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This study investigates the influence of ChatGPT, an AI-based language model, on student performance in a physics course. We conducted an experimental analysis with two cohorts of students in a second-semester engineering physics course. The control group (Physics 2 2022B) used traditional teaching methods, while the experimental group (Physics 2 2023A) integrated ChatGPT as a learning tool. Our results indicate that the use of ChatGPT led to a significant decrease in student performance, as evidenced by lower grades and negative Hake factors compared to the control group. In addition, a survey of students revealed conflicting perceptions of the usefulness of ChatGPT in teaching physics. While most recognized its usefulness in understanding concepts and providing information, concerns were raised about its potential to reduce critical thinking and independent learning. These findings suggest that while ChatGPT can be a useful tool, it should be used with caution and as a supplement to traditional teaching methods, rather than as a stand-alone solution. The study underlines the importance of critical and reflective use of AI tools in educational settings and highlights the irreplaceable role of teachers in providing comprehensive educational support., Comment: 9 pages and 13 figures

In this paper, the dynamic case of a system made up of two blocks connected by a string over a smooth pulley is revisited. One mass lies on a horizontal surface without friction, and the other mass has a vertical displacement. The motion equation is obtained and its solution is determined using the Mathematica package. Also, an experimental montage for this system is made and experimental data for the vertical position $y$ in function of the time $t$ are obtained using a Data Acquisition System and the Tracker video analysis. The relation $y$ vs $t$ can be represented by a polynomial of degree six. An average relative error of 3.61 (10.14) % is obtained between the theoretical results acquired with Mathematica and the data taken from the Tracker (Data Acquisition System)., Comment: 8 pages, 10 figures

In this paper we review the system made up by two blocks connected by a string over a smooth pulley with variable tension. One block lies on an horizontal surface and the another block is hanging vertically. We carry out a complete and systematic analysis for the tension of the string as function of the angle and the horizontal distance x, at static equilibrium. We find a simmetry-like that corresponds to two different confifigurations with the same tension and obtain the relationship that must satisfy two angles or two horizontal distances to obtain equal tension.

Extended theories are widely used in the literature to describe relativistic fluids. The motivation for this is mostly due to the causality issues allegedly present in the first order in the gradients theories. However, the decay of fluctuations in the system is also at stake when first order theories that couple heat with acceleration are used. This paper shows that although the introduction of the Maxwell-Cattaneo equation in the description of a simple relativistic fluid formally eliminates the generic instabilities identified by Hiscock and Lindblom in 1985, the hypothesis on the order of magnitude of the corresponding relaxation term contradicts the basic ordering in Knudsen's parameter present in the kinetic approach to hydrodynamics. It is shown that the time derivative, stabilizing term is of second order in such parameter and thus does not belong to the Navier-Stokes regime where the so-called instability arises., Comment: The authors wish to avoid some posible overlap with arXiv:1104.0858

We studied the electronic band structure of the low-index fcc Ag surfaces (001), (110) and (111), by using the empirical tight-binding method in addition with the surface Green function matching method. We report the energy values for different surface and resonance states and compare with the available experimental and theoretical data., Comment: 13 pages, 6 figures

As a second part of a previous paper, here the calculated electronic band structure of ideal Pt(100) and Pt(110) surfaces, studied using density functional theory and the empirical tight-binding method, is presented. A detailed discussion of the surface- and resonance--states is given. It is shown that the calculated surface- and resonance--states of ideal Pt(100) surfaces agree very well with the available experimental data. For Pt(110), some of the surface- and resonance-states are characteristic of the low degree of symmetry of the surface and are identified as being independent of surface reconstruction effects. As in the previous paper, the density functional calculations were performed using the full potential linearized augmented plane wave method, and the empirical calculations were performed using the tight-binding method and Surface Green's Function Matching Method., Comment: 10 pages, 3 figures