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by alpacas
April 26th, 2014, 6:22 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

Looking back actually I'm not sure (but trying to figure it out that number must have come from somewhere) because distance modulus suggests that it would be D~2000 LY=613.5 pc and with m=16 (http://en.wikipedia.org/wiki/NGC_3132) absolute magnitude would be 7, which is obviously really different al...
by alpacas
December 30th, 2013, 8:51 pm
Forum: 2014 Study Events
Topic: Simple Machines B/Compound Machines C
Replies: 196
Views: 70828

Re: Simple Machines B/Compound Machines C

Hi C Division competitors (and B I suppose could also discuss this) what is the accuracy of your machine so far? Either in grams or percent error, whichever is more consistent- I was kind of envisioning a running discussion like past score threads of boomilevers and other build devices.
by alpacas
October 18th, 2013, 10:02 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

Astronomers have calculated the lower limit for the mass of the black hole GRS 1915+105 given that the velocity amplitude of the mass donator star is 140±15 km/s. Please find this lower limit and show work thank you!
by alpacas
October 16th, 2013, 10:08 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

[img]http://i39.tinypic.com/ydif7.png[/img]
*edit to be entirely honest I'm not sure what you meant by "prove"
by alpacas
October 15th, 2013, 10:20 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

answer|the progenitor star of Abell 30 originally went through thermonuclear explansion 12,500 years ago and shed its outer layers, then 850 years ago the progenitor star was essentially reborn and re-shed He and C layers after nuclear reactions and such brought enough nebulous material back to the...
by alpacas
October 6th, 2013, 3:41 pm
Forum: 2014 Build Events
Topic: Mission Possible C
Replies: 554
Views: 110571

Re: Mission Possible C

I think in the past that example of forming the precipitate has been counted for CHEM-EMS because other than burning (which is tenchnically chemical but usually counted in the ETL as thermal) that is the only way to trigger an EMS action with chem
by alpacas
September 15th, 2013, 2:49 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

1.1x10^7 m/s away from "Larcie"
by alpacas
September 14th, 2013, 12:23 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

density~1.92x10^14 kg/m^3

making them 10^5 x denser than white dwarfs, and 10^-3 x the density of neutron stars
hopefully. I hope you didn't want the distance to be measured trying to take into account the radius of Del b7730  ;) and the sun because well I didn't
by alpacas
September 11th, 2013, 2:52 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

ngc3132, the star in the image is about absolute magnitude 0.3 (at least the progenitor star is)

Edit: sorry people I am having major technical difficulties with my "hide" function so I'm just writing the answer out for the sake of transparency
by alpacas
September 9th, 2013, 5:42 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 30447

Re: Astronomy C Question Marathon

sorry about the hide function, I tried to use the command but it didn't work. I'll try and fix it.

Ok, at what temperature does a protostar become classified as a T-Tauri star? This sets it on what path on an HR Diagram?

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