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3.18 Subtraction of negative numbers

Next consider subtraction of a negative number. In terms of Thomas’s piggy bank, subtracting a negative number is the same as taking away one of his IOUs. If his mother says ‘you have been a good boy today so I’ll take away that IOU for £3’ this is equivalent to him being given £3.

So, − (3) = 3. Does this correspond with the number line interpretation of subtracting a negative number?

Consider the evaluation of 8 − 3. Continue to think o
Author(s): The Open University

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Editing files and Emacs
This emacs lecture is given as part of the course G51UST, Unix Software Tools. The course gives an introduction to the Unix operating system. It teaches students how to use the Command Line Interface that is part of Unix and also teaches them how to write shell, sed and awk. In doing so the course covers the use of editors such as Emacs and vi with which the students can write their scripts. It is presented in 3 formats: * Screencast (video of the lecturer and presentation slides) * Au
Author(s): Hopkins Gail

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Except for third party materials (materials owned by someone other than The University of Nottingham) and where otherwise indicated, the copyright in the content provided in this resource is owned by

Retail management and marketing
How do retailers decide where to locate new stores? Why do consumers behave in a particular manner? How does a frozen pea get from harvest to a supermarket freezer? How do independent and online businesses compete with high street chains? These are just some of the many questions answered throughout this collection of video material that looks in depth at the dynamic and innovative retail industry, and what the future might have in store for retailers and businesses alike. Store operations, glob
Author(s): The iTunes U team

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Dr. Paul Kan- Crime in Latin America
Dr. Paul Kan delivered a talk on crime in Latin America and talked at great length of the import role Mexico plays for the U.S. as part of the first resident course for the Distance Education Class of 2014.
Author(s): No creator set

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A Tool for Typological Analysis
Any design problem is faced drawing from the architect's knowledge both case knowledge and general knowledge. One type of the latter is abstracted from a multiplicity of cases of which the common features are recognised in such a way as to single out a prototype representing in the best way a class of architectural objects. If applied to a set of residential buildings and to the flats in them the analysis is typological and it is one of the fundamental ways of acquiring general knowledge to be u
Author(s): Alaimo, G., Pellitteri, G. and Scianna, A.

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Learning outcomes

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

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3.4.2 Radiological aspects

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

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2.1 Surfaces in space

In Section 2 we start by introducing surfaces informally, considering several familiar examples such as the sphere, cube and Möbius 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
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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.

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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

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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

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3-point bending under a circular polariscope of annealed polycarbonate bar, close up
Close up of annealed, polycarbonate bar undergoing 3-point bending under a circular polariscope. From TLP: Introduction to photoelasticity, http://www.msm.cam.ac.uk/doitpoms/tlplib/photoelasticity/index.html
Author(s): DoITPoMS, University of Cambridge

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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

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4.2.5 Focusing

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).

Introduction

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

4.2 P is for Presentation

By presentation, we mean, the way in which the information is communicated. You might want to ask yourself:

  • Is the language clear and easy to understand?

  • Is the information clearly laid out so that it is easy to read?

  • Are the fonts large enough and clear?

  • Are the colours effective? (e.g. white or yellow on black can be difficult to read)

  • If there are graphics or photos, do they help the infor
    Author(s): The Open University

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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)
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4.1 Your carbon footprint

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

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Photosynthesis
This video segment from Interactive NOVA: "Earth" explores the history of plant biology. It takes the viewer from the earliest scientific hypotheses that plants ate dirt, to our present-day understanding of photosynthesis, the process by which plants use the sun's energy to convert carbon dioxide and water into carbohydrates, a storable form of chemical energy. Closed captioning included. Run time 02:25.
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