Search found 340 matches

by Seraph
Tue Mar 01, 2016 3:48 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1649: "Pipelines"
Replies: 91
Views: 15480

Re: 1649: "Pipelines"

The flow rate assumption seems like an awfully big one. Could someone clarify: Is the upper chart "actual size" or the lower one? Unless your computer screen is very large, or you are very small, the person in the lower chart is not anything like "actual size"... Some quick work...
by Seraph
Thu Sep 03, 2015 1:44 am UTC
Forum: Individual XKCD Comic Threads
Topic: 1572: "xkcd Survey"
Replies: 366
Views: 116245

Re: 1572: "xkcd Survey"

So, did anyone else accidentally submit the form whilst mashing the keyboard for that one question? Yup. I closed my browser tab. Also I HATE the question "On a scale of 1 to 10, how good at spelling are you?" Is 1 good, or is 10 good? It's it like starts, or is it a ranking? Who knows. I...
by Seraph
Sun May 24, 2015 1:39 am UTC
Forum: Science
Topic: Bladeless Wind Turbine: Do joints look better than fans?
Replies: 17
Views: 3303

Re: Bladeless Wind Turbine: Do joints look better than fans?

I really like that they're safer for birds, which is a big problem with California's wind turbines. It's really not. Note it's a log scale... http://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Bird_mortality.svg/1920px-Bird_mortality.svg.png http://en.wikipedia.org/wiki/Environmental_impact_o...
by Seraph
Sun Feb 01, 2015 3:16 am UTC
Forum: Science
Topic: How long can we (human society) survive global warming?
Replies: 67
Views: 11911

Re: How long can we (human society) survive global warming?

We're in an ice age right now. So somehow going from the state we're in right now, to the state we're in right now would knock our population down by almost 6 orders of magnitude?
by Seraph
Mon Dec 22, 2014 5:21 pm UTC
Forum: What If?
Topic: What-If 0122: "Lava Lamp"
Replies: 34
Views: 14007

Re: What-If 0122: "Lava Lamp"

Do people actually ever read the links Randall posts (aside from videos, though you don't read them, so yeah)? When he stated on footnote (is that how they're called? IDK) #8 that 45% of manmade emissions came from gold mining, I just found it so ridiculous I had to check for myself. Truth be told,...
by Seraph
Wed Nov 26, 2014 7:14 pm UTC
Forum: Science
Topic: Oscilloscope Stray Signals
Replies: 36
Views: 9046

Re: Oscilloscope Stray Signals

Oh this is a real scope probe, not a banana (why all the nanas lol) cable. I'm just a hobbyist, really, and I don't do as much with electronics as I used to. I lost my touch with it. The BNC thing seems unnecessary at the moment, but I guess I should build a 555 test circuit just to see how accurat...
by Seraph
Fri Oct 24, 2014 6:06 pm UTC
Forum: News & Articles
Topic: Ebola thread
Replies: 256
Views: 57156

Re: Ebola thread

EMTP wrote:Ebola as a health threat to Americans *is* a joke. Two Seven Americans have caught it. For those keeping score at home, that's 1/150,000,000 1/42,000,000. Both the Americans who caught it are fine. There have been no new cases for over a week There was a new case recently.

FTFY
by Seraph
Wed Oct 01, 2014 5:25 pm UTC
Forum: Science
Topic: Smallest animal
Replies: 18
Views: 5947

Re: Smallest animal

I don't know about smallest animal, but Wikipedia claims this thing is the smallest insect.

Edit: http://en.wikipedia.org/wiki/Smallest_organisms#Animals
by Seraph
Thu Jun 19, 2014 6:10 pm UTC
Forum: Science
Topic: Finding the source of a viral pandemic to develop a vaccine
Replies: 17
Views: 3008

Re: Finding the source of a viral pandemic to develop a vacc

Well, I suppose if you could find "patient zero" then that person might contain a version of the virus that didn't cause zombification. Said non-zombification virus could then be used to make a vaccine, sort of how small pox vaccine is made with cow pox.
by Seraph
Thu Mar 27, 2014 4:49 pm UTC
Forum: Science
Topic: Rate of Entropy
Replies: 18
Views: 4136

Re: Rate of Entropy

We don't do it to emulate anything, and there's really nothing *to* do well. We're not doing it to accomplish some goal, we're doing it so we can have a bit of fun from time to time. But don't you worry your pretty little head about it, we'll probably just go ahead and ban you for the duration, sin...
by Seraph
Mon Mar 03, 2014 5:57 pm UTC
Forum: Hardware
Topic: Laptop/phone's headphone jack as a DAC
Replies: 8
Views: 6152

Re: Laptop/phone's headphone jack as a DAC

How much current do you need? That makes a big difference for DAC operations. I can think of a few easy ways to do this with the Arduino that you seem to be overlooking: 1) Use an SPI DAC that is controlled by your Arduino 2) Use and R-2R resistor network - Variations on this theme follow: 2a) Use a...
by Seraph
Tue Jan 21, 2014 10:47 pm UTC
Forum: Science
Topic: Thevenin/Norton circuit analysis
Replies: 3
Views: 1702

Re: Thevenin/Norton circuit analysis

You need to look for easy to solve two-terminal networks. I'd say that for this problem that would be R1 and R6. Lets start with R6+I3. You know the current and resistance, so you should be able to replace it with a voltage source. (i.e. what is the voltage across R6 / what is the voltage at the R4/...
by Seraph
Wed Sep 11, 2013 3:26 pm UTC
Forum: News & Articles
Topic: Charter of Quebec Values Unveiled
Replies: 16
Views: 2812

Re: Charter of Quebec Values Unveiled

Chen wrote:How is an elected official NOT a public servant? I mean come on now.

Public servants are selected/promoted based on how well they do their jobs, while elected officials are selected based on the seemingly arbitrary will of their constituents?
by Seraph
Wed Sep 11, 2013 3:25 pm UTC
Forum: General
Topic: Say you have a time machine...
Replies: 53
Views: 19851

Re: Say you have a time machine...

Tomlidich got me thinking. Maybe it's just because I'm a jerk, but it seems like it would be more fun to insert more uncertainty into things. For example, go back to the Kennedy assassination and stand suspiciously on the grassy knoll.
by Seraph
Mon Aug 26, 2013 9:14 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1256: "Questions"
Replies: 215
Views: 38516

Re: 1256: "Questions"

2. Why aren't bullets sharp? Same reason the noses of dolphins, airliners, torpedoes, and the fastest submarines are also rounded instead of sharp. The physics of moving a solid object through a fluid (air or water) at high speeds work out that the right rounded shape goes faster with less energy (...
by Seraph
Sun Jun 23, 2013 6:12 pm UTC
Forum: Hardware
Topic: I just bought a thousand npn transistors on ebay.
Replies: 12
Views: 10603

Re: I just bought a thousand npn transistors on ebay.

I'm going to make several suggestions. 1) Think about investing in some LEDs. If I were doing something like this I would enjoy being able to see what the contents of my registers were, and perhaps an indication of what instruction was currently being run. Would make a nice demonstration piece for t...
by Seraph
Fri Apr 26, 2013 5:15 pm UTC
Forum: Science
Topic: Proteins
Replies: 5
Views: 1209

Re: Proteins

I believe content is determined by measuring nitrogen content. The nitrogen content is then multiplied by a constant to arrive at a protein content. The same process is also used for pet/animal food and was the idea behind the Melamine (C3H6N6) scares 5 years ago that lead to the the 2007 pet food r...
by Seraph
Thu Apr 11, 2013 4:27 pm UTC
Forum: Science
Topic: Designing a (Totally) self sufficient Mars colony
Replies: 245
Views: 36685

Re: Designing a (Totally) self sufficient Mars colony

Since solar or wind power are pretty much out, it seems we'd have to stick with nuclear at this point. Wind is one of the few resources that Mars has in abundance, in fact. Although it's probably a "too much of a good thing" situation in this case. Mars may have high wind speeds, but woul...
by Seraph
Wed Nov 21, 2012 8:38 pm UTC
Forum: Science
Topic: Gauge Pressure and Bullets
Replies: 7
Views: 2001

Re: Gauge Pressure and Bullets

I have no idea where 2k2 f/s came from. Anyways, my box says 1560 f/s. According to "lasc(dot)us/SAAMIMaxPressure(dot)htm", the only 22 on there is a hand gun. The closest thing in the list is a 222 Remington with a barrel pressure of 50,000 PSI. Scratch that. I just saw this: "22-25...
by Seraph
Tue Nov 06, 2012 2:13 am UTC
Forum: Hardware
Topic: Best way to "upgrade" SSD capacity
Replies: 14
Views: 5769

Re: Best way to "upgrade" SSD capacity

If I were doing this and really wanted it to look like one drive, I would try a SPAN (concatenation) setup (called JBOD in most of the systems I've dealt with) instead of a RAID. That said, if I were doing this I'd also want to make sure that TRIM would be properly supported in whatever configuratio...
by Seraph
Fri Nov 02, 2012 4:46 am UTC
Forum: Science
Topic: Wheels and Friction
Replies: 8
Views: 1828

Re: Wheels and Friction

I think rolling resistance is going to be the big issue here, because like Dopefish I would expect the friction considerations to balance out. For solid wheels I believe that four wheels will have more rolling resistance then two wheels. Doubling the per-wheel load by going from four wheels to two w...
by Seraph
Thu Aug 23, 2012 7:15 pm UTC
Forum: Science
Topic: Billiard balls - where does the energy go?
Replies: 25
Views: 5189

Re: Billiard balls - where does the energy go?

Billiard balls also have (to some extent) the problem of spin, similar to the cans experiment, at least if you roll them towards each other. This is worth calling out. When you're dealing with billiard balls you have to take into account where in the ball the contact takes place, that's how you put...
by Seraph
Fri Jul 13, 2012 6:36 pm UTC
Forum: News & Articles
Topic: Paramedics turn to expired drugs due to shortages
Replies: 51
Views: 6705

Re: Paramedics turn to expired drugs due to shortages

I'm not sure this is really an issue. The government has required expiration dates on drugs since the late 70's, and may expiration dates are set to one year. In the vast majority of cases drugs will remain perfectly good WAY past their expiration date. The FDA did a study a while back testing drugs...
by Seraph
Wed Jun 06, 2012 2:21 pm UTC
Forum: News & Articles
Topic: Woman falsely accuses man of rape, admits it 5 years later
Replies: 184
Views: 21109

Re: Woman falsely accuses man of rape, admits it 5 years lat

Like I said, if you plan on killing A, but you miss the shot and hit B instead, it's still premeditated murder. I'm not sure if you're arguing this based on the reality of some screwed up legal system, or based on how the law is supposed to work, but if it's the latter then that's just wrong. It'd ...
by Seraph
Wed May 09, 2012 11:08 pm UTC
Forum: Science
Topic: Bioreactor pump
Replies: 9
Views: 5660

Re: Bioreactor pump

Do you have a price range? My solution to a problem like this would be a peristaltic pump Expensive but precise: http://www.masterflex.com/Product/Masterflex_small_sup_reg_sup_small_L_S_small_sup_reg_sup_small_Digital_Pump_System_with_Easy_Load_small_sup_reg_sup_small_II_Pump_Head_600_RPM_115_230_VA...
by Seraph
Thu May 03, 2012 12:20 am UTC
Forum: Science
Topic: neutron moderators
Replies: 9
Views: 2518

Re: neutron moderators

Wouldn't the hydrocarbons fall apart (or polymerize, or something else equally unpleasant) under the bombardment of ionizing radiation they'd be exposed to?
by Seraph
Sat Apr 28, 2012 5:49 pm UTC
Forum: Science
Topic: [Physics] [homework] The static friction coefficient (μs)
Replies: 5
Views: 3047

Re: [Physics] [homework] The static friction coefficient (μ

Draw the free body diagram for object A, and then solve for the forces. There are three forces. 1) The force of gravity on object A. (you have this) 2) The force of block 'B' pushing block 'A' to the right. (use F=ma a few times) 3) The force of friction between block 'B' and block 'A'. (I assume yo...
by Seraph
Thu Apr 26, 2012 11:52 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1047: "Approximations"
Replies: 159
Views: 63841

Re: 1047: "Approximations"

by Seraph
Thu Apr 26, 2012 7:59 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 1047: "Approximations"
Replies: 159
Views: 63841

Re: 1047: "Approximations"

The first post on this one should be edited to include the unique Header text: Lots of emails mention the physicist favorite, 1 year = pi x 107 seconds. 75^4 is a hair more accurate, but it's hard to top 3,141,592's elegance. The header on the comic page bothers me. First a trivial math error: 3,14...
by Seraph
Mon Mar 26, 2012 3:13 pm UTC
Forum: News & Articles
Topic: Woman beaten to death (probably for wearing a hijab) in US.
Replies: 27
Views: 10347

Re: Woman beaten to death (probably for wearing a hijab) in

sourmìlk wrote:whereas this is irrefutably and unquestionably a blatant hate crime.

Because someone who was willing to murder a woman would never stoop to writing a fake note in an attempt to throw off the police?
by Seraph
Mon Mar 12, 2012 8:03 pm UTC
Forum: Science
Topic: Why do airplanes need wings?
Replies: 66
Views: 11898

Re: Why do airplanes need wings?

Isn't the answer to this question the fact that kinetic energy is proportional to velocity squared? My understaning is that in order to stay airborne over a given period of time you need to transfer a certain amount of momentum to the air (i.e. to maintain flight at any particular instant you need t...
by Seraph
Thu Mar 01, 2012 7:10 pm UTC
Forum: Hardware
Topic: How does an auto tach work?
Replies: 7
Views: 7436

Re: How does an auto tach work?

I believe that LikwidCirkel was correct, it's just a low pass filtering of voltage swings of the low side of the coil. In particular I suspect your assumption that the "duty cycle is constant" isn't correct. Rather I would suspect that the spark takes a specific amount of time, so if it's ...
by Seraph
Wed Feb 22, 2012 1:49 am UTC
Forum: News & Articles
Topic: Choose-your-adventure, Greek Debt Crisis edition
Replies: 30
Views: 4386

Re: Choose-your-adventure, Greek Debt Crisis edition

Also, to anyone who holds the notion that you can just retire and live off state pension, you need to be slapped. In most countries, the state pension will barely get you by and will most certainly not covered for the luxuries you're accustomed to. Greece isn't "most countries". The fact ...
by Seraph
Wed Feb 08, 2012 2:06 am UTC
Forum: Hardware
Topic: When did they start making hard-drive platters out of glass?
Replies: 3
Views: 5176

Re: When did they start making hard-drive platters out of gl

IBM started putting them in consumer hard drives in or around 2000, and they were available in SCSI drives back in the 90's. After a brief search I managed to find an article in Infoworld back in 1989 talking about how glass hard drive patters were possible in the future. That said, desktop hard dri...
by Seraph
Wed Feb 01, 2012 11:10 pm UTC
Forum: Mathematics
Topic: Tractor Tire Dead Lift Problem
Replies: 9
Views: 2586

Re: Tractor Tire Dead Lift Problem

*it is sufficient to have the center of mass in the center of the tire - which is a very good idea for tires. I would just point out that it's fairly common for those big tractor tires to have a liquid ballast in them (i.e. be partially filled with a calcium chloride solution). This would break the...
by Seraph
Wed Jan 04, 2012 2:29 pm UTC
Forum: News & Articles
Topic: U.S. Republican Primary
Replies: 2855
Views: 275552

Re: U.S. Republican Primary

Mitt may have gotten the most votes, but I would say that Santorum is really the "winner" in Iowa. He basically went from politically dead to viable candidate in a day. In addition there is a good chance of Perry and Bachmann dropping out, and a good number of their supporters are likely t...
by Seraph
Wed Oct 19, 2011 5:17 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0966: "Jet Fuel"
Replies: 168
Views: 36327

Re: 0966: "Jet Fuel"

This isn't to say that there's always going to be prominent, mainstream news coverage and widespread outrage over the issue, the press does pick it's battles. But, there will be some sort of reasonably public and passably objective coverage. Really? Is that why Operation Northwoods , a US plan for ...
by Seraph
Tue Oct 18, 2011 2:33 am UTC
Forum: General
Topic: Take ALL the engineering class surveys!
Replies: 16
Views: 2880

Re: take a survey for my engineering class?

I took the survey. My only comment is that 50k seems pretty big for a major stadium. For example it eliminates all but a handful of Major League Baseball parks.
by Seraph
Mon Oct 03, 2011 9:47 pm UTC
Forum: News & Articles
Topic: D.I.Y. Steaks in Afghanistan: $10,000
Replies: 24
Views: 3290

Re: D.I.Y. Steaks in Afghanistan: $10,000

Why doesn't the army buy more stuff from the locals anyway? Buying that cow would probably have been cheaper than shipping in the calories in military rations from wherever, AND it's better for their relations with the locals. Not to mention better for the economy, which I would think would lead to...
by Seraph
Thu Sep 29, 2011 8:45 pm UTC
Forum: News & Articles
Topic: Contracting Out Gov't Work Costs More
Replies: 28
Views: 4007

Re: Contracting Out Gov't Work Costs More

No. We don't actually know if contracting saves money, because the new study left out how much the government is paying in overhead. Heritage: Contractor salary < Government salary POGO: Contractor salary + Contractor benefits + Contractor profits > Government salary Neither study tells us which wa...

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