## Search found 13 matches

April 4th, 2011, 11:48 am
Forum: 2011 Study Events
Topic: Astronomy C
Replies: 152
Views: 30206

### Re: Astronomy C

What sort of calculations might involve AGNS and quasars? So far all of the questions I've come across for those have been theoretical, no-math questions. Also, same question for spectra; are there any equations for determining what spectral lines would be most prominent in types of stars and if so ...
March 1st, 2011, 9:57 am
Forum: 2011 Lab Events
Topic: Optics B/C
Replies: 513
Views: 65758

### Re: Optics B/C

I have a template that's I'm using to make my measurements during the lasershoot. Am I allowed to leave the template on the Laser Shoot Surface (LSS) during the actual laser shoot (when I fire the laser) or would leaving the template on the LSS be considered modifying the Laser shoot surface (and in...
February 12th, 2011, 8:36 am
Forum: 2011 Study Events
Topic: Astronomy C
Replies: 152
Views: 30206

### Re: Astronomy C

Can anyone tell me how to do these two calculations? A binary star produces the light curve and the radial velocity diagram shown below. Star A has a temperature of 17700 K and a radius of 5RSUN, while star B has a temperature of 11000 K and a radius of 1.5RSUN. The primary eclipse occurs every 3.85...
April 8th, 2010, 7:58 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 58606

### Re: Physics Lab B/C

"Epicfail- You want to have some tilt(angle) in your blades. otherwise, there is no area for the wind to push on in order to turn your fan. Also, for me, a more curving design seems to work better, instead of triangles and squares...[/quote]" Illusionist-- how steep is the curve on your blade? In ot...
April 8th, 2010, 3:56 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 58606

### Re: Physics Lab B/C

I only get 700 mV on high, and I think the problem is the shape of my blades. I use two cardboard blades that have a somewhat gently round protrusion about two thirds of the way out and that is folded to an angle so that it can capture wind. For your design, do you guys use a triangular shaped prope...
April 5th, 2010, 9:13 am
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 123696

### Re: Elevated Bridge B/C

If I have a fairly light bridge (9 grams) and I'm not expecting it to hold all 15 kilos, would it be advantageous to pour the sand in as fast as possible, or would it be better if I poured it in slowly?
March 6th, 2010, 7:55 am
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 123696

### Re: Elevated Bridge B/C

Hmm...when i use Euler's buckling equation: pi^2 * (E) (I) / (K * L)^2, I'm not sure how to calculate the area moment of inertia. My cross section pieces of basswood are under compression and they are placed on the load bearing side, and they are 1/8 in x 1/16 in. Is the modulus of elasticity for ba...
March 5th, 2010, 9:20 pm
Forum: 2010 Build Events
Topic: Elevated Bridge B/C
Replies: 1238
Views: 123696

### Re: Elevated Bridge B/C

Hey do you guys have values for compression and tensile strengths for basswood? (26 lbs per cubic ft density)
Thanks
March 3rd, 2010, 4:17 pm
Forum: 2010 Lab Events
Topic: Physics Lab B/C
Replies: 424
Views: 58606

### Re: Physics Lab B/C

can anyone add a physics lab exam on the test exchange? The one that's on there already from last year isn't challenging enough
March 3rd, 2010, 4:14 pm
Forum: 2010 Study Events
Topic: Astronomy C
Replies: 180
Views: 40041

### Re: Astronomy C

Also, can someone post an exam that tests on all the 2010 DSO's? My team needs some practice problems on DSO's I have a lot of previous exams, but the DSO's change every year, I believe