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BrandyBoy72
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Blog Entries posted by BrandyBoy72
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This is a video of a levitating frog. Apparently a 10 Tesla magnetic coil is being used to lift him. This is possible because pretty much all organisms have small amounts of ferromagnetic materials inside of them. And no this does not hurt the frog because the force is spread out over the entire body, but he is probably freaking out a little bit inside.
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Some magnets are more, uh, magnetic than others?
Yes some magnets have a stronger magnetic force than others. Iron, nickel and cobalt atoms have more electrons orbiting in one direction than the other. This means they produce smaller currents like electromagnets. However, ferromagnetic metals like iron, nickel and cobalt like to line up into larger areas. These areas will line up, north to south like any other magnet if you put them in a strong magnetic field. You can even line up these areas yourself, maybe you've done this before, you take an actual magnet and rub it one way across a ferrous material like a paperclip, and in doing so you will line up the inside structure of the clip, making it a little magnetic for a while until it gets jumbled up again. With very strong magnets, like rare earth magnets, the structure of the alloy tends to make it very hard to change the direction of the magnetic field. This means that more of them stay lined up, and you get a stronger magnet.
So leave the heavy lifting to the rare earth magnet neodymium magnets and maybe just keep the fridge magnets around to hold up your physics grade sheet...
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Today at my locker, I took a stand against lockers everywhere. Every morning coming into school I visit my locker first thing to put away my jacket. I have been needing to wear a jacket for longer this year because of the ceaseless cold we've been having here in New York. To get to the point, I would come in from the cold wearing my jacket and go to my locker to put it away for the day. Like rubbing your socks on a carpet to induce a charge on yourself, the act of taking off my fleece jacket rubs it on my shirt, inducing the charge. This charge is then discharged when I touch my locker to hang up the jacket. If anyone else has also experienced this, they will know what kind of fear it can bring a person. The shock is unpleasant, yet not overly painful, but surprising nonetheless. This happens because the jacket rubs electrons off on my body, and then touching the locker which is grounded causes those electrons to leave, and in quite a hurry. So today I rebelled against this by throwing my jacket in my locker and then closing it with my show, which is insulated or something.
I haven't felt a shock yet today, I wonder if I still have excess electrons...
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A common use of a brush motor is in a fan, for example the type that is used to keep my laptop from overheating. But what exactly is that preventing, and what does overheating do to a system such as a laptop?
The fan helps to keep internal units cooled down, heat is created when there is resistance in the different hardware inside the computer. With all the units preforming very close to each other, a lot of heat can be generated. This is why keeping any appliance that generates a lot of resistance should be turned off when not in use, they are just draining unnecessary power and can create enough heat to cause a fire if given the proper (or rather improper) conditions. The fans used by such appliances serves to cool off the internal devices to a certain extent, and don't actually create that much heat themselves, which is useful.
There are alternative ways of keeping devices cooled down, fans are one type, but there are also liquid cooling systems which are less common and even a phase change unit, which uses a cooling technique similar to a refrigerator.
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