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Comment: Where do they get 2.2 hours from? (Score 1) 74

by jgoemat (#47668819) Attached to: Why Hasn't This Asteroid Disintegrated?

The article makes it sound like it doesn't matter what size or mass.

Parameters: Radius 650m, Circumference 4084m, Period 7560s, Speed 0.5157m/s, Mass 2.1e12kg

Calculating Surface Gravity = 0.0003315m/s/s.

Centrifugal Force = 0.00040915m/s/s

While that relates to the orbital speed calculated for the mass and radius of 0.4642m/s, it is far less than the escape velocity of 0.6565m/s. So how far out would it go?

The numbers are so small that if you take the speed they are moving of 0.5157m/s tangental to the surface and point it straight upwards and accelerate it with the gravity of 0.0003315m/s/s then it would come to a stand-still in somewhere over 1600seconds at a height somewhere over 800m and fall back towards the asteroid.

I don't know the maths to figure out the exact values since they vary so greatly with distance, but the difference in centrifugal and gravitational force is only 0.00007765m/s/s. That means that something weighing 100 TONS on earth would have a net upward force of about 1.6 pounds. Of course you can't treat the asteroid as discrete frictionless atoms. What holds a dirt clod together overcoming the full force of earth's gravity to maintain it's shape?

So if you were attached to the surface and dropped a rock it seems to me that it should continue upwards and orbit the asteroid at some altitude. It doesn't surprise me though that since dust can stick to my ceiling and ceiling fan blades even when they're whirring around that this asteroid can stick together.

Comment: What's your definition of skeptical? (Score 1) 441

by jgoemat (#47347133) Attached to: Researchers Claim Wind Turbine Energy Payback In Less Than a Year

Please read the "skeptical" article with a skeptical eye. The poor guy goes through all the work to get the specs and highlights the minimum wind speed rate of 4m/s for the turbines to work. He also links to an excellent page showing wind patters and letting you see wind speed across the country.

But then, he goes off the rails. He can "tell from his own experience" that the wind doesn't always blow that fast and "look at all the blue, which means low wind speed". The big problem is that he didn't go one extra step and actually click on the map to check wind speeds. Almost all of the blue is above the required 4m/s for the turbines. The green is actually too fast. The maximum wind speeds for the turbines are 25m/s and the green areas are over 30.

Poor guy, how embarassing for him. That could have been avoided with a few clicks.

Comment: Re:Sex discrimination. (Score 1) 673

by jgoemat (#46718477) Attached to: Google: Teach Girls Coding, Get $2,500; Teach Boys, Get $0
Go to any programming conference and check the ratio of men to women. Only about 1 in 5 software engineers are women. It's an incentive to get more girls interested in programming. Nowhere are boys barred from the classes or are there penalties for male students. If preference was given to the group that already enjoyed an overwhelming majority then it would certainly be discrimination, but offering an incentive to overcome whatever discrimination must already be occurring to create the gap is not.

Comment: Re:Nah...TL:DR (Score 1) 115

by jgoemat (#46709479) Attached to: Google Chrome 34 Is Out: Responsive Images, Supervised Users

To do this, it makes an extra request to the server before requesting the appropriate image size.

This seems completely wrong, how did it get rated 5-Informative? One of the primary purposes is to use less bandwidth. Responsive images just tells the browser to load a different image based on screen size or pixel density, there's no extra request to the server.

Comment: Re:Poor poor bigot (Score 1) 1116

by jgoemat (#46709339) Attached to: Mozilla CEO Firestorm Likely Violated California Law

Supporting a traditional definition of marriage is not the same as treating people with disrespect

Cognitive dissonance at its finest. Oppressing people is fine as long as they're the ones you think should be oppressed or because oppressing them is traditional?

All you have to do is put yourself in their shoes. If 90% of the country was gay and forbade you from marrying a person of the opposite gender because marriage had always been for same-sex couples, would you feel oppressed? If a gay person's spouse could visit them in the hospital, could claim tax write-offs and could inherit easily from their spouse and make medical decisions for them, but you were denied those things because your marriage was considered nontraditional, would you feel oppressed?

Comment: Re:congrats (Score 1) 135

by jgoemat (#46709123) Attached to: A 2560x1440 VR Headset That's Mobile

A new 27"@2560*1440 costs about US$500 and up.

I got my 27" 2560x1440 monitor on ebay for under $280 (shipped) a few months ago, prices seem to be a little higher now but not that bad. The ~109dpi gives a slightly smoother image also (24" 1080p is ~92 and 30" 2560x1600 is ~100). I hadn't noticed pixelation on my other monitors before but side-by-side it's easy. 4k@28" is overkill dpi-wise unless you're putting your face 6" from the monitor to get that surround feel :)

Comment: What's special about the time? (Score 4, Informative) 99

by jgoemat (#46271051) Attached to: Up-Front Seats For Tonight's Near-Earth Asteroid

Yes it's the closest approach, but it's still going to be 3.2 million km away. If the Earth were the size of a basketball, the asteroid would be 560 feet away and only 1/5 the size of a pixel in an iPhone retina display. The 0.017 arcsecond angular resolution requires a 6.6 meter telescope to see more than just a point of light.. And as for "hurtling past Earth" as some reports say, if it were heading straight for earth at 27,000 miles per hour it would take 73.5 hours or more than 3 days to get here. In our scaled example it would be travelling at a whopping 0.00255 km/h, under 1/10th the speed of a garden snail. The asteroid should have close to the same visibility for many hours around the time of closest approach. Right now (5 hours before) it could at most be 2% smaller through a telescope..

I think it's cool, I just wish the articles wouldn't hype so much and would include more context.

Comment: Antitrust? (Score 2) 378

by jgoemat (#40619215) Attached to: DirecTV Drops Viacom Channels

Of course the real loss there is Nickelodeon.

Of all these channels, the only one I really care about is Comedy Central, but I might watch something on Spike every once in a while. Do you think Viacom would be doing this if we could buy individual channels? They make money from ads which they bombard us with more and more every year. I think Viacom would be happy that their ads are getting to more households. I find it ridiculous that I have to pay for BET Gospel and CMT Pure Country when all I want to watch is South Park.

Comment: Good news for denialists (Score 1) 297

by jgoemat (#39951911) Attached to: Warmest 12-Month Period Recorded In US

At first I was thinking "Great, now denialists will be even more embarrassed about using graphs that only go from 2000 (an unusually warm year) to 2008 (an unusually cool year) to show that the Earth is cooling." Then I realized that in a few years there will be another unusually cool year and they will just start their graphs at 2011 and end on that year.

RADIO SHACK LEVEL II BASIC READY >_

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