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Matthew Thornhill
Lives in Nashville, TN
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So much yes.
h/t +Evelyn Pearson
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Matthew Thornhill

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This is awesome, vocabulary by artist.
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Poets....
Literary elites love to rep Shakespeare's vocabulary: across his entire corpus, he uses 28829 words, suggesting he knew over 100000 words and arguably had the largest vocabulary, ever. I decided to compare this data point against the most famous artists in hip hop. I used each artist's first ...
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Get better indoor air and make your space look nicer too! This graphic guide, built with a little help from +NASA, will help you pick the best plants for the job. 

Click enlarge on the graphic to see it full-size, or head here for more:  http://lifehacker.com/this-graphic-shows-the-best-air-cleaning-plants-accord-1705307836 
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You can shut it all down now, this wins the internet.
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Very, very cool! 
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Haha, he missed!
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<3 kickstarter.
 
Flying through space, powered by sunlight

Yesterday a rocket launched from Cape Canaveral in Florida carrying the LightSail into space!  It's a small spacecraft with a big shiny screen that's pushed by the light of the sun.  

It's just a test - it won't go far.   It will fall to the Earth and burn up.  But next year there will be a more serious test.

One cool thing is that all this is being paid for private donations, by a Kickstarter campaign!

The LightSail is carried to space in a cute little CubeSat.  It looks like a big toaster, and it weighs just 10 kilograms.   But holds a sail 32 square meters in area,  made of a shiny plastic called mylar, just 4.5 microns thick.  This unfolds in a clever way - watch the movie! - to form a big square.

The Sun will push on this with a tiny force. 

Puzzle: How tiny is this force?

Someone named Bill Russell answered this over on Yahoo.  Let me go through his calculation so we can check it.

The momentum of light is given by

p = E/c

where E is the energy of the light, p is the momentum, and c is the speed of light. 

In outer space near earth the sunlight provides 1370 watts per square meter - that's energy per area per time.  We can use the formula above to convert this to momentum per area per time, better known as force per area... or pressure

Russell calculates

(1370 watts / meter²) / c = 9.13 micronewtons / meter²

and concludes the pressure is 9.13 micronewtons per square meter.  His arithmetic checks out, but I think he's neglecting some physics: when the light bounces back off the mirror its momentum completely reverses, so I think we get an extra factor of 2. 

Puzzle 2:  Am I right or am I wrong?

The area of the LightSail is about 32 square meters.  Russell says this gives a total force of

9.13 micronewtons/meter² x 32 meter²

or about 300 micronewtons.   I'd double this and get 600 micronewtons.

Puzzle 3: Once it's out of the box, the LightSail weighs about 4.5 kilograms.  How much will it accelerate due to sunlight?

Here we use Newton's good old

F = ma

and solve for the acceleration a.   But at this point Russell seems to make a serious mistake.  I'll let you see what you think, and fix it if necessary!  Here is his calculation:

https://answers.yahoo.com/question/index?qid=20121212091408AA3D606
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SAIL!
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Work
Occupation
Lead software engineer
Skills
C#, LINQ, EF6, Prism
Employment
  • Lead software engineer, 2013 - present
    I'm an architect. I get to say that now because it's true.
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Gender
Male
Story
Tagline
I'm the doctor!
Bragging rights
Lived all over the US, wrote first program at 11
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Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Nashville, TN
Previously
AL, AZ, CA, HI, MS, PA, TN
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This place is amazing. The food is most excellent, the live music is usually pretty good (when they have it) and the environment is relaxed and family friendly.
Public - 2 months ago
reviewed 2 months ago
Thanks to Steve Burris at this location, I'm now the pleased owner of a 2014 Prius. Steve was knowledgeable and not pushy (which I would have walked away from) and helped me find the right car with exactly the features I wanted. This dealership is head-and-shoulders above the average "pump and dump" shop you come across when looking for a car. If you want to find a great vehicle at a great price with outstanding support (lifetime roadside assistance in Nashville anyone?), go here and ask for Steve.
• • •
Public - a year ago
reviewed a year ago
2 reviews
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