In this paper we describe how a Nintendo Wii remote control (known as the Wiimote) can be used in the design and implementation of several undergraduate-level experiments in a physics laboratory class. An experimental setup composed of a Wiimote and a conveniently located IR LED allows the trajectory of one or several moving objects to be tracked and recorded accurately, in both long and short displacement. The authors have developed a user interface program to configure the operation of the acquisition system of such data. The two experiments included in this work are the free fall of a body with magnetic braking and the simple pendulum, but other physics experiments could have been chosen. The treatment of the data was performed using Bayesian inference.
In the present article a dynamic system formed by a
microporous membrane-type Nuclepore (track-etched
hydrophilic policarbonate film) is characterized. The pore size of
the membranes ranges from 0.6 to 8 μm.
The membranes are put between two phases of bidistilled, degassed,
and deionized water, and their response
to a flow step is studied in order to know the transfer function for
the membranes. Nevertheless, an
indetermination between two possibilities is observed (a first- or
second-order system characterization). To
resolve it, a wave input is used, and from the results obtained it can
be concluded that it is a first-order
system. As a consequence, the hydrodynamic permeability as a
complex function of the frequency is obtained
from a proposed electrical model whose equivalent resistance and
capacitance are found.
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