Yanira sacou unhas fotos a uns cogomelos. A vermella é unha Amanita muscaria , a segunda...non me traevo a decilo por estar xa moi pasada.
cosas: FOTOS setas
miércoles, 24 de noviembre de 2010
sábado, 20 de noviembre de 2010
Tema 1. Boletíns de Actividades
Todos os que tivéchedes problemas para dividir ou multiplicar con decimais, debérades practicar con estes exercicios que vos deixo aquí:
div style="width:477px" id="__ss_5843575">Divisions
div style="width:477px" id="__ss_5843575">Divisions
1ºB.Exposicións das lecturas sobre os libros "Cárabo": Alfredo
Alfredo fixo unha explicación moi clara, vocalizando, e axudado por unha pequena presentación powerpoint con 4 fotos que axudou moito a que o público poidera comprender de xeito doado a súa charla. Houbo atrancos co idioma, pero seguro que mellora na próxima. Outro aspecto salientable é que podería xesticular máis para enfatizar os puntos máis importantes. En resumo, a valoración global, salvando o aspecto idiomático é moi boa.
viernes, 19 de noviembre de 2010
Actividades de Reforzo:
A capacidade:
http://redes.agrega.indra.es/repositorio/13062008/es_20080613_2_9161940//index.html
O Volumen:
http://redes.agrega.indra.es/repositorio/13062008/es_20080613_3_9162810/index.html
http://redes.agrega.indra.es/repositorio/13062008/es_20080613_2_9161940//index.html
O Volumen:
http://redes.agrega.indra.es/repositorio/13062008/es_20080613_3_9162810/index.html
Actividades de reforzo de matemáticas. Multiplicar e dividir con decimais.E as unidades de masa, volume e capacidade
Antes de nada uns links para exercicios en flash de divisións:
miércoles, 17 de noviembre de 2010
A fotografía con telescopio terrestre
Consiste en acoplar unha cámara de fotos ao ocular dun telescopio terrestre conseguindo moitos aumentos e sacar fotos aos animis desde distancias considerables sen molestar nen perturbarlos o máis mínimo. Así os científicos e naturalistas conseguimos estudar o seu comportamento e tomar rexistro gráfico en foto e vídeo do mesmo.
Un exemplo é esta foto que vos poño dunha parelliña de alcaudóns dorsivermellos, que foron sacados por min (foto pequena dereita) a unha distancia de 12-15 m na outra ribeira do río sobre o arbustiño da esquerda.
Como vedes Permite sacar fotos a animais desde unha lonxitude moi considerable.
Nestes intres está en marcha o premio fotográfico máis prestixioso do mundo feito con esta disciplina, o Swarovski "Digiscoper of the year". Onde podedes ver máis fotos de este tipo e incluso escoller as vosas favoritas.
http://digiscoperoftheyear.com/es/las-imagenes
lunes, 15 de noviembre de 2010
1ºA.Presentacións traballos. Álvaro e o Muscardinus avellanarius
Axudaría moito empregar xestos cas máns e un ton de voz menos dubidativo, pero para ser o 1º do grupo fixoo moi ben. Taméns sería bo que o comezo nos fixera unha introducción do animaliño, deixando satisfeita a curiosidade do persoal con cousas como lonxevidade, tamño, peso...etc
Para poder ver as anotacións que lle fixen ó vídeo teredes que velo dende o portal de youtube, xa que ncrustado no blog non permite despregar as devanditas anotacións. Se facedes dobre click sobre o vídeo de embaixo, xa se vos abre a páxina do vídeo en youtube.
sábado, 13 de noviembre de 2010
O Outono, cogomelos e cogomelos xigantes
Parabéns para Laura e amosarnos a todos este cogomelo de récord!
miércoles, 10 de noviembre de 2010
1ºB.Exposicións das lecturas sobre os libros "Cárabo": Dani & Miguel
En xeral, bastante ben . Felicitar a Daniel, xa que non o tiña preparado, pois aproveitou para expoñer ó faltar Alfredo. Miguel, expresouse moi ben e xesticulou, axudando as explicacións, incluso trouxo a unha tartaruga (case se esquece), pero unhas fotos (para proxectalas co cañón, ou ben impresas en papel, axudarían moito).
Como veredes fixen uns apuntamentos sobre o vídeo, para que vaidades mellorando.
Como veredes fixen uns apuntamentos sobre o vídeo, para que vaidades mellorando.
miércoles, 3 de noviembre de 2010
Un pouco de ciencia: experimento menos &coke
http://ajp.aapt.org/resource/1/ajpias/v76/i6/p551_s1?isAuthorized=no
The startling reaction between Diet Coke and Mentos sweets, made famous in thousands of YouTube videos, finally has a scientific explanation. A study in the US has identified the prime factors that drive the fizzy plumes from Coke bottles: the roughness of the sweet and how fast it plummets to the bottle's base.
"If you drop a pack of Mentos into a bottle of Diet Coke, you get this huge fountain of spray and Diet Coke foam coming out," says Tonya Coffey, a physicist at Appalachian State University in Boone, North Carolina. "This was a good project for my students to study because there was still some mystery to it."
When mint or fruit Mentos are dropped into a fresh bottle of Diet Coke, a jet of Coke whooshes out of the bottle's mouth and can reach a height of 10 metres. Theories abound as to why this happens, with some bloggers speculating that it is an acid-base reaction because Coke is acidic.
Experiments in a 2006 edition of the Discovery Channel programme Mythbusters suggested the chemicals responsible for the reaction are gum arabic and gelatine in the sweets, and caffeine, potassium benzoate and aspartame in the Coke. But there have been no rigorous scientific studies of the reaction until now.
Fizzy liquids
To find out more, Coffey and a team of students tested the reactions between Diet Coke and fruit Mentos, mint Mentos, and various ingredients such as other mints, dish-washing detergent, table salt and sand. They also compared reactions using other fizzy liquids such as caffeine-free and sugary colas, as well as soda water and tonic water.
All the reactions took place in a bottle angled at 10° off vertical and the fountain trajectories were recorded on video. The team also investigated the total mass lost in the fountain and the influence of the sweet's surface roughness.
The results showed that Diet Coke created the most spectacular explosions with either fruit or mint Mentos, the fountains travelling a horizontal distance of up to 7 metres.
But caffeine-free Diet Coke did just as well, suggesting that caffeine does not accelerate the reaction, at least at the normal levels in the drink.
Measurements of the pH of the Coke before and after the experiments showed that its acidity did not change, ruling out the idea that a simple acid-base reaction drives the fountains.
Instead, the vigour of the jets depends on various factors that affect the growth rate of carbon dioxide bubbles.
The rough, dimply surfaces of Mentos encourage bubble growth because they efficiently disrupt the polar attractions between water molecules, creating bubble growth sites.
Rough candy
"Water molecules like to be next to other water molecules, so basically anything that you drop into the soda that disrupts the network of water molecules can act as a growth site for bubbles," Coffey told New Scientist. "And if you have rough candy with a high ratio of surface area to volume, then there's more places for the bubbles to go."
Low surface tension also helps bubbles grow quickly. Measurements showed that the surface tension in water containing the sweetener aspartame is lower than in sugary water, explaining why Diet Coke creates more dramatic fountains than sugary Coke.
Another factor is that the coatings of Mentos contain gum arabic, a surfactant that further reduces surface tension in the liquid. Rough-surfaced mints without the surfactant did not create such large fountains.
Mentos are also fairly dense and sink rapidly, quickly creating bubbles that seed further bubbles as they rise. Crushed Mentos that fell more slowly created puny fountains that only travelled about 30 centimetres.
"Middle-school teachers are getting their students out onto the baseball field next to their school and doing this reaction, and their students love it," says Coffey. "It's a great way to get students excited about science and learn something new."
The startling reaction between Diet Coke and Mentos sweets, made famous in thousands of YouTube videos, finally has a scientific explanation. A study in the US has identified the prime factors that drive the fizzy plumes from Coke bottles: the roughness of the sweet and how fast it plummets to the bottle's base.
"If you drop a pack of Mentos into a bottle of Diet Coke, you get this huge fountain of spray and Diet Coke foam coming out," says Tonya Coffey, a physicist at Appalachian State University in Boone, North Carolina. "This was a good project for my students to study because there was still some mystery to it."
When mint or fruit Mentos are dropped into a fresh bottle of Diet Coke, a jet of Coke whooshes out of the bottle's mouth and can reach a height of 10 metres. Theories abound as to why this happens, with some bloggers speculating that it is an acid-base reaction because Coke is acidic.
Experiments in a 2006 edition of the Discovery Channel programme Mythbusters suggested the chemicals responsible for the reaction are gum arabic and gelatine in the sweets, and caffeine, potassium benzoate and aspartame in the Coke. But there have been no rigorous scientific studies of the reaction until now.
Fizzy liquids
To find out more, Coffey and a team of students tested the reactions between Diet Coke and fruit Mentos, mint Mentos, and various ingredients such as other mints, dish-washing detergent, table salt and sand. They also compared reactions using other fizzy liquids such as caffeine-free and sugary colas, as well as soda water and tonic water.
All the reactions took place in a bottle angled at 10° off vertical and the fountain trajectories were recorded on video. The team also investigated the total mass lost in the fountain and the influence of the sweet's surface roughness.
The results showed that Diet Coke created the most spectacular explosions with either fruit or mint Mentos, the fountains travelling a horizontal distance of up to 7 metres.
But caffeine-free Diet Coke did just as well, suggesting that caffeine does not accelerate the reaction, at least at the normal levels in the drink.
Measurements of the pH of the Coke before and after the experiments showed that its acidity did not change, ruling out the idea that a simple acid-base reaction drives the fountains.
Instead, the vigour of the jets depends on various factors that affect the growth rate of carbon dioxide bubbles.
The rough, dimply surfaces of Mentos encourage bubble growth because they efficiently disrupt the polar attractions between water molecules, creating bubble growth sites.
Rough candy
"Water molecules like to be next to other water molecules, so basically anything that you drop into the soda that disrupts the network of water molecules can act as a growth site for bubbles," Coffey told New Scientist. "And if you have rough candy with a high ratio of surface area to volume, then there's more places for the bubbles to go."
Low surface tension also helps bubbles grow quickly. Measurements showed that the surface tension in water containing the sweetener aspartame is lower than in sugary water, explaining why Diet Coke creates more dramatic fountains than sugary Coke.
Another factor is that the coatings of Mentos contain gum arabic, a surfactant that further reduces surface tension in the liquid. Rough-surfaced mints without the surfactant did not create such large fountains.
Mentos are also fairly dense and sink rapidly, quickly creating bubbles that seed further bubbles as they rise. Crushed Mentos that fell more slowly created puny fountains that only travelled about 30 centimetres.
"Middle-school teachers are getting their students out onto the baseball field next to their school and doing this reaction, and their students love it," says Coffey. "It's a great way to get students excited about science and learn something new."
Un pouco de ciencia: Mentos e Cocacola de Dieta
Como ben sabedes, estamos coñecendo na clase os tres estados da materia:sólidos, líquido e gasoso. Durante a explicación da semana pasado xurdiu unha cuestión
c@s alumn@s de 1ºB: faláronme dunha curiosa reacción que se produce entre os mentos e a cocacola, polo que andei a investigar un pouco e descubrín que o efecto ten maior magnitude con coca diet. Aquí deixo as probas de dúas persoaxes que demostran que efectivamente, reacciona. A pregunta é....por qué???
c@s alumn@s de 1ºB: faláronme dunha curiosa reacción que se produce entre os mentos e a cocacola, polo que andei a investigar un pouco e descubrín que o efecto ten maior magnitude con coca diet. Aquí deixo as probas de dúas persoaxes que demostran que efectivamente, reacciona. A pregunta é....por qué???
Suscribirse a:
Entradas (Atom)