Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Projectile Trajectory of Penguin's Faeces and Rectal Pressure Revisited   We discuss a trajectory of penguins' faeces after the powerful shooting due
to their strong rectal pressure. Practically, it is important to see how far
faeceses reach when penguins expel them from higher places. Such information is
useful for keepers to avoid the direct hitting of faeceses. We estimate the
upper bound for the maximum flight distance by solving the Newton's equation of
motion. Our results indicate that the safety zone should be 1.34 meters away
from a penguin trying to poop in typical environments. In the presence of the
viscous resistance, the grounding time and the flying distance of faeces can be
expressed in terms of Lambert {\it W} function. Furthermore, we address the
penguin's rectal pressure within the hydrodynamical approximation combining
Bernoulli's theorem and Hagen-Poiseuille equation for viscosity corrections. We
found that the calculated rectal pressure is larger than the estimation in the
previous work.

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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: funct-an
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The categories of this paper are: solv-int
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The categories of this paper are: hep-lat
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg