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You can use MathJax in the discussion.

Jungle King 29. 11. 2017, 20:55

https://www.google.co.in/search?client=safari&rls=en&q=rubber+band&ie=UTF-8&oe=UTF-8&gfe_rd=cr&dcr=0&ei=MRAfWqjiAcPy8AewuoSoBg A rubber band is a loop of rubber. So, the force constant used should be 2k, and the answer, $\sqrt{2}$ times the present answer, i.e., 9.8m/s

Organizers 29. 11. 2017, 21:16

We are sorry the task is not hundred percent unambiguous. The rubber band should be considered as a one object with total stiffness k.

Carmel CornSUPERSTARs 玉米超級明星 29. 11. 2017, 20:41

Where can we find the solution?

PMF 29. 11. 2017, 20:36

Solutions, problem 30, it is written that r3 is inner radius, but calculated as it was outter radius??

Organizers 29. 11. 2017, 20:50

We are sorry. There is an error in translation. There should be written "outer radius" in the task.

Organizers 29. 11. 2017, 20:08

The next edition of Online Physics Brawl will be held on 28th November 2018.

Organizers 29. 11. 2017, 20:04

Congratulation to the winners in their respective categories: Vypínači Hejčín (A) Hawkingovo zářená (B) #To je na vás. :]》 (C) SuperPentaPhosphate (Foreign HS) FtáKopySk (Open)

the CATALYST 29. 11. 2017, 19:52

for q24, which frames are the speeds given in?

Organizers 29. 11. 2017, 19:57

Consider a static Earth and an observer standing on it.

Vrli Zeničani 29. 11. 2017, 19:36

mozel neko nesto sapnut

WWP South 29. 11. 2017, 19:16

For fol 25, over what time period are you saying the average detection is 10?

Organizers 29. 11. 2017, 19:23

Long enough to get a statistically significant average, but short enough to neglect any supposed decrease of activity of the source.

The Laplace Army 29. 11. 2017, 18:55

is fol 28 consistent?

Organizers 29. 11. 2017, 19:00

We believe that our solution is correct (and two teams in the competition have already solved it). If you have some more specific questions, send it to online(at)fyziklani.cz

Life is Stern and Earnest 29. 11. 2017, 18:20

Oh sorry, could you delete this comment? But get back to us on the question?

Organizers 29. 11. 2017, 18:22

It has been deleted, send the question via e-mail.

Life is Stern and Earnest 29. 11. 2017, 18:22

what is the email we should send to?

Organizers 29. 11. 2017, 18:25

online(at)fyziklani.cz