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2.7 Summary

Pressure in the air is related to how closely packed the molecules are. Other things being equal, more closely packed molecules are at a higher pressure than more dispersed molecules. Sound is associated with fluctuations of the air pressure caused by local disturbance. Fluctuations of pressure travel outwards away from the disturbance, carrying energy imparted by the disturbance.

A simple form of local disturbance to air pressure is a vibrating tuning fork. It generates a pressure wave
Author(s): The Open University

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Changing Decimals to Percents (sv)
How to convert decimals to percentages.This video by Duane Habecker is part of the video collection at NextVista.org (http://nextvista.org), a proud partner of Curriki.
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1.1.1 Where do we get our energy from?

The world's current energy systems have been built around the many advantages of fossil fuels, and we now depend overwhelmingly upon them. Concerns that supplies will 'run out' in the short-to-medium term have probably been exaggerated, thanks to the continued discovery of new reserves and the application of increasingly advanced exploration technologies. Nevertheless it remains the case that fossil fuel reserves are ultimately finite. In the long term they will eventually become depleted and
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Regulating Technologies
Roger Brownsword argues that the legal community should be concerned to contribute to debates about the implications and regulation of rapidly developing and converging technologies (eg ICTs, biotech / nanotech). Roger Brownsword argues that the emergence of a raft of rapidly developing technologies (ICTs, biotechnologies, nanotechnologies and neurotechnologies), together with the prospect of significant convergence between some or all of these technologies, should be of major concern to the leg
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Horrors of WWll
This video contains a slide show of photos from WWll with a ballad playing in the background.
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Tom Fowler
Describes training to be an actuary and working as a Benefits Consultant.
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Six Traits of Writing
This 20 minute lecture is on using the Six Traits of Writing. It includes student examples and moves slowly through the traits.
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This Day in History December 28: First Commercial Movie Screened
On this day in 1895, the world's first commercial movie screening takes place at the Grand Cafe in Paris. The film was made by Louis and Auguste Lumiere, two French brothers who developed a camera-projector called the Cinematographe. The Lumiere brothers unveiled their invention to the public in March 1895 with a brief film showing workers leaving the Lumiere factory. On December 28, the entrepreneurial siblings screened a series of short scenes from everyday French life and charged admission fo
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9th Dialogue on Science 2010 - Opinions of the participants Part 2
Challenging Democracy - 9th Dialogue on Science of the Academia Engelberg Foundation 2010 During this year’s Dialogue on Science held in Engelberg in mid October, experts from various disciplines and countries with different forms of government analyzed the concept of democracy. You can find the reportings, impressions, audio- and video-files of the 9th Dialogue on Science on the website: http://www.academia-engelberg.ch/conference_2010.php5. Visit also the Blog on http://blog.academia-eng
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Virtual Maths - Basic Structures, bending moment point of load
Interactive simulation demonstrating the bending moment at point of load
Author(s): Leeds Metropolitan University

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http://creativecommons.org/licenses/by-nc-sa/2.0/uk/

Exhausted by Scandal: ‘Dieselgate’ Continues to Haunt Volkswagen
The SEC is after the German automaker’s CEO for allegedly defrauding bondholders by not coming clean on its emissions “defeat device.”
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Rights not set

2.1 Overview

Session 2 discusses the scattering of a particle using wave packets. We shall restrict attention to one dimension and suppose that the incident particle is initially free, described by a wave packet of the form

This is a superposition of de Broglie w
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2.3.1 Soil pH

pH (a measure of acidity or alkalinity) is an important environmental factor, particularly in soils. Soil is derived partly from accumulated decaying vegetation and partly from broken up fragments of the underlying rocks. Soil pH is determined by both these components and also by the water that fills the spaces between solid soil particles.

How might you expect the pH of soil overlying limestone (or chalk, which is a particular form of limestone) to compare with that of soil overlying s
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The Religious and Ethical Beliefs of Scientists
Talk given by Dr Elaine Howard Ecklund as part of summer course 7
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1.2.1 The Beveridge report

The architect of much of this reform in the field of social welfare was William Beveridge. His report entitled ‘Social Insurance and Allied Services’ was compiled as the war was at its height (Beveridge, 1942). In it Beveridge set out a plan to put an end to what he called the ‘five giants’ – Want (today we would call it poverty), Disease, Ignorance, Squalor and Idleness (unemployment). The centrepiece was a state-run system of compulsory insurance. Every worker, by contribut
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Introduction
Alexander Holmes

Some Rights Reserved

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Introduction

In recent years, scientists have made huge gains in their understanding of how genes can be altered and transferred from one organism to another - but that knowledge has been acquired amidst controversy and concern. The deep ethical concerns that have resulted from the emergence of genetic manipulation are explored in this course. We begin with an examination of the basic structure and function of genes. A number of pioneering examples and techniques are explored, helping to explain why our p
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The Religious Beliefs of Scientists - a Sociological Analysis
Prof. Elaine Howard Ecklund : Seminar
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Plan National de formation : École et droit - Journée de sensibilisation pour une formation ...

L’objectif principal de cette journée de sensibilisation à la culture juridique est d’aider les personnels de l’école ou de l’EPLE à prendre une décision éclairée lorsqu’une situation professionnelle met en jeu les principes du droit. Déjà au cours des années 70, André Legrand nous expliquait, dans son ouvrage L’école dans ...
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11.5 Programming languages

A computer program is written in a programming language and contains the instructions that tell the computer what to do. Developers write new software using specialised programming languages. The resulting programs (or 'source code') can be converted into the low-level instructions understood by the processor. There is a wide range of programming languages to suit different types of task; if you look at advertisements for programming jobs in newspapers or online you will get an idea of
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