Pop Rockets
Students design and build a paper rocket around a film canister, which is used as the engine. An antacid tablet and water are put into the canister, react to form carbon dioxide gas, and act as the pop rocket’s propellant. With the lid snapped on, the continuous creation of gas causes pressure to build up until the lid pops off, sending the rocket into the air. The pop rockets demonstrate Newton’s third law of motion: for every action, there is an equal and opposite reaction.
Newton Rocket Car
The purpose of this activity is to demonstrate Newton’s third law of motion — which states that every action has an equal and opposite reaction — through a small wooden car. The Newton cars show how action/reaction works and how the mass of a moving object affects the acceleration and force of the system. Subsequently, the Newton cars provide students with an excellent analogy for how rockets actually work.
Premiers entretiens du jeu de paume - séance inaugurale 2
Premiers entretiens du jeu de paume - séance inaugurale
L’Université de tous les savoirs et Le Château de Versailles présentent
11h Conférences inaugurales - deuxième partie
L'élargis
les Premiers entretiens du Jeu de Paume
La démocr@tie d’opinion
Du siècle des lumières à la démocratie des courts –circuits
Vendredi 18, samedi 19 et dimanche 20 juin 2010
MILDT 2010 - Nouvelles mesures législatives, réglementaires
Plan gouvernemental de lutte contre les drogues et les toxicomanies 2008-2011.
Nouvelles mesures législatives, réglementaires
Sylvie Mouchel (Ministère de la justice)
Mission Interministérielle de la Lutte contre la Drogue et les Toxicomanies.
Formation interministérielle des formateurs en matière de drogues et de toxicomanies.
Session interministérielle visant la création d'une culture commune aux différents acteurs de l'Etat.
The mechanisms of boiling (video)
Boiling is an effective way to remove heat. It is used as cooling medium in many industrial power such as power plants. The mechanisms governing the different regimes occurring during the boiling of a liquid usually are complex and often intertwined. It is important to know them and identify them in the laboratory. In particular, the detailed understanding of the boiling crisis, well known and feared for the damage that can result in practice is of primary importance. (For the boiling of a s
Асимптоти
Liljana Stefanovska
Се дефинира поимот за асимптота и се дефинираат три вида асимптоти: вертикална, хоризонтална и коса асимптота.
1.7.1 Protein balance
This Unit studies 'proteins'. Starting with a simple analysis of the molecular make up, the Unit moves on to look at the importance of protein and how they are digested and absorbed
1.8 Summary
This Unit studies 'proteins'. Starting with a simple analysis of the molecular make up, the Unit moves on to look at the importance of protein and how they are digested and absorbed
L'autorité -Yves Michaud (audio)
Une conférence de l'UTLS au lycée
L'autorité par Yves Michaud (philosophe)
Lycée Pasteur (59 Lille)
Cu 21, Sn 79 (wt%), peritectic transformation
This microstructure is generated via a peritectic reaction (L+ε = η), which bears some similarities to the more familiar eutectic reaction (L = α + β). Upon cooling from the liquid phase field, primary ε is formed, which can be seen here as a slightly darker phase than the sheath of η surrounding it. The η sheath is the product of a peritectic reaction between ε and liquid. The peritectic reaction rarely goes to completion, since the formation of η around the ε phase separates it from
Cu 21, Sn 79 (wt%), peritectic transformation
This microstructure is generated via a peritectic′s reaction (L+ε = η), which bears some similarities to the more familiar eutectic reaction (L = α+β). Upon cooling from the liquid phase field, primary ε is formed, which can be seen here as a slightly darker phase than the sheath of η surrounding it. The η sheath is the product of a peritectic reaction between ε and liquid. The peritectic reaction rarely goes to completion, si
West Nile Virus Problem Space
As an emerging disease in the public eye, WNV continues to generate scientific interest as well. Researchers are exploring questions about its origin, evolution, transmission by multiple vectors and host tissues, replication in multiple hosts, viremic period, viral loads, seroconversion and antibody production, detection, vaccine potential, etc. Central to these investigations are the use of molecular data including nucleic acid sequences and the use of bioinformatics.
Fracture surface in a liquid crystalline polymer
Above their melting point, liquid crystalline polymers exhibit a mesophase within which, although able to flow and are not arranged in a crystal, they exhibit long range orientational order. This molecular alignment can be exploited to make high strength and stiffness fibres such as Kevlar, or even mouldable thermotropics such as Vectra. Molecular alignment can also be controlled by an external applied field; a property exploited in liquid crystal displays. This specimen has not had a magneti
Fracture surface in a liquid crystalline polymer
Above their melting point, liquid crystalline polymers exhibit a mesophase within which, although able to flow and are not arranged in a crystal, they exhibit long range orientational order. This molecular alignment can be exploited to make high strength and stiffness fibres such as Kevlar, or even mouldable thermotropics such as Vectra. Molecular alignment can also be controlled by an external applied field; a property exploited in liquid crystal displays. This specimen has not had a magneti
Spherulites in poly-3-hydroxy butyrate (PHB)
Polymer melts often crystallise from heterogeneous nuclei to form ribbon-like lamellae, which have a folded chain molecular structure. They commonly radiate outwards from the nucleation point, to form spherical features called spherulites - which are often quite large. The characteristic Maltese cross pattern, seen when viewed between crossed polars, results from isoclinic fringes formed when one of the principal vibration directions is approximately parallel to the polariser. In some cases
Injection-moulded polypropylene (PP) hinge
The colours in the image are the result of birefringence and relate to the residual strain in the polypropylene. The pattern of strain is indicative of the flow of material during the injection process and reveals the molecular alignment in the constriction which constitutes a hinge. The aligned molecules provide a fatigue resistant, flexible joint. A sprue which has been cut off is also visible in the top left-hand corner of the image.
Injection-moulded polystyrene (PS) case
The colours in the image are the result of birefringence and relate to the residual strain in the polystyrene. The pattern of strain is indicative of the flow of material during the injection process and it highlights the injection point (known as a 'sprue') which can also be identified by a small lump on the surface; the molecular alignment is greatest near this point. Towards the edges of the ruler and along its length, the material becomes more relaxed and as the molecular alignment falls,
Injection-moulded polystyrene ruler
The colours in the image are the result of birefringence and relate to the residual strain in the polystyrene. The pattern of strain is indicative of the flow of material during the injection process and it highlights the injection point (known as a 'gate') at the end of the ruler; the molecular alignment is greatest near this point. Towards the edges of the ruler and along its length, the material becomes more relaxed and as the molecular alignment falls, the retardation of light is less. If
Fe, C 0.5 (wt%) steel, near a decarburised surface
This is a hypoeutectoid steel (one that has a carbon composition below that of the eutectoid). During original cooling from high temperature, some ferrite was formed first on the prior austenite grain boundaries and the remaining carbon-enriched austenite then transformed to pearlite in a eutectoid reaction. The specimen was then exposed to a decarburising atmosphere (just air in this case). This might happen inadvertently, or it could be done deliberately if a softer surface is required for som
