Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Getting the Swing of Surface Gravity   Sports are a popular and effective way to illustrate physics principles.
Baseball in particular presents a number of opportunities to motivate student
interest and teach concepts. Several articles have appeared in this journal on
this topic, illustrating a wide variety of areas of physics. In addition,
several websites and an entire book are available. In this paper we describe a
student-designed project that illustrates the relative surface gravity on the
Earth, Sun and other solar-system bodies using baseball. We describe the
project and its results here as an example of a simple, fun, and student-driven
use of baseball to illustrate an important physics principle.

18
The categories of this paper are: econ
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th