Search found 17 matches

by WIMP
Wed Aug 28, 2013 2:37 am UTC
Forum: What If?
Topic: What-if 0060: "Signs of Life"
Replies: 71
Views: 40596

Re: What-if 0060: "Signs of Life"

or just pull out a geiger counter—there should still be (relatively) short-lived stuff from atmospheric nuke testing in the 50’s and 60’s detectable everywhere Can you distinguish that from naturally occuring (background) radiation? hmm, geiger counter may have been an exaggeration—you may need a G...
by WIMP
Wed Aug 14, 2013 12:22 pm UTC
Forum: What If?
Topic: What-If 0058: "Orbital Speed"
Replies: 106
Views: 70289

Re: What-If 0058: "Orbital Speed"

I don't understand this. Geostationary satellites orbit at the same speed the earth revolves. So if you launch one of them, why would you need to gain any speed in addition to the speed you already have from being on the surface of the earth? The Earth spins at something like 1000 miles/hr at the e...
by WIMP
Tue Dec 11, 2012 3:47 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1145: "Sky Color"
Replies: 211
Views: 71151

Re: 1145: "Sky Color"

The asymmetry of parity is one of the more unsettling parts of physics, because it's extremely unintuitive. It's not as well known, but as strange as relativity, but it's even harder to prove to a layman, I believe. BTW, I am such a layman. I have absolutely no idea how it is possible, I just know ...
by WIMP
Mon Dec 10, 2012 5:46 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1145: "Sky Color"
Replies: 211
Views: 71151

Re: 1145: "Sky Color"

I suspect the answer to part 1 is a combination of the sun's output and the human eye's receptors being strongly biased towards blue relative to violet, so that even a much stronger reflection of violet isn't sufficient to beat blue. Planck's Law falls off very rapidly past the wavelength peak, and ...
by WIMP
Fri Nov 16, 2012 8:27 pm UTC
Forum: What If?
Topic: What-If 0020: "Diamond"
Replies: 75
Views: 36129

Re: What-If 0020: Diamond

Now that I think about it, 100 ft is less than the Schwarzchild of the sun, so would this be a black hole? No, because in its rest frame the diamond still just weighs as much as it did before. By this argument, you could make absolutely anything into a black hole by moving fast enough relative to i...
by WIMP
Wed Nov 14, 2012 6:12 am UTC
Forum: What If?
Topic: What-If 0020: "Diamond"
Replies: 75
Views: 36129

Re: What-If 0020: Diamond

Now that I think about it, 100 ft is less than the Schwarzchild of the sun, so would this be a black hole? No, because in its rest frame the diamond still just weighs as much as it did before. By this argument, you could make absolutely anything into a black hole by moving fast enough relative to i...
by WIMP
Wed Nov 14, 2012 6:09 am UTC
Forum: What If?
Topic: What-If 0020: "Diamond"
Replies: 75
Views: 36129

Re: What-If 0020: Diamond

gmalivuk wrote:In a reference frame moving half the velocity of the diamond sphere, these collisions are head-on as well.


Right, and the diamond has lost enough of its energy (and the air molecules are not making up the difference) that the collisions are less energetic than those of the LHC.
by WIMP
Wed Nov 14, 2012 1:07 am UTC
Forum: What If?
Topic: What-If 0020: "Diamond"
Replies: 75
Views: 36129

Re: What-If 0020: Diamond

At this speed, every carbon molecule carries 25 TeV of energy, c.omparable to particles in the beam of the Large Hadron Collider. This isn't quite right. The maximal energy of the LHC is 14 TeV for both beams, so 7 TeV per beam. And not per particle! Those have less. A little faster, and we might s...
by WIMP
Tue Nov 13, 2012 4:29 pm UTC
Forum: What If?
Topic: What-If 0020: "Diamond"
Replies: 75
Views: 36129

Re: What-If 0020: Diamond

A baseball traveling at 0.9c fuses with air molecules. A 100 foot wide diamond traveling at 0.99c has no bonds and the particles are moving to fast to fuse with air molecules. I honestly don't care enough to research this any further. I'm just saying that they seem to be contradictory. I think he l...
by WIMP
Fri Nov 09, 2012 6:38 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1131: "Math"
Replies: 156
Views: 33081

Re: 1131: "Math"

Isn't this comic in error? It shows the "result" as being directly in the middle of the forecasted range. However, as best I can tell, Obama won every single swing state. Didn't he perform at the absolute maximum of what was forecasted as possible? If not, what states specifically did he ...
by WIMP
Sun Oct 28, 2012 1:44 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1123: "The Universal Label"
Replies: 114
Views: 23613

Re: 1123: "The Universal Label"

Given that Neutrinos do not attract/repel through the Electromagnetic or Strong Nuclear forces, and that they only collide with the (much larger than themselves) atomic nuclei at a rate of something like one per several tons of solid matter per year (i.e. one collision per year for approximately 10...
by WIMP
Wed Oct 24, 2012 11:32 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1123: "The Universal Label"
Replies: 114
Views: 23613

Re: 1123: "The Universal Label"

Question: Is the equal production of matter and antimatter strictly guaranteed by the laws responsible for it, or is it merely a statistical thing? E.g. is it possible to condense a bunch of energy into just an electron or positron, but on average a volume of high energy density will condense into ...
by WIMP
Sat Oct 20, 2012 6:10 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1123: "The Universal Label"
Replies: 114
Views: 23613

Re: 1123: "The Universal Label"

Question: Is the equal production of matter and antimatter strictly guaranteed by the laws responsible for it, or is it merely a statistical thing? E.g. is it possible to condense a bunch of energy into just an electron or positron, but on average a volume of high energy density will condense into ...
by WIMP
Fri Sep 07, 2012 4:38 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1105: "License Plate"
Replies: 91
Views: 31368

Re: 1105: "License Plate"

I don't get the title text. Can anyone explain it please? The girl he talked to got a similar but not identical plate of 1s and Is, indistinguishable from the guy's, waited for the guy to get notorious for having that style of plate, then committed crimes using that plate for her getaway car. The w...
by WIMP
Mon Aug 13, 2012 2:52 pm UTC
Forum: What If?
Topic: What-If 0001: "Relativistic Baseball"
Replies: 167
Views: 126078

Re: What-If 0001: Relativistic Baseball

The baseball has roughly 11 moles of carbon (6.6*10^13 more stuff) in a 7.5cm diameter (21 million times bigger). Air is roughly 1000 times less dense than a baseball. Rough calculations means for each 7.5cm of air the baseball passes through, we have about 6000 nuclei-nuclei collisions. A concrete...
by WIMP
Sat Jul 14, 2012 1:06 am UTC
Forum: What If?
Topic: What-If 0001: "Relativistic Baseball"
Replies: 167
Views: 126078

Re: What-If 0001: Relativistic Baseball

It is most appropriate to view this collision as between a group of moving nuclei and, in collider lingo, "fixed target" nuclei, of similar composition (nitrogen, oxygen, carbon). The chemical bonds are irrelevant; the electrons have much less energy. For analysis purposes, let us go into ...
by WIMP
Wed May 25, 2011 7:00 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0903: "Extended Mind"
Replies: 666
Views: 186746

Re: 0903: "Extended Mind"

Usually get into an infinite loop at knowledge. Very promising in terms of proximity to philosophy, however.

Go to advanced search