295 search results
Introduction to active galaxies
Science, Maths & Technology

Introduction to active galaxies

...LE = constant × M, where LE is the Eddington limit. Full calculations give This is the upper limit of the luminosity of a black hole of mass M - the luminosity can be lower than LE but not higher. The larger the mass M, the greater the value of LE. In fact, this is only a rough estimate. It assumes that the accreting material is ionized hydrogen (a good assumption) and...
View course Introduction to active galaxies
Level 2: Intermediate 20 hrs
Succeed with maths: part 1 Badge icon
Science, Maths & Technology

Succeed with maths: part 1

...Les are having some friends round for dinner. There will be six of them sitting round their circular table, but unfortunately not all their friends get on well and so they want to arrange a seating plan that will keep everyone happy. Read the conversation between Sandy and Les and then work out how they can seat their guests. Sandy Faisal doesn’t get on with Gareth, so...
View course Succeed with maths: part 1
Level 1: Introductory 24 hrs
The many guises of the emperor Augustus
History & The Arts

The many guises of the emperor Augustus

...du Louvre, Paris). Discussion The general clothing of Roman soldiers in the time of Augustus as illustrated in Figure 15 consisted of a short-sleeved, knee-length tunic that was belted at the waist. The image also shows that the belt could be used to hang weaponry from. Over the tunic, soldiers wore a rectangular cloak called a sagum that was fastened at the right...
View course The many guises of the emperor Augustus
Level 1: Introductory 6 hrs
Communication and working relationships in sport and fitness Badge icon
Health, Sports & Psychology

Communication and working relationships in sport and fitness

...Le Mans 24-hour race to compete. Watch the video of Chris Hoy’s motor racing pit-stop but please be warned that there is some swearing in this clip so carefully choose where you watch it so as not to cause offence to others. In addition to Chris Hoy who is driving, there are two other main people interacting: the race engineer (coordinating radio communications) and the...
View course Communication and working relationships in sport and fitness
Level 1: Introductory 24 hrs
Nationalism, self-determination and secession
Society, Politics & Law

Nationalism, self-determination and secession

...Le Pen in becoming one of the final two candidates in the run-off for the French presidency in 2002, and the rise in votes for the far right in Switzerland, Austria, Denmark, Belgium and The Netherlands – do hint at or openly articulate such claims. More progressive forms of nationalism, which were more common throughout the process of decolonisation in the twentieth...
View course Nationalism, self-determination and secession
Level 2: Intermediate 8 hrs
Modern slavery
Society, Politics & Law

Modern slavery

...sang Whispering Hope. A line from that song stays in my mind. "When the dark midnight is over, watch for the breaking of day." Let me hope that this day and this debate – excuse me – heralds a new dawn for all those who fear that the dark midnight might never end. Magdalene Laundries: Enda Kenny Delivers State Apology (BBC News, 2013)...Modern slavery: 5 Looking to...
View course Modern slavery
Level 1: Introductory 15 hrs
Exploring Homer’s Odyssey
History & The Arts

Exploring Homer’s Odyssey

...sang of the Achaeans’ return home, a bitter ordeal, sent them by Pallas Athena after they left Troy. In her upstairs room the daughter of Icarius, circumspect Penelope, heard and understood his divinely inspired song, and came down the tall staircase from her part of the house, [330] not on her own, but attended by two women servants. When she, glorious among women,...
View course Exploring Homer’s Odyssey
Level 1: Introductory 6 hrs
Aquatic mammals
Nature & Environment

Aquatic mammals

...sang their low-frequency songs across the oceans of the world...Aquatic mammals: 5 Human impact - In the introduction to this course, you considered the success of the mammals as a whole. You would probably also agree that the aquatic mammals are a successful group too. However, there is another mammal that has been successful in a different way and has challenged the...
View course Aquatic mammals
Level 1: Introductory 5 hrs