After studying this course, you should be able to:

• appreciate the concept of force, and understand and model forces such as weight, tension and friction

• model objects as particles or as rigid bodies, and the forces that act on an object in equilibrium

• use model strings, rods, pulleys and pivots in modelling systems involving forces

• understand and use torques

• model and solve a variety of problems involving systems in equ
Author(s): The Open University

Environmental radiation comes from a range of naturally occurring and anthropogenic sources, with the former estimated to contribute more than 98% of the radiation dose experienced by people (excluding medical exposure). Any exposure to radiation can lead to cancer, and the greater the exposure, the greater the risk.

The contribution that drinking water makes to radiation intake is very small, and is due largely to naturally occurring radionuclides (isotopes of an element which are unst
Author(s): The Open University

In Section 2 we start by introducing surfaces informally, considering several familiar examples such as the sphere, cube and MÃ¶bius band. We also illustrate how surfaces can be constructed from a polygon by identifying edges. A more formal approach to surfaces is presented at the end of the section.

Figure 3 shows
Author(s): The Open University

15.348 Doctoral Seminar in Research Methods II (MIT)
A large proportion of contemporary research on organizations, strategy and management relies on quantitative research methods. This course is designed to provide an introduction to some of the most commonly used quantitative techniques, including logit/probit models, count models, event history models, and pooled cross-section techniques.
Author(s): Sorensen, Jesper B.

To take a definite case, consider a car moving along a straight horizontal road. The car can be modelled as a particle by supposing the particle to be located at, say, the midpoint of the car. It is clearly convenient to measure the progress of the car with respect to the road, and for this purpose you might use the set of uniformly spaced red-topped posts along the right-hand side of the road (see Figure 5). The posts provide a way of assigning a unique position coordinate to the car
Author(s): The Open University

21F.084J Introduction to Latin American Studies (MIT)
This course is designed as an introduction to Latin American politics and society for undergraduates at MIT. No background on the region is required. Overall workload (reading, writing, class participation, and examinations) is similar to that of other HASS-D courses. Many of the themes raised here are covered in greater detail in other courses: 21F.020J (New World Literature), 21F.716 (Introduction to Contemporary Hispanic Literature), 21F.730 (Twentieth and Twentyfirst-Century Spanish American
Author(s): Lawson, Chappell

Shear deformation in bubble raft
Bubble raft undergoing shear deformation. The direction along which dislocations generally move is that with the highest resolved shear stress. From TLP: Introduction to dislocations, http://www.msm.cam.ac.uk/doitpoms/tlplib/dislocations/dislocation_motion.php
Author(s): DoITPoMS, University of Cambridge

Reactivity is not spread evenly over a molecule; it tends to be concentrated at particular sites. The consequences of this idea are apparent in the chemistry of many elements. However, in organic chemistry, the idea has proved so valuable that it receives specific recognition through the concept of the functional group. Structure 6.1 shows the abbreviated structural formula of hexan-1-ol, an alcohol.

Author(s): The Open University

18.314 Combinatorial Analysis (MIT)
This course analyzes combinatorial problems and methods for their solution. Prior experience with abstraction and proofs is helpful. Topics include: Enumeration, generating functions, recurrence relations, construction of bijections, introduction to graph theory, network algorithms and, extremal combinatorics.
Author(s): Postnikov, Alexander

Focusing is done by adjusting the size of the gap between the lens and the light sensor. To get distant objects in focus, the gap needs to be smaller than that required for close objects (see Figure 7 below).

This course asks the reader to consider the experience of grief and bereavement and in particular the extent to which grieving people need professional help. The course considers the evidence for the effects of grief and the extent to which current ways of responding are helpful.

This OpenLearn course provides a sample of level 2 study in Health & Social Ca
Author(s): The Open University

Arctic Tern Facts: 24 Facts
(05:15)
Author(s): No creator set

Chalk Artist: Julian Beever
This CBS News video shows the chalk art of Julian Beever. The photographs of his art is amazing. The artist talks about his art and how he starts his work. Because of the Internet his work is well known. First, the art is drawn in miniature then he uses rope to plot out his drawing.  The first day is the hardest.  (05:20)
Author(s): No creator set

Most of this section requires you to continue using the Quick Carbon Calculator (linked in the box below).

If you've completed the carbon calculator , you'll have a good idea of your carbon footprint and the relative contribution to the total load made by different components of consumption. You'll also know how your footprint compares to that of an average person in the UK.

If you live outside the UK, you may have used a calculator that provides somewhat different information abo
Author(s): The Open University

21W.784 Becoming Digital: Writing about Media Change (MIT)
"Becoming Digital" traces the change in practice, theory and possibility as mechanical and chemical media are augmented or supplanted by digital media. These changes will be grounded in a semester length study of "reports from the front." These reports, found and introduced by students throughout the semester, are the material produced by and about soldiers and civilians on the battlefield from the introduction of wet photography during the Crimean and Civil Wars to contempor
Author(s): Miller, Ben

21W.747-1 Rhetoric (MIT)
This course is an introduction to the history, the theory, the practice, and the implications (both social and ethical) of rhetoric, the art and craft of persuasion. This semester, many of your skills will be deepened by practice, including your analytical skills, your critical thinking skills, your persuasive writing skills, and your oral presentation skills. In this course you will act as both a rhetor (a person who uses rhetoric) and a rhetorician (one who studies the art of rhetoric).
Author(s): Strang, Steven

Making Sense of Leadership: A new view - Seeing, being and doing.
Professor Nigel Nicholson argues that women are disadvantaged by the persistence of organisational forms and competitive promotion systems designed by men so that they can play games of dominance hierarchy games, pretending they are meritocracies.
Author(s): No creator set

S Churchill
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Author(s): No creator set

Deze jaarlijkse zomerkrant van het Vlaams Instituut voor de Zee (VLIZ) en de provincie West-Vlaanderen informeert de kusttoerist met hapklare weetjes over zeegebonden …

Author(s): No creator set

21F.311 Introduction to French Culture (MIT)
Ce cours est une introduction à la culture et la société françaises depuis la Révolution, mais surtout à partir du Second Empire. Nous tacherons de cerner ce qui définit la singularité francaise dans une perspective historique. Nous commencerons avec la notion "d'exception francaise" et de ce qui la constitue depuis la Révolution (La République, L'Universalisme, La Laicité, etc.) Nous explorerons l'impact de l
Author(s): de Courtivron, Isabelle