Amplitude refers to the size of a sine wave. It can be defined in various ways, but a standard definition is that it is the maximum value of a wave's departure from its average value. (The average value of a sine wave lies midway between its peaks and troughs.) The size of a sine wave is sometimes also expressed as a peak-to-peak amplitude, which is the vertical distance from peak to trough.

Root-mean-square (r.m.s.) amplitude is a way of specifying the size of a sine wave so that compa
Author(s): The Open University

Virtual Maths - Numbers, Opposite angles simulation tool
Interactive simulation tool demonstrating the angles on a 360 degree wheel
Author(s): Leeds Metropolitan University

1.050 Solid Mechanics (MIT)
1.050 is a sophomore-level engineering mechanics course, commonly labelled "Statics and Strength of Materials" or "Solid Mechanics I." This course introduces students to the fundamental principles and methods of structural mechanics. Topics covered include: static equilibrium, force resultants, support conditions, analysis of determinate planar structures (beams, trusses, frames), stresses and strains in structural elements, states of stress (shear, bending, torsion), statically indeterminate sy
Author(s): Bucciarelli, Louis

Accountants do not, traditionally, deal with qualitative data, such as whether a customer was happy or sad, or whether it looked like it would rain when a customer bought an umbrella.

## Activity 9

Why do you think
Author(s): The Open University

7.343 Neuron-glial Cell Interactions in Biology and Disease (MIT)
The main goal of this seminar will be to study the nervous system from the perspective of neuron-glia interactions. In each class, we will focus on one type of glial cell and discuss its origin, classification and function within the nervous system. Current findings concerning diseases associated with each type of glial cell will be discussed. This course is one of many Advanced Undergraduate Seminars offered by the Biology Department at MIT. These seminars are tailored for students with an inte
Author(s): Akten, Bikem

This section introduces an alternative to basing user research on yourself. This is observation of experienced and inexperienced users either in experimental or natural situations.

One way around the difficulties of basing research on oneself is to observe other people acting as users and to choose naive or different kinds of experienced users, depending on what information you want to gather.

Begin by identifying those experienced users who will be able to provide you with releva
Author(s): The Open University

Introduction to child psychology
Childhood is a time of rapid growth and development, and studying these changes is endlessly stimulating. In this free course, Introduction to child psychology, you will be introduced to the discipline of child psychology and some of the key questions that guide the understanding of childhood. These questions include 'What influences children's development?' and 'How do psychologists study the physical and cognitive changes that occur during childhood?' As you work through this material, you wi
Author(s): Creator not set

The content acknowledged below is Proprietary (see terms and conditions) and is used under licence.

Grateful acknowledgement is made to the following sources for permission to reproduce material in this course:

Course image: Author(s): The Open University

## Activity 4

Look back at Table 1 and identify the foods that contain vitamin A. On the basis of this information, try to predict where vitamin A is stored in the human body.

Author(s): The Open University

How To Make a Battery From a Potato
Following on from Edison's first lightblub moment back in 1879, the OU's Stephen Serjeant experiments with an alternative power source - the humble potato. Video experiment explains the process and why you need more than one potato. Grades 5-12. Includes closed captioning.  2:31 min.
Author(s): No creator set

The Gothic and the grotesque replaced classical reason, order and regularity with the irrational, the irregular and the deformed. Delacroix was drawn to them as a means of breathing new life into artistic expression. He was attracted to English and German literature, particularly Shakespeare and Goethe – because, to the unified, clearly defined aesthetic categories of the classical, they opposed the fractured and hybrid genres less susceptible to categorisation of any kind. Shakespeare mixe
Author(s): The Open University

Piccadilly, London. An engraving showing Piccadilly from Coventry Street with Tichborne Street visible to the right. Coloured engraving from the Mayson Beeton Collection.

Author(s): No creator set

Solving Trigonometric Equations
OpenStax College
In this section, you will: Solve linear trigonometric equations in sine and cosine. Solve equations involving a single trigonometric function. Solve […]

Author(s): No creator set

The discovery that quantum mechanics permits the tunnelling of particles was of great significance. It has deep implications for our understanding of the physical world and many practical applications, particularly in electronics and the developing field of nanotechnology. This section introduces some of these implications and applications. Applications naturally involve the three dimensions of the real world, and realistic potential energy functions are never perfectly square. Despite these
Author(s): The Open University

The polar bear has become an international climate change icon. But how much is known about this bear, its habitat and life? This course will talk about the role of language, but by way of introduction how about the name of this bear? To me it is the polar bear; to a German it is an Eisbär (ice bear) and to a French person it is an ours blanc (white bear). In these three examples the bear is referred to as polar, white, or an ice bear – eminently sensible. The Latin name for
Author(s): The Open University

After studying this course, you should be able to:

• understand better the principles of accelerated learning

• develop some techniques to use in the classroom

• change ways of teaching to use these techniques.

Author(s): The Open University

En esta actividad va a leer distintas citas de personas famosas. Utilice un diccionario bilingüe si encuentra palabras que no entiende.

1 Lea las siguientes citas y utilice las palabras que apare
Author(s): The Open University

Derived copy of Ecology of Ecosystems
Shannon McDermott
By the end of this section, you will be able to: Describe the basic types of ecosystems on Earth Explain the methods that ecologists use to study ecosystem structure and […]

Author(s): No creator set

It used to be thought that a photograph could provide proof of an event – someone could be caught red-handed by a photograph, as proof of their guilt. 'The camera never lies', it was said. If you have a digital camera and have been 'touching up' photographs on your home computer you will know that this is far from true now. It is easy to lie with a digital photograph.

The idea that the camera never lies has always been a myth, however. As far back as 1917 the photographs of the Cottin
Author(s): The Open University

We shall discuss monomeric G proteins (also called small G proteins or small GTPases) separately from the trimeric G proteins for three reasons: their upstream activators are different, they tend to have different target proteins, and they commonly operate within different signalling pathways.

• What structural features and activities do monomeri
Author(s): The Open University