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Can A Magnet Levitate A Grown Man? Crush His Hand?

Hits: 5285 | Rating: (2.7) | Category: Science | Added by: ElectricEye
Page: 1 2 Next >   Jump to: Bottom    Last Post
Tiredofnicks
Male, 30-39, Europe
 4950 Posts
Sunday, December 22, 2013 4:57:52 AM
drawman61: Unfortunately that doesn't work either, each time you make a magnet do work you degrade its field strength somewhat, up until the point where it will be completely drained and energy needs to be added to it for it to do its thing. The laws of thermodynamics makes stuff so boring. :(

Nickel2
Male, 50-59, Europe
 4873 Posts
Sunday, December 22, 2013 2:47:34 AM
Slide them sideways.

carmium
Female, 50-59, Canada
 6406 Posts
Saturday, December 21, 2013 9:14:56 PM
How do you get two of those magnets apart once they touch each other?

Angilion
Male, 40-49, Europe
 11744 Posts
Saturday, December 21, 2013 6:30:31 PM
Angilion, why do you say that maglev doesn't reduce the amount of power required to accelerate the train's mass? If the friction coefficient is drastically reduced, doesn't that directly reduce the amount of power required to accelerate? I'm not disagreeing, I'm genuinely asking.


And you're right...but rolling resistance on a train with steel wheels on a steel track is not very high. Wheeled trains are suprisingly efficient in that respect.

So yes, maglev has lower power requirements for acceleration than a wheeled train...but not as much lower as it might seem. It also has an additional power requirement for any functioning - generating the magnetic field.

Also, some versions of maglev require wheeled movement at lower speeds anyway.

I was wrong in ignoring rolling resistance, but I *think* that overall I am right about power requirements being similar.

Javien
Male, 18-29, Eastern US
 273 Posts
Saturday, December 21, 2013 6:07:51 PM
He was technically floating, wasn't he?

drawman61
Male, 50-59, Europe
 6275 Posts
Saturday, December 21, 2013 4:43:59 PM
Sorry, I meant free propulsion.

Tiredofnicks
Male, 30-39, Europe
 4950 Posts
Saturday, December 21, 2013 11:10:59 AM
The character limit is a lie!


cont'd:
...current set of natural laws.

Also Mikeoxsbiggg, here's a picture for you, may it serve you well.


Tiredofnicks
Male, 30-39, Europe
 4950 Posts
Saturday, December 21, 2013 10:58:26 AM
drawman61: Surely these forces could be used for propulsion

An electric motor does precisely that.


Mikeoxsbiggg:
Something about creating a magnetic field to counteract the earths. It was tested then shut down quickly and never developed.

I'm not quite sure what you mean by "counteract the earths" but I will bite anyway, correct me if I misinterpreted it.

The Earth's magnetic field at surface level is somewhere around 0.000 031 tesla. An average fridge magnet puts out 0.005 tesla, (161 times greater) and the loudspeaker likely sitting near your computer has a magnet in it with roughly 1 tesla's worth (a whopping 32 258 times greater than the Earth's), and yet none of them spontaneously floats away because of many things, but mainly that it takes many times again the field strength to counteract the pull of gravity.

In short, it got abandoned because it's vastly inefficient and unlikely to improve with the

SmagBoy1
Male, 40-49, Southern US
 4243 Posts
Saturday, December 21, 2013 8:19:20 AM
Angilion, why do you say that maglev doesn't reduce the amount of power required to accelerate the train's mass? If the friction coefficient is drastically reduced, doesn't that directly reduce the amount of power required to accelerate? I'm not disagreeing, I'm genuinely asking.

bacon_pie
Male, 30-39, Southern US
 2819 Posts
Saturday, December 21, 2013 6:17:54 AM


Nickel2
Male, 50-59, Europe
 4873 Posts
Saturday, December 21, 2013 4:04:12 AM
The force is strong with this... etc.
Hard-drives contain strong magnets. If you allow those to collide, they shatter and send out very sharp fragments at great speed that cut into your skin. That was quite enough for me, respect the magnets, they are not toys!

Draculya
Male, 40-49, Asia
 12741 Posts
Saturday, December 21, 2013 1:22:08 AM
@Gerry1of1 A few years back I nearly lost the tips of 8 fingers in a magnetic chuck made out of Nd magnets a half inch thick and the size of a shoe box. There are procedures to follow and I didn't. The entire 30lb vise lept off the bench and attached itself to the heavy metal plate I was holding. I hadn't expected that. It felt like double fisting a meat grinder. You wouldn't believe how thin you can crush fingertips and make a full recovery, or I'd be typing with two thumbs and stumps.

Gerry1of1
Male, 50-59, Western US
 33911 Posts
Friday, December 20, 2013 10:18:05 PM

"Surely these forces could be used for propulsion"

If only we could turn them on their sides and put an axel between the two wheel-like magnets.

Angilion
Male, 40-49, Europe
 11744 Posts
Friday, December 20, 2013 10:13:52 PM
The best use for magnets wheni t comes to transportation is having the train hover over the tracks this reduces the friction which requires a a substantially less amount of power to move and get up to speed.


True...but the biggest power drains for a train are accelerating the mass of the train and overcoming air resistance at normal speeds. Maglev does absolutely nothing to reduce either, so the overall power savings aren't much.

The best argument for maglev is probably track maintainance costs. Since the train doesn't even touch the track, there's far less wear.

The only problem is for this effect to be possible currently the magnets would have to be supercooled to support that much weight.


No, they don't. It depends on how you do the maglev - some versions work at normal temperatures.

The biggest problem is probably the cost of building the tracks and trains.

Gerry1of1
Male, 50-59, Western US
 33911 Posts
Friday, December 20, 2013 8:46:12 PM

WHAT!?!

Gerry1of1
Male, 50-59, Western US
 33911 Posts
Friday, December 20, 2013 8:45:29 PM

"I've done trapped my fingers this way. It is serious"

OMG my mind is blown. Is that deep? Is it something I should understand? It is Friday and I've had way too many beers to play with me like that. You "tapped your fingers THIS way" ... WHAT WAY? I must know!

Draculya
Male, 40-49, Asia
 12741 Posts
Friday, December 20, 2013 7:37:00 PM
I've done trapped my fingers this way. It is serious

MrPeabody
Male, 30-39, Eastern US
 1795 Posts
Friday, December 20, 2013 6:39:31 PM
This reminds me of this story: Dirk's Accident (Not for the squeamish)

Evil_Eye
Male, 18-29, Europe
 1451 Posts
Friday, December 20, 2013 6:35:43 PM
@ajd121: Maglev train! Blows my mind every time.

ajd121
Male, 18-29, Eastern US
 602 Posts
Friday, December 20, 2013 4:48:18 PM
The best use for magnets wheni t comes to transportation is having the train hover over the tracks this reduces the friction which requires a a substantially less amount of power to move and get up to speed. The only problem is for this effect to be possible currently the magnets would have to be supercooled to support that much weight.

McGovern1981
Male, 30-39, Eastern US
 13611 Posts
Friday, December 20, 2013 4:01:44 PM
and interfering with things. You could use a magnetic train system in a way but it doesn't help when you're up in space unless you make something most of us can't comprehend at the moment.

McGovern1981
Male, 30-39, Eastern US
 13611 Posts
Friday, December 20, 2013 3:59:01 PM
Surely these forces could be used for propulsion



If you reverse them you can but then you run into a range problems with range.

Mikeoxsbiggg
Male, 30-39, Canada
 1269 Posts
Friday, December 20, 2013 3:56:34 PM
Something about creating a magnetic field to counteract the earths. It was tested then shut down quickly and never developed.

Angilion
Male, 40-49, Europe
 11744 Posts
Friday, December 20, 2013 3:20:25 PM
Surely these forces could be used for propulsion


How? Or more accurately, how could they do so more efficiently than other means of propulsion?

There's maglev, but that's only useful for trains and is still extremely rare even after decades of R&D because it's extremely expensive.

drawman61
Male, 50-59, Europe
 6275 Posts
Friday, December 20, 2013 3:06:08 PM
Surely these forces could be used for propulsion

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