Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigating 3D printed Cartesian Divers   Despite the difficult circumstances due to the COVID-19 pandemics, physics
students can tackle interesting questions that are part of physics competitions
as the German Physicists' Tournament (GPT) 2020. Due to the COVID-19 pandemics
in 2020, many competitions such as the GPT are held online. Furthermore, the
usual options of equipment offered by the supervising university institutions
could not be used by the students. The problems of the GPT 2020 therefore had
to be chosen in such a way that they could be examined at home using simple
means. One of these supposedly simple but profound experiments - the Cartesian
divers - is described in this article. By using 3D printing, the relevant
variables could be varied in a controlled manner and the theoretical model for
Cartesian divers could be examined experimentally.

15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
2
The categories of this paper are: math
21
The categories of this paper are: adap-org