like the fridge door, they induce a magnetic moment on that material, attracting the two bodies - aka, the magnet sticks on the fridge.

 

A superconductor REPELS magnetic fields - the Meissner effect. No field lines penetrate the superconductor. 

That's why you see magnets floating above superconductors. 

In Topic: How controversial would a teen show with this plot be?

14 September 2017 - 07:00 AM

I see no possible controversy.

Unless someone gets offended by the white military middle class kid with balanced political perspective saving the bullied and such.

 

SJWs would love it if the kid was a transexual indian vampire furry though.