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All Journal Kasuari: Physics Education Journal (KPEJ) Jurnal Armada Pendidikan
Rodika Utama
Universitas Ahmad Dahlan
Education Physics

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Analisis Periode Rotasi Matahari Berdasarkan Pergerakan Bintik Matahari AR 4207 pada Citra SolarHam Tanggal 1–8 September 2025 Rustaman; Rodika Utama
JURNAL ARMADA PENDIDIKAN Vol 4 No 1 (2026): JURNAL ARMADA PENDIDIKAN
Publisher : Kilau Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60041/jap.v4i1.333

Abstract

This study aims to determine the rotational period of the Sun by analyzing the motion of a sunspot across the solar disk. The active sunspot region AR 4207 was examined using solar continuum images acquired on 1 and 8 September 2025. The position of the sunspot on each date was projected onto a circular diagram with the central meridian as the reference axis in order to measure its angular displacement. The projected angles relative to the central meridian were found to be  on 1 September and  on 8 September, yielding a total displacement of  over a seven-day interval. By applying the relation , the solar rotation period was calculated to be  days. This result aligns with the typical synodic rotation period of the Sun at low latitudes. The findings demonstrate that sunspot tracking provides a simple and effective method for estimating the Sun’s rotation, making it well suited for educational and observational activities in astronomy.
Theoretical Analysis of Thermal Equilibration in a Rotating Solid Sphere Partially Immersed in a Hot Fluid: A Study Inspired by the Onde Cooking Process Rodika Utama; Moh. Toifur; Ishafit Ishafit; Devi Farah Dina
Kasuari: Physics Education Journal (KPEJ) Vol. 9 No. 1 (2026): June 2026
Publisher : Universitas Papua, Jurusan Pendidikan Fisika FKIP Unipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37891/kpej.v9i1.1053

Abstract

This study presents a theoretical analysis of thermal equilibration in a sphere rotating with a constant angular velocity, where part of the sphere is submerged in a hot fluid and the other part is exposed to air. The model is inspired by the traditional onde-onde cooking process, which illustrates temperature equalization through continuous rotation during heating. By applying the steady-state heat equation in spherical coordinates and imposing boundary conditions representing two temperature regions (the hot fluid at T1 and the air at T2), the criterion for rotational equilibrium is obtained. The result shows that the angular velocity must satisfy the minimum threshold ωmin=k/ρcR2, where k is the thermal conductivity, ρ is the density, c is the specific heat, and R is the radius of the sphere. When the actual rotation rate exceeds this limit, the temperature distribution becomes nearly uniform, and the entire sphere approaches thermal equilibrium. The findings clarify the physical mechanism through which rotation enhances temperature uniformity in partially immersed solids. Beyond its culinary analogy, the model offers valuable insight for rotating heat exchangers, industrial drying systems, and thermal homogenization in composite materials.
Learning Transformation in the Merdeka Belajar and Kampus Berdampak Era: Synergy of Technology, Pedagogy, and Digital Assessment Rodika Utama; Dian Artha Kusumaningtyas; Mohamed Yusuf Wako; Asnin Nur Salamah
Kasuari: Physics Education Journal (KPEJ) Vol. 9 No. 1 (2026): June 2026
Publisher : Universitas Papua, Jurusan Pendidikan Fisika FKIP Unipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37891/kpej.v9i1.1065

Abstract

The transformation of physics education in the Merdeka Belajar era represents a fundamental paradigm shift in how teachers and students perceive, construct, and apply scientific knowledge. This article presents a theoretical and reflective analysis of the integration of technology, pedagogy, and digital assessment within the context of Indonesian physics education. Using a narrative–reflective approach and a review of recent literature, the study articulates how the Technological Pedagogical and Content Knowledge (TPACK) framework serves as a conceptual foundation for building collaborative, flexible, and scientifically literate learning ecosystems. The findings suggest that the integration of digital tools—such as PhET interactive simulations and Tracker-based video analysis—enhances conceptual understanding, promotes critical thinking, and facilitates continuous formative assessment. Philosophically, Merdeka Belajar embodies not only curricular flexibility but also a humanistic vision of science education that nurtures empathy, social responsibility, and ecological awareness. Therefore, the transformation of physics education is not merely technological modernization but an epistemological reconstruction toward ethical, collaborative, and sustainable learning.
Co-Authors Asnin Nur Salamah Devi Farah Dina Dian Artha Kusumaningtyas Ishafit Ishafit Moh. Toifur Mohamed Yusuf Wako Rustaman