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The molecular thread used is consist of a single long super dense compound with extremely fast angular momentum (referring to its quantum property) at nearly the speed of light. This filament less than 1 nm thick is shown to sever any molecular bonds upon contact with almost no resistance, how to effectively block against such weapon if possible using modern day innovation?

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closed as primarily opinion-based by Aify, Hohmannfan, Separatrix, Burki, Mołot Sep 29 '16 at 9:05

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ By using the same technology that lets you reach those insane specifications? $\endgroup$ – Cort Ammon Sep 29 '16 at 1:04
  • $\begingroup$ @Cort Ammon: sorry I forgot to include the tech level just now, and I dislike the idea of self defeating. $\endgroup$ – user6760 Sep 29 '16 at 1:09
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    $\begingroup$ @user6760 How does it have infinite angular momentum?? Angular momentum is M*V * D (mass) (angular velocity) (distance from center of rotation) The mass is very small. The distance is at most a few dozen meters. The man waving it around can't move his hand faster then a few dozen meters / second) $\endgroup$ – sdrawkcabdear Sep 29 '16 at 1:30
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    $\begingroup$ Actually the angular momentum refers to the individual molecule because I want it to sound cool, that's all. $\endgroup$ – user6760 Sep 29 '16 at 1:51
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    $\begingroup$ @user6760 be careful when trying to sound cool. It can backfire pretty spectacularly. In this case, you have a grave dimensionality error, because the units of angular momentum are not the same as the units of the speed of light. That then draws extra attention to your use of the speed of light, which really doesn't belong anywhere near hand-to-hand-combat. Momentum is also the one thing you don't want to draw attention to in a monoblade, because you shouldn't have to rely on momentum in any way shape or form for that particular science fiction weapon. $\endgroup$ – Cort Ammon Sep 29 '16 at 2:04
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I would probably punch the guy who is wielding it.

We get a lot of questions on StackExchange in the form of "unstoppable forces" or "immovable objects," and then the request is to brainstorm solutions. Typically these solutions are given limitations well below the technology or magic used to create the unstoppable force or immovable object. In this case, no physics is provided for the monoblade, so it's all handwavium. This means there's no weaknesses in the implementation for us to explore.

A few potential solutions:

  • Capture the filament with electrostatic forces.
  • Burn the filament with plasma.
  • If the filament is conductive, you might be able to use a tesla coil to zap the guy.
  • Block the blade at the hilt, rather than at the pointy bit.
  • Be elsewhere (not technically blocking, but not a bad idea any time someone comes at you with technology Clarke would call "magic")
  • Set off a nuclear device near the monoblade (which has the convenient side effect of also ensuring the wielder stops wielding any blades)
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    $\begingroup$ As always, there's a tangentially related xkcd comic to this: xkcd.com/538 $\endgroup$ – user6511 Sep 29 '16 at 4:05
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Shoot him

enter image description here

A sword can only reach so far of course...

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Use your own mono-blade to parry your opponent's mono-blade. Of course you would, if your opponent has a mono-blade, then surely you do too.

The OP didn't specify how super-dense the mono-blade might be, so the chances are your opponent will be struggling to even lift his mono-blade because it is too heavy to lift. In that case, follow Cort Ammon's advice and punch him.

Alternatively, you run him through with a non-super-dense conventional blade or shoot Mr Mono-blade with an ordinary gun. If you're really lucky he will die of a heart attack trying to lift his too heavy, super-dense mono-blade.

Basically remarkably few modern innovations are needed to stop someone armed with a super-dense mono-blade. Conventional weapons are more than adequate at combating persons armed with swords. This is only sword, admittedly it does have the Rule of Cool on its side, but the sad truth is the Rule of Cool never saved anyone's life. A sword by any other name is still a sword.

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  • $\begingroup$ As a courtesy could the downvoter give reasons for doing so. If my answer needs improvement, I'd certainly like to know what is the problem. I'm sure you like same courtesy with regards your answers too. $\endgroup$ – a4android Sep 30 '16 at 7:44
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I will take block to mean "stop him from hitting more people with his fancy sword."

Meaning kill the wielder with basic weapons

Kamikaze

You can't block his sword and he can't block you either. You swing an axe at him he "blocks" it by cutting through it. The cut off segment keeps going and hits him. So he can always hit you and you can always hit him, just rush three guys at him kill him and take the sword.

Shoot him if he "blocks" the bullet / arrow it will hit him.

The monomolecular weapon may not even harm a human. IF it cuts a very sharp cut with a very thin blade (monomolecual) and moves very fast (the term used was infinite angular momentum which is impossible, but assume fast) the bonds may reseal on the other side with out the loss of blood of damage to the organs. It may be true he cuts you dozens of times to no effect at all.

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  • $\begingroup$ if the blade is blade shaped (not a mono pin) then slight twitches in the angle of the slice could separate the molecules. $\endgroup$ – Sarfaraaz Sep 29 '16 at 6:55
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How to counter an unstoppable sword? Why, with an invulnerable shield of course.

Do you have magnetic shields (aka 'force' fields) available? There're some ideas around already: http://www.popularmechanics.com/military/research/a14683/boeing-patent-plasma-shield/

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Have you tried diplomacy? :-)

Just kidding. More seriously: what's the melting point of this monofilament? Perhaps it can be "parried" by a flame thrower or hyper-focused laser. Similarly, maybe extreme cold makes it brittle.

Alternate: What is its sliding friction coefficient? As it slices through objects, it is going to lose energy and slow down. There is some thickness that will stop it unless it is being actively propelled -- that thickness might be a planet or it might be a thick brick of uranium, depending upon the coefficient.

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