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RANDAI DAN KAYAT SERTA SIKAP PEMUKA MASYARAKAT TERHADAPNYA DALAM MASYARAKAT KABUPATEN INDRAGIRI HULU, DAERAH RIAU
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| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VI/2 (No. 2) |
| Halaman | : | 26-34 |
| Abstrak | : | - |
Motion of a Rocking Rainbow
| Pengarang | : | Joel David Krehbiel |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 3) |
| Halaman | : | 174-177 |
| Abstrak | : | A children’s stacking rainbow toy easily demonstrates the motion of a rocking semicylinder or semicylindrical shell. This toy provides a simple way to discuss how the period of an oscillating object depends on the location of the center of mass and the moment of inertia about the ground. Here, I develop the theory for the period of a rocking semicylinder and a rocking semicylindrical shell. The theory agrees well with experimental evidence of the period of the rocking rainbow. For her birthday, my 4-year-old daughter got the stacking rainbow toy shown in Fig. 1. This toy is made of several different bent pieces of wood that fit inside each other and are painted to mimic the colors of a rainbow.1 In addition to providing opportunities for children to build with the curved pieces, this toy can be inverted and tilted slightly and then released to show an object... |
CERITA PENDEK POPULER DALAM DUNIA SASTRA INDONESIA
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VII/2 (No. 2) |
| Halaman | : | 2-8 |
| Abstrak | : | - |
Designing for Proudness
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 3) |
| Halaman | : | 168–173 |
| Abstrak | : | In this paper, we center the idea of having proud moments, or feelings of proudness, in physics contexts. First, we outline the idea, list design principles, and explore connections between these principles. Then, we give a concrete example of how students and faculty can work together to enhance proud moments in an already-existing introductory college physics course. Our particular example focuses on a typical moment in physics classrooms: when small groups share their work with the entire class. As educators, we want students to have moments where they feel really good about their learning and accomplishments—moments where their faces are beaming, where they can’t wait to tell family or friends the story, moments that they can recall years later. We refer to this general idea as “proudness” (rather than “pride”) to highlight the complexity of the idea and the importance of unpacking its meaning. |
DICARI FORMULA PUPUK SASTRA
| Pengarang | : | Sumardi |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VI/2 (No. 2) |
| Halaman | : | 10-25 |
| Abstrak | : | - |
PEMBINAAN BAHASA INDONESIA SEKITAR AWAL PERTUMBUHANNYA
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | Bahasa dan Sastra |
| Volume / Edisi | : | VI/2 (No. 2) |
| Halaman | : | 2-9 |
| Abstrak | : | - |
Decluttering our thinking with the life-changing magic of twiddle
| Pengarang | : | Sanjoy Mahajan |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 86 (No. 2) |
| Halaman | : | 143-145 |
| Abstrak | : | With apologies to Marie Kondo,1 this column is a homage to the humble ∼ symbol, with the meaning “is very, very roughly equal to,” for its power to declutter our thinking. But examples belong before disquisitions, so here are my twiddle-rich solutions to the two problems from the last column.2 1. What is, roughly, the fuel efficiency or fuel consumption of a bicyclist powered by peanut butter? To give myself metric practice, I use the European units of liters per 100 km and estimate the volume V of peanut butter required to bicycle the canonical distance of 100 km. This volume is the energy required divided by peanut butter's energy density ??. The energy required is the canonical distance times the drag force Fdrag (assuming that drag is the main loss). |
An optical levitation system for a physics teaching laboratory
| Pengarang | : | Oscar Isaksson; Magnus Karlsteen; Mats Rostedt; Dag Hanstorp |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 86 (No. 2) |
| Halaman | : | 135-142 |
| Abstrak | : | We describe an experimental system based on optical levitation of an oil droplet. When combined with an applied electric field and a source of ionizing radiation, the setup permits the investigation of physical phenomena such as radiation pressure, light diffraction, the motion of a charged particle in an oscillating electric field, and the interaction of ionizing radiation with matter. The trapping occurs by creating an equilibrium between a radiation pressure force and the force of gravity. We have found that an oil droplet can be trapped for at least nine hours. The system can be used to measure the size and total electric charge on the trapped droplet. The intensity of the light from the trapping laser that is scattered by the droplet is sufficient to allow the droplet to be easily seen with the naked eye, covered by laser alignment goggles. When oscillating under the influence of an ac electric field, the motion of the droplet can be described as that of a driven, damped harmonic oscillator. The magnitude and polarity of the charge can be altered by exposing the droplet to ionizing radiation from a low-activity radioactive source. Our goal was to design a hands-on setup that allows undergraduate and graduate students to observe and better understand fundamental physical processes. |
Self-focusing quantum states
| Pengarang | : | Anthony Allan D. Villanueva |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 86 (No. 2) |
| Halaman | : | 126-134 |
| Abstrak | : | We discuss a class of solutions of the time-dependent Schrödinger equation such that the position uncertainty temporarily decreases. This self-focusing or contractive behavior is a consequence of the anti-correlation of the position and momentum observables. Since the associated position density satisfies a continuity equation, upon contraction the probability current at a given fixed point may flow in the opposite direction of the group velocity of the wave packet. For definiteness, we consider a free particle incident from the left of the origin, and establish a condition for the initial position-momentum correlation such that a negative probability current at the origin is possible. This implies a decrease in the particle's detection probability in the region x > 0, and we calculate how long this occurs. Analogous results are obtained for a particle subject to a uniform gravitational force if we consider the particle approaching the turning point. We show that position-momentum anti-correlation may cause a negative probability current at the turning point, leading to a temporary decrease in the particle's detection probability in the classically forbidden region. |
Oscillations in a half-empty bottle
| Pengarang | : | Andreane Bourges; Amelie Chardac; Aude Caussarieu; Nicolas Plihon; Nicolas Taberlet |
| Nama Majalah/Jurnal | : | American Journal of Physics |
| Volume / Edisi | : | 86 (No. 2) |
| Halaman | : | 119-125 |
| Abstrak | : | When a half-empty bottle of water is pushed to roll on a flat surface, the oscillations of the fluid inside the bottle induce an overall jerky motion. These velocity fluctuations of the bottle are studied through simple laboratory experiments accessible to undergraduate students and can help them to grasp fundamental concepts in mechanics and hydrodynamics. We first demonstrate through an astute experiment that the rotation of the fluid and the bottle is decoupled. The equations of motion are then derived using a mechanical approach, while the hydrodynamics of the fluid motion is explained. Finally, the theory is tested against two benchmark experiments. |