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Try some yourself

1 Find the area of a circle of (a) radius 8 cm, and (b) radius 15 m.

Answer

  • (a)

    Author(s): The Open University

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    Is a Subprime Auto Loan Crisis Brewing?
    A record seven million Americans are at least 90 days late on their auto loan payments. What does that mean for the broader economy?
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    South Korea stages security drill
    South Korean police and army hold a drill to demonstrate their readiness against possible attack. Rough Cut (no reporter narration). Subscribe: http://smarturl.it/reuterssubscribe More updates and breaking news: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial, national, and international news. For over 160 years, R
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    Virtual Maths - Numbers, Find the angle quiz
    Interactive simulation quiz, 8 questions, Find the Angle using the simulation and enter the answers
    Author(s): Leeds Metropolitan University

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

    11.2 Frequency discrimination

    Some findings indicate that, for moderate loudness levels, humans can detect a frequency change of about 1 to 3 Hz for frequencies up to about 1000 Hz. Figure 37 shows a plot of the smallest frequency difference for which two tones can be discriminated for a number of reference tones. You can see from the figure that up to about 1000 Hz, the D
    Author(s): The Open University

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    4.8 Assess and review again

    If you've been following the stages of our problem-solving map, then the chances are you're ahead of me here (Figure 19). Yes, if it works, hurrah; if it doesn't then off we go again, all the way back to 'possible solutions' and selecting the best of the rest. Or maybe even going back to the beginn
    Author(s): The Open University

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    Energy resources: Solar energy
    Energy from sources other than fossil and nuclear fuels is to a large extent free of the concerns about environmental effects and renewability that characterize those two sources. Each alternative source supplies energy continuall, whether or not we use it, and most have their origins in energy generated outside the Earth, yet the potential of each is limited by its total supply set against its rate of use. The Sun will radiate energy until it ceases thermonuclear fusion, in around 5 billion yea
    Author(s): Creator not set

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    Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

    Elizabeth I - Documentary Part 8
    This part of the documantary begins describing Elizabeth I 's relationship with Lord Robert Dudly and how Cecil and other advisors opposed it. After Dudly's wife was found dead he was sent out of court. In 1562 Elizabeth is terribly ill. There is no successor. In Scotland, Mary Queen of Scots had returned from exile. She had grown up in France as a Catholic. She aimed at the throne of England. As Elizabeth recovered she decided to name a Protector in the case of her death. She named Robert Dudly
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    Climate change
    Human societies have to take urgent action to end their dependences on fossil fuels. We have to alter the whole path of our development and decision making in order to make our societies both environmentally adaptable and sustainable. This unit takes on the task of trying to chart some of the ways in which it might be possible. First published o
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    Merkle Chairman and CEO David Williams: Lessons in Leadership
    "Have a Deep Keel: Lessons in Leadership in an Ever-Changing World" David Williams, Chairman and Chief Executive Officer of Merkle, Inc. speaks to Darden students, faculty and staff. Merkle Inc. is the nation’s largest and fastest-growing independent Customer Relationship Marketing (CRM) agency. The event was co-sponsored by the Darden Marketing Club and is part of the 2014-2015 Leadership Speaker Series, “Leaders that inspire innovation, collaboration and growth." Williams acquired Merkl
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    Mandelson: Enterprise-led Recovery
    Lord Peter Mandelson gave a key-note speech following an invitation by the Oxford Centre for Entrepreneurship and Innovation, Said Business School. In his address he used an imaginary female entrepreneur to underline his argument that markets and ministerial policies need to go hand in hand in order to create the right conditions for an enterprise-led recovery.
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    Babbage: February 19th 2014


    Author(s): The Economist

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    Easby Abbey J870557

    EASBY ABBEY, North Yorkshire. Refectory from the South West.


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    2.6 Line symmetry

    Look at the shapes below. The symmetry of the shape on the left and its relationship to the shape on the right can be thought of in two ways:

    • Fold the left-hand shape along the central line. Then one side lies exactly on top of the other, and gives the shape on the right.

    • Imagine a mirror placed along the central dotted line. The reflection in the mirror gives the other half of the shape.

    Author(s): The Open University

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    3.1 Speech perception

    Now that we have examined the processes involved in understanding a sentence in some detail, we will turn to the issue of how the brain achieves the task. We will begin with the initial capture and analysis of the speech signal.

    Vibrations in the air are channelled by the structure of the external ear into the ear canal (Author(s): The Open University

    4.4 What was innovative about the telephone?

    The most obvious innovative aspect was that speech was being transmitted, so in principle anyone could use a telephone for communication. The use of the telegraph required skilled operatives. A message had to be translated into the dots and dashes of Morse code and transmitted using a single keypad making and breaking the connection in an electrical circuit. At the other end of the wire another Morse operator translated the received clicks into the words of the message. With the telephone no
    Author(s): The Open University

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    Human Genetics and the Image of God
    Public lecture given by Dr Graeme Finlay
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    6.5 Multienzyme complexes

    In free solution, the rate of an enzyme-catalysed reaction depends on the concentration of the enzyme and the concentration of its substrate. For an enzyme operating at suboptimal concentrations, the reaction is said to be diffusion-limited, since it depends on the random collision of the enzyme and substrate. If we consider a metabolic pathway, the product of one reaction is the substrate for the next enzyme in the pathway. Direct transfer of a metabolite from one enzyme to another wo
    Author(s): The Open University

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    15.615 Law for the Entrepreneur and Manager (MIT)
    This course provides a basic understanding of legal issues that corporations face during their existence. The course starts by providing the basic building blocks of business law. We then follow a firm through its life cycle from its "breakaway" from an established firm through it going public. The materials covered during 15.647 (the first half of the semester) emphasize the organization and financing of the company. In the second half of the course we examine a broad array of law-sen
    Author(s): Akula, John

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    Content within individual OCW courses is (c) by the individual authors unless otherwise noted. MIT OpenCourseWare materials are licensed by the Massachusetts Institute of Technology under a Creative C

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