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Recommended
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This document discusses the principles and applications of refraction of light. It begins by defining refraction as the bending of light when passing from one medium to another. Snell's law provides a mathematical relationship between the angles of incidence and refraction. The index of refraction is a value that describes how fast light travels in a medium compared to a vacuum. Total internal reflection and fiber optics are applications that make use of refraction. Lenses are used to form images by refracting light, with the lens equation and lensmaker's equation relating focal length and object/image positions. Sample problems demonstrate applying these optical concepts.
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Acoustics
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The laws of thermodynamics
This document discusses the connections between heat and work through the laws of thermodynamics. It introduces the three laws of thermodynamics:
1) The zeroth law establishes that thermal equilibrium is transitive.
2) The first law states that the change in internal energy of a system is equal to the heat added minus the work done.
3) The second law establishes that heat cannot spontaneously flow from a cold to a hot body, and limits the maximum possible efficiency of heat engines and refrigerators.
Heat engines and refrigerators/heat pumps are then discussed as examples of applying the laws of thermodynamics to transfer heat from hot to cold reservoirs to produce work or vice versa. Key concepts like
Vision and optical instruments
The document does not contain any substantive content to summarize. It only contains a placeholder subtitle with no accompanying body text.
Photometry and interactions
This document discusses light and its measurable properties and interactions with matter. It covers calculating the speed of light through historic experiments by Roemer and Fizeau. It also discusses photometry, including luminous intensity, luminous flux, and illuminance. Finally, it examines the interactions of light with matter, such as reflection, absorption, transmission, and scattering. Key light properties and metrics like candela, lumen, and lux are defined.
Properties of sound
The document discusses the key properties of sound:
Pitch refers to the highness or lowness of a sound and depends on the frequency of vibrations. Intensity refers to the energy of a sound wave and is measured in watts per meter squared. Loudness is a subjective measure of how loud a sound seems and is related to intensity, distance from the source, and condition of the transmitting medium. Quality or timbre distinguishes one sound from another by other characteristics beyond pitch and loudness. The document provides examples of the intensity and loudness of common sounds to illustrate these concepts.
The nature of light
The document discusses the nature of light and the electromagnetic spectrum. It begins by introducing the electromagnetic spectrum, which consists of seven classes of electromagnetic waves including radio waves, microwaves, infrared waves, visible light, ultraviolet waves, X-rays, and gamma rays. The document then reviews the historical debates on whether light behaves as particles or waves, including evidence that supported each view. Finally, the document concludes that light has a dual nature, behaving at times as a particle and at times as a wave, based on experiments such as the photoelectric effect.
Acoustics
The document discusses the science of sound and acoustics. It defines sound as a longitudinal wave that carries energy through vibrations of matter and is propagated through a medium. The audible range for humans is between 20 Hz to 20,000 Hz, while frequencies lower than 20 Hz are infrasonic and higher are ultrasonic. Some animals can detect ultrasonic frequencies. Factors that affect the speed of sound include the phase, density, elasticity, and temperature of the medium. The speed of sound is faster in denser, more elastic solids and liquids. In air, the speed of sound increases by 0.6 m/s for every degree Celsius increase in temperature.
Historia del internet
El documento resume brevemente la historia del desarrollo de Internet desde 1969 hasta la actualidad. En 1969 se creó la primera conexión entre dos universidades, en 1978 se estableció la primera red no militar, en 1989 Tim Berners-Lee desarrolló la World Wide Web, y en los años siguientes surgieron importantes sitios web y servicios como Wikipedia, iTunes, MySpace, Skype, Facebook y Google Chrome.
Dream Expedition
The document discusses the results of a study on the effects of a new drug on memory and cognitive function in older adults. The double-blind study involved 100 participants aged 65-80 and found that those given the drug performed significantly better on memory and problem-solving tests than the placebo group after 6 months. However, longer term effects beyond the 6 month period studied are still unknown.
Guia del sistema circulatorio
El documento presenta un plan de actividades para una lección sobre el sistema circulatorio. La lección consiste en 3 ítems: 1) Identificar el nombre del sistema circulatorio, 2) Completar un rompecabezas sobre este sistema, y 3) Responder preguntas sobre las características de los vasos sanguíneos como arterias, venas y capilares.
Mangá
O documento discute o que é mangá, como surgiu no Japão feudal inspirado em teatros de sombra, e como se desenvolveu com influência dos quadrinhos americanos no século 20. Também menciona como os mangás são produzidos pelos mangakas, que trabalham longas horas sob pressão para entregar capítulos semanalmente às editoras.
Wiki
El documento describe las wikis y su utilidad para compartir información de forma colaborativa. Una wiki es una página web que permite que cualquier usuario modifique su contenido y la mantenga actualizada. Plataformas como Wikipedia, Wikispaces y los documentos de Google permiten crear wikis de forma sencilla y gratuita.
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THESE ARE BUT A FEW OF THE NAMES OF MURDERD WHITES IN SOUTH AFRICAN SINCE 1994. THIS IS DEMOCRACY CO...
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Este currículo resume a experiência profissional e formação acadêmica de Maria Antunes da Silva Lisboa. Ela tem uma vasta experiência em jornalismo, comunicação e marketing, além de ter trabalhado em lojas e como fotógrafa. Atualmente cursa o programa de Fotografia no IADE e é fluente em inglês e espanhol.
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White Genocide In South Africa - Here Are The Names
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- 3. •sistematik düşünme •farklı yönleri görme •düşünme ve doğru karar verme becerileri Bilinmesi Gerekenler I.farklı açılardan bakma II.şapkaların anlamları anlatılması gerekir
- 5. Drama Çeşitleri: Yaratıcı Drama 2. Psiko Drama 3. Eğitici Drama 1.
- 6. •AÖF Yayınları •Mehmet Arslan •Ahmet Doğanay •Açı Yayınları •İhtiyaç Yayınları