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/sci/ - Science & Math

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File: 56 KB, 457x835, trolling sci rope world.png [View same] [iqdb] [saucenao] [google]
1817078 No.1817078 [Reply] [Original]

There are two troll pictures that I'm not even sure if they would work IRL.

This one for example. Obviously the rope will fall since nothing is holding it up anymore, but let's assume you attach one end to a pole, then pull the rope all around the world back to the pile and tie the other end to it. What would happen?

>> No.1817080
File: 23 KB, 600x600, trolling sci earth magnet.png [View same] [iqdb] [saucenao] [google]
1817080

And then there's this one. Obviously it wouldn't work exactly like this, but since the Earth IS a magnet (how do they work, anyway) why can't we use its magnetic field to generate electricity?

>> No.1817095

earth doesnt rotate on the right axis to generate electricity. you need to be able to flip from North and South poles

>> No.1817102

the rope would ultimately fall at some point due to loss of energy

>> No.1817118
File: 11 KB, 684x535, untitled.png [View same] [iqdb] [saucenao] [google]
1817118

>>1817078
Protip: the rope would contact the Earth as you pulled it.

>> No.1817125

>>1817095
- Actually, this could work, buuuut...
- There's a catch?
- There's always a catch...

Never mind the two brushes not being on the right axis or the fact we need coil, not brushes (those are AC motor commutators), the greater problem is Lenz's Law: the magnetic field of the induced current always acts in opposition to the field generating it.

Hence, while this would generate pseudo-free energy, it would do so at the cost of eventually stopping the planet's rotation.

>> No.1817129

>>1817125
>never mind the brushes completely fucking destroying everything near the equator

>> No.1817134

>>1817129
there is nothing of importance at the equator

>> No.1817146

>>1817134
Except for a couple of launch sites, since the easiest is launching from the equator, due to the marginally, but importantly greater tangential velocity of the launched object.

>> No.1817230

>why can't we use its magnetic field to generate electricity?
you can.
I recall an experiment in which the space station got a big metal rope and stretched it out in space. Since they were moving so fast, the magnetic field was changing, and generated a current.
The current was actually so strong, that it generated a spark that burned through the wire.

>> No.1817302

>>1817230
>metal rope

lolwut?

Also, that sounds interesting and I'd like a source if you have it.