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by blue cobra
December 30th, 2011, 3:53 pm
Forum: 2012 Build Events
Topic: MagLev C [Trial]
Replies: 158
Views: 26744

Re: MagLev C [Trial]

Doesn't Earnshaw's theorem imply that, especially at rest, the car must touch the sides? From experience, in order to move at all the car must fit the track perfectly along the entire run. Therefore I take issue with rule 3.l on the grounds that tracks not only vary from one track to another, but th...
by blue cobra
December 19th, 2011, 5:36 pm
Forum: General Chat
Topic: PSATs
Replies: 95
Views: 7622

Re: PSATs

Here's a nice self-esteem boost for everyone here:

214
CR: 71
M: 77
W: 66

I'm a junior too, this was my first time taking the test, so I have nothing to compare it to. Well, there goes NMS :?
by blue cobra
November 13th, 2011, 9:18 am
Forum: General Chat
Topic: Politics
Replies: 761
Views: 49154

Re: Politics

We can't make everything right in the world. If we continue to try, we'll just destroy ourselves.
by blue cobra
November 6th, 2011, 4:36 pm
Forum: 2012 Lab Events
Topic: Optics B/C
Replies: 559
Views: 59083

Re: Optics B/C

Does anyone know of a good source for a class 2 green laser?
by blue cobra
October 21st, 2011, 2:14 pm
Forum: 2012 Study Events
Topic: Fermi Questions Marathon
Replies: 166
Views: 25661

Re: Fermi Questions Marathon

I'd guess a birthday candle may burn for E2 minutes or so, and I'll call 1000 years about 5E8 minutes, so about 5E6 candles, assuming my assumptions aren't that atrocious.

How many cheeseburgers would you need to make a 1:1 scale replica of a T-rex?
by blue cobra
October 21st, 2011, 10:35 am
Forum: 2012 Build Events
Topic: Robot Arm C
Replies: 531
Views: 57814

Re: Robot Arm C

Was tipping a problem at Nationals? D batteries probably weigh about 150g and the North Goal is nearly the full 70cm away. What was successful for moving the parts of the arm? Is a servo the standard? The arm has to be able to fold up into the 30cm square, so I'd imagine that limits things that woul...
by blue cobra
September 11th, 2011, 6:38 am
Forum: General Chat
Topic: Postgraduate Jobs
Replies: 25
Views: 2759

Re: Postmortem Jobs

Hopefully, I'll become the best Halloween decoration ever.
by blue cobra
September 8th, 2011, 12:48 pm
Forum: Helicopters C
Topic: Designs
Replies: 127
Views: 21140

Re: Designs

What is the definition of "Chinook-style helicopter"? I mean, how will Event Supervisors determine if it is a chinook-style copter? Will it just be common sense, or are there certain guidelines?
I'm thinking something like this.

Which has been done before.
by blue cobra
September 5th, 2011, 12:27 pm
Forum: 2012 Lab Events
Topic: Optics B/C
Replies: 559
Views: 59083

Re: Optics B/C

I understand the Doppler Effect qualitatively, but could someone please help me understand how to do quantitative problems with it? Check out the Wikipedia page: http://en.wikipedia.org/wiki/Doppler_effect It's got some good formulas and links to other sites that let you simulate it. So do we use t...
by blue cobra
September 3rd, 2011, 7:43 pm
Forum: 2012 Lab Events
Topic: Optics B/C
Replies: 559
Views: 59083

Re: Optics B/C

I understand the Doppler Effect qualitatively, but could someone please help me understand how to do quantitative problems with it?

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