Search found 10 matches

May 3rd, 2014, 6:25 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 12864

Re: Astronomy C Question Marathon

Thank you syo_astro for clarifying. 11 hours = T3-T1.
May 3rd, 2014, 4:57 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 12864

Re: Astronomy C Question Marathon

When you say "the eclipse of the primary," are we talking primary minimum, or when the secondary star eclipses the primary star? I am referring to the secondary star eclipsing the primary. Also, on an eclipsing binary light curve, is this 11 hours = T3 - T1? Or T4 - T1? I'm not sure what ...
May 3rd, 2014, 3:10 pm
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 12864

Re: Astronomy C Question Marathon

Nope.
May 3rd, 2014, 10:01 am
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 12864

Re: Astronomy C Question Marathon

The orbit of an eclipsing binary system is oriented such that it is observed from directly edge-on. The system has a period of 68 hours, the secondary star has an orbital velocity of 72.5 km/s, and the eclipse of the primary star lasts 11 hours. What is the diameter of the primary star?
May 3rd, 2014, 8:03 am
Forum: 2014 Question Marathons
Topic: Astronomy C Question Marathon
Replies: 81
Views: 12864

Re: Astronomy C Question Marathon

I noticed that both stars were redshifted. I'm not sure how to apply Hubble's Law to remedy that in this situation (i.e. how to calculate a distance from the given information), so I assumed one of the stars was supposed to be blueshifted. Solution - I feel my answer to part C is ridiculously large,...
February 19th, 2014, 6:34 pm
Forum: 2014 Question Marathons
Topic: Rocks & Minerals B/C ID/Question Marathon
Replies: 393
Views: 37254

Re: Rocks & Minerals B/C ID/Question Marathon

To keep things moving:

image

What two minerals are shown here?
Explain the formation of this specimen. Which mineral came "first?"
February 19th, 2014, 5:57 pm
Forum: 2014 Question Marathons
Topic: Geologic Mapping C Question Marathon
Replies: 121
Views: 18771

Re: Geologic Mapping C Question Marathon

No problem. The following are measurements of five lineations, taken at five different outcrops. Locality; Attitude of outcrop surface; Pitch of lineation 1; N60W, 84NE; 76E 2; N10W, 30E; 50N 3; N40E, 70SE; 63SW 4; N23W, 30W; 50S 5; N88W, 45N; 59E If these lineations are elements of a planar fabric ...
February 18th, 2014, 8:24 pm
Forum: 2014 Question Marathons
Topic: Geologic Mapping C Question Marathon
Replies: 121
Views: 18771

Re: Geologic Mapping C Question Marathon

syo_astro wrote:The frictional movements of rocks during faulting creates what type of lineation?

January 3rd, 2014, 8:28 pm
Forum: 2014 Question Marathons
Topic: Shock Value B/Circuit Lab C Question Marathon
Replies: 53
Views: 10984

Re: Shock Value B/Circuit Lab C Question Marathon

wjnewhouse is correct.
December 30th, 2013, 7:59 am
Forum: 2014 Question Marathons
Topic: Shock Value B/Circuit Lab C Question Marathon
Replies: 53
Views: 10984

Re: Shock Value B/Circuit Lab C Question Marathon

Since no one has posted in a while, I'll ask a question. Given the logic gate question on the previous page, show that its boolean algebraic representation https://dl.dropboxusercontent.com/u/15231443/Before.png is equivalent to the expression https://dl.dropboxusercontent.com/u/15231443/After.png ....