(1 of 2) Measuring the Rotational Inertia of a Bike Wheel
That’s right, we actually measure the rotational inertia of a bicycle wheel. How cool is that? Want Lecture Notes? This is an AP Physics 1 Topic.

Content Times:
0:10 Basic setup
0:44 Free Body Diagram
1:30 Finding net torque
3:10 Finding force of tension
4:51 Linear and angular acceleration
5:42 Uniformly angularly accelerated motion
7:00 What do we nee

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Torque - Mass on Plank with String
Example: A 0.300 kg mass rests on a 0.395 m long, 0.764 kg, uniform wooden plank supported by a string as shown in the figure. If the mass is 0.274 m from the wall and the angle between the string and the plank is 32.1°, (a) What is the force of tension in the string? and (b) What is the normal force from the wall? Want Lecture Notes? This is an AP Physics 1 Topic.

Content Times:
0:07 The problem

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Story of Saint John, Part 1 | English | Story of Saints
Watch the amazing story of Saint John today. John the Apostle-He was the son of Zebedee and Salome. His brother was James, who was another of the Twelve Apostles. (12:17)
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Modern Global Temperature
Earth's average global temperature changes over long periods of time. Past data records indicate that the global annual temperature of earth has increased throughout this century. (02:15)
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What Could Happen in a World That's 4 Degrees Warmer
Produced by WIRED Brand Lab for Western Digital. Comedian Aparna Nancherla explores how global warming and climate change will directly affect our lives 100 years from now when the average global temperature is projected to increase by 4 degrees Celsius, or 7.2 degrees Fahrenheit. Nancherla met with Professor of Atmospheric Science at UC Berkeley, Inez Fung, and Chief Data Officer at Western Digital, Janet George to to make predictions about how we’ll live in a 4C World. (14:28)

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Kids History: The First Thanksgiving | History
A group of children explain what happened on the first Thanksgiving. (03:07)
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The Electoral College
In this video clip, host David Eisenbach explains what the history and purpose of the Electoral College is and why it is so important to America's democratic process. (04:00)
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Jorinda And Jorindel - Fairy Tale & Bedtime Story
Jorinda and Jorindel is a fairy tale about a boy and girl who became enchanted by a bad fairy. (04:21)
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Understanding Ecosystems for Kids: Producers, Consumers, Decomposers
What is an ecosystem? An ecosystem is everything that interacts in a specific area. That includes plants, animals, sun, air, water, and even rocks! In a healthy ecosystem, every part gets what they need - food, water, shelter, light - and all of the parts work together. Unfortunately, an ecosystem can become unbalanced through natural or man-made disturbances. The good news? Ecosystems can recover if we just help them out a little!.(06:22)
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Food Chains Compilation: Crash Course Kids
Maybe you'd like to just hear about one topic for a while. We understand. So today, let's just watch some videos about how we get energy. And how one animal gets energy from another animal, or a plant. It's all about food chains and food webs in this Crash Course Kids Compilation. (15:56)

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What Would Happen If Humans Suddenly Disappeared?
It could be said that humans have really done a number on the planet. We’ve created a mess with our industrialization, the creation of toxic chemicals, garbage dumps and oceans filled with plastic, and giant urban sprawls that have eaten up big chunks of nature. With all this stuff happening, it might not be a bad idea if suddenly humans disappeared overnight. It’s obvious a lot of things would be happening during the cataclysmic disappearance. With that said, let’s run a mind-
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Does Your Vote Count? The Electoral College Explained
You vote, but then what? Discover how your individual vote contributes to the popular vote and your state's electoral vote in different ways--and see how votes are counted on both state and national levels. (05:21)

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The Secret to Motivating your Child
This talk was given at a local TEDx event, produced independently of the TED Conferences. Jennifer Nacif tells us how to shift manipulation to motivation when it comes to communicating with our children. Jennifer plays the characters of four different children, and in clever fashion, shows us how different personalities require different reactions from parents. The needs of each personality are not only relevant to the children in our lives, but to everyone we encounter, and Jennifer provides e
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What Happened Before History? Human Origins
Humans. We have been around for a while now. When we think about our past we think about ancient civilizations, the pyramids, stuff like that. But this is only a tiny, tiny part of our history. (10:05)

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A class of small RNA molecules called micro-RNAs (miRNAs) has been identified in recent years. The roles of these small RNAs are only just beginning to be understood, but many are expressed only at specific developmental stages. Indeed, the first observations of miRNAs were made in C. elegans because of their mutant developmental phenotypes. The genes that encode these miRNAs are called mir genes (pronounced â€˜meerâ€™) and have now been identified within the genomes of v
Author(s): The Open University

Study another free course

There are more than 800 courses on OpenLearn for you to choose from o
Author(s): The Open University

There is a distinction between somatic cells, those making up almost all of the body, and germline cells, which are the eggs and sperm and the cells that produce them. Somatic gene therapy is the transfer of genes into the somatic cells of the patient, such as cells of the bone marrow, and hence the new DNA does not enter the eggs or sperm. The genes transferred are usually normal alleles that could â€˜correctâ€™ the mutant or disease alleles of the recipient (see Study Note 2: The
Author(s): The Open University

5 Education for democracy?

We are surrounded by, and interact increasingly with, scientific and technological products â€“ for example, electronic miracles such as DVDs, mobile phones or microwave ovens; what is debatable is the extent to which we need to know anything of their workings to co-exist happily with them (see, for example, Chapman, 1991). Perhaps knowing something about the workings of mobile phones, for example, will help users assess the extent of any health risk they pose. Arguments for disseminating sci
Author(s): The Open University

1.3.1 The vertical 'structure' of the atmosphere

The atmosphere is not a simple, uniform slab of absorbing material. On the contrary, it gets progressively 'thinner' or less dense with increasing altitude (height above mean sea level); i.e. the total number of molecules in a given volume of air is lower, and so is the pressure. About 80% of the total mass of the atmosphere is within some 10 km of the surface; 99.9% lies below 50 km.

The important corollary is that the key greenhouse gas molecules (H2O and CO2
Author(s): The Open University

7 Conclusion

One might think of the different interpretations of internationally recognised notions of rights and justice as running along a spectrum, from which we shall now identify four different positions.

• The first interpretation would argue that, overall, the extension of rights to the international sphere has been benign and effective. It has led and will lead to further successful claims for justice.

Evidence for the development of a globa
Author(s): The Open University