Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-of-flight of solitary waves in dry and wet chains of beads:
  experimental results and phenomenological models   A solitary wave is generated by impacting a dry chain of beads on one of its
ends. Its speed depends on the speed $v_0$ of the striker and the details of
the contact force. The time-of-flight (ToF) of the wave was measured as a
function of $v_0$, along with the effect of adding a fluid around the contact
points. The ToF displays a complex dependence on the fluid's rheological
properties not seen in previous works. A power-law dependence of the ToF on
$v_0$ in both, dry and wet cases was found. It turned out that the Hertz plus
viscoelastic interactions are not enough to account for our results. Two
phenomenological models providing a unified and accurate account of our results
were developed.

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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
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The categories of this paper are: econ
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The categories of this paper are: astro-ph
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The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
2
The categories of this paper are: math