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Water for life
Nature & Environment

Water for life

...c) white crystals of the fertiliser sodium nitrate dissolving in a beaker of water. The image in (b) is a still taken from the video sequence Elements and Compounds which you will watch in Activity 1. It shows a bag of Chilean nitrate of soda which is sodium nitrate Much of this course is devoted to exploring the smallest water particle - a water molecule - what it is and...
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Level 1: Introductory 15 hrs
Energy in buildings
Nature & Environment

Energy in buildings

...C). Space heating is a prime target for energy efficiency programmes. There is a considerable potential for using some of the low temperature waste heat from power stations for heating buildings using combined heat and power generation (CHP), as is widely done in countries such as Denmark. Of the energy use in buildings about two-thirds was used in the domestic sector and...
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Level 3: Advanced 10 hrs
Fundamentals of accounting
Money & Business

Fundamentals of accounting

...c.1/3 Answer 33.33% d.0.03 Answer 3% e.1/10 Answer 10% f.1 1/4 Answer 125% (i.e. 100 x 1.25) A company sells its product for £65 per unit. How much will it sell for if the customer negotiates a 20% discount? Answer £65 x (1 – 0.2) = £52 If a second product is sold for £36.18 including 20% value added tax, what is the net price before tax? Answer £36.18 / 1.2 =...
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Level 1: Introductory 8 hrs
Week 1 Civilisations: The debate
History & The Arts

Week 1 Civilisations: The debate

...c. 23000 - 20000 BC Welcome to the first post-viewing discussion of Civilisations. I was one of the OU's academic consultants on the series and for close to two years now we have been watching this hugely amibtious series develop. Tonight's episode was the first of nine that are going to take you chronologically all the way from cave paintings up to the present day, in a...
View activity Week 1 Civilisations: The debate
Activity 5 mins
Election days: 1908 - Churchill challenged by the women
History & The Arts

Election days: 1908 - Churchill challenged by the women

...C H Pankhurst writes from the office of the National Women's Social and Political Union: "Except that we regard it as a sign that our campaign against the Government is having its effect, we attach no value to Mr. Churchill's assertion that he will use his influence with the Government in the interests of women's suffrage. "Sir Henry Campbell-Bannerman is in favour of...
View article Election days: 1908 - Churchill challenged by the women
Article 5 mins
Fasteners
Science, Maths & Technology

Fasteners

...C) Recommended material Bolts Nuts -20 to 300 Mild or carbon steel Mild carbon steel -100 to 400 1% chromium-molybdenum steel Carbon-molybdenum steel 0 to 450 1% chromium-molybdenum steel (higher Mo) Carbon steel 0 to 500 12% chromium steel Carbon-molybdenum steel 0 to 520 1% chromium-molybdenum-vanadium steel Carbon-molybdenum steel 0 to 565 1%
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Article 10 mins
Hot rolling
Science, Maths & Technology

Hot rolling

...C. Shaped rolling is used to produce shaped cross sections by passing the hot metal stock through a series of rotating sets of rolls with appropriately shaped grooves in the rolls. Transverse rolling differs from flat and shaped rolling in that the objective is to produce a component with a varied cross section. Other variations are called cross rolling (or wedge...
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Article 5 mins
Orbital forging
Science, Maths & Technology

Orbital forging

...Minimum practical forging thicknesses: conventional 5 mm orbital 2.5 mm Thickness tolerances on warm forging of steel at 700–800˚C are ±0.15 mm. Reduced oxide scale formation compared with hot forging applications. Orbital forging should produce 25% material savings and 50% reduced energy costs. See Also: Upset forging, Hot forging (open die) and Powder forging....
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Article 5 mins