Search found 8 matches

by Polka-dotty
March 19th, 2014, 8:48 pm
Forum: 2014 Question Marathons
Topic: Disease Detectives B/C Question Marathon
Replies: 110
Views: 18816

Re: Disease Detectives B/C Question Marathon

Whewf! I have also never heard of that before. Give a brief description of Selection Bias, Recall Bias, Data Bias, Measurement Bias.
by Polka-dotty
March 6th, 2014, 5:34 pm
Forum: 2014 Question Marathons
Topic: Disease Detectives B/C Question Marathon
Replies: 110
Views: 18816

Re: Disease Detectives B/C Question Marathon

Correct! I think it is your turn to ask a question now.
by Polka-dotty
March 5th, 2014, 5:43 pm
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73681

Re: Boomilever B/C

Yes, sorry! I meant snapped, but I forgot to edit that. It snapped off at 0.3 cm from the dowel rod.
I thought that the efficiencies might go down due to the longer length, but so far at all the invitationals they don't seem to be any less than last year.
by Polka-dotty
March 5th, 2014, 2:34 pm
Forum: 2014 Question Marathons
Topic: Disease Detectives B/C Question Marathon
Replies: 110
Views: 18816

Re: Disease Detectives B/C Question Marathon

Here is a question:
Describe the difference between Pathogenicity, Virulence, and Infectivity. :)
by Polka-dotty
March 5th, 2014, 2:27 pm
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73681

Re: Boomilever B/C

Well our most recent one was perfectly fine, no cracking or anything, and then all of a sudden the right tension arm just snapped at around 11-12 kilograms. It broke about 0.3 cm away from the dowel rod and just sheared. I was thinking that maybe our loading block was resting on the right tension ar...
by Polka-dotty
March 4th, 2014, 5:49 pm
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73681

Re: Boomilever B/C

I am pretty sure we are using enough glue, but maybe we need to figure out a better way to get more surface area for the glue. Can you post a picture, or describe the boomilever with more detail? It is an I-beam design, so two I-beams with bass on the top, balsa in the middle, and balsa on bottom. ...
by Polka-dotty
March 3rd, 2014, 8:12 am
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73681

Re: Boomilever B/C

I am pretty sure we are using enough glue, but maybe we need to figure out a better way to get more surface area for the glue.
by Polka-dotty
March 3rd, 2014, 7:22 am
Forum: 2014 Build Events
Topic: Boomilever B/C
Replies: 690
Views: 73681

Re: Boomilever B/C

Our Boomilevers are failing at the tension arm...it just breaks off without damaging any other part of the boomilever. It breaks off at the dowel rod (what we are using to mount the Boomilever). The tension arms are bass wood and the base is an I-beam. Suggestions for why this is happening and any s...

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