@?public

Flashcards 2022-01-31 What are the four fundamental forces?? Strong nuclear force Weak nuclear force Electromagnetic force Gravitational force In what context does the strong nuclear force show up?? Holding nucleons together. When does the electromagnetic force act?? When two charged objects interact. In what context does the weak nuclear force show up?? Beta decay. When does the gravitational force show?? When any particles have mass. What is the relative strength of the strong nuclear force?

Flashcards 2022-01-26 What simplifying model do we use when talking about emitters and absorbers of electromagnetic radiation?? Black bodies. What two main assumptions are made about a black body?? They are perfect emitters and absorbers of electromagnetic radiation They emit radiation at all wavelengths Why is the sun yellow if it can be modelled as a near-perfect black body?? Because it is hotter than its surroundings and so is glowing. What is special about how a black body emits radiation at all wavelengths?

Flashcards 2022-01-25 What is this?? A Hertzsprung-Russell diagram. What is on the $x$-axis of a Hertzsprung-Russell diagram?? Temperature. Which out of luminosity and temperature goes in the wrong direction on a Hertzsprung-Russell diagram?? Temperature. What is on the $y$-axis of a Hertzsprung-Russell diagram?? Luminosity. What is sometimes confusing about the temperature values on a Hertzsprung-Russell diagram?? They measure “effective temperature”, not the temperature of the core. What are the units for luminosity measured on a Hertzsprung-Russell diagram?

Flashcards 2022-01-25 What is the cross product useful for?? Finding a normal vector to two other vectors. What is another name for the cross product?? The vector product. Does the cross product give you a scalar or a vector answer?? A vector. How can you work out the direction of the cross product of two vectors?? Using the right hand rule. In the right hand rule for working out the direction of the cross product, what is the first vector $a$ represented by?

Flashcards 2022-01-20 What did J. J. Thomson discover in 1897?? The electron. What model did J. J. Thomson propose for the atom?? The plum pudding model. What is the plum pudding model?? The idea that an atom contains negative electrons embedded in a uniform sea of positive charge. What is the one-sentence summary of the alpha-scattering experiment?? Fire alpha particles at a thin gold film and see where the alpha particles are deflected to using a microscope.

Or, This One FUNKY Trick For Taking Derivatives That TEACHERS Don’t Want You To Know The gradient of a straight line Taking the derivative dangerously Why isn’t this true? When are you allowed to take the derivative dangerously? Conclusion The gradient of a straight line Finding the gradient of a straight line is pretty easy. For example, consider the following straight line: $$ y = 3x + 1 $$ In this case, the gradient is three.

⚠️ This blog post is not finished and is a work in progress. ⚠️ General Thoughts Workflow Things that weren’t intuitive to learn The Good The Bad Cloud Support Sharing from a phone Sharing from a computer No inserting in PDFs Features that would be nice Exporting or indexing highlights in documents Conclusion The reMarkable 2 is an E-ink tablet that you can use for taking handwritten notes on as an alternative to paper.

Now 2022-02-17 Trying to cram some coursework in and go over some new topics for my A levels. Also messing around with SageMath to explore why the roots of the equation $9^{2x} = 27^{x^2 - 5}$ form a hyperbola on an Argand diagram and trying to find a series solution for $e^x \ln x = a$ that is a bit more applicable than the slowly converging and narrow $x = e^{\sum^\infty_{n = 1} \sum^\infty_{k = 0} \frac{(-1)^k k^{n-1} x^n}{k!

Flashcards 2022-01-19 What’s the reducible differential equations topic about?? Transforming complicated differential equations into simpler ones using a substitution. If $z = \frac{y}{x}$, or $y = xz$ what is $\frac{\text{d}y}{\text{d}x}$?? $$ \frac{\text{d}y}{\text{d}x} = z + x\frac{\text{d}z}{\text{d}x} $$ What’s the first stage in doing a first-order reducible differential equations question?? Working out how to substitute the derivative by differentiating. If a reducible differential equations question asks you to substitute $z = \frac{y}{x}$ then what is the first step?

Flashcards 2022-01-18 What are the four characteristics of a planet (ORFC)?? It is in __O__rbit around a star It has a mass large enough that gravity makes it __R__ound It has no __F__usion reactions It has __C__leared its orbit of most other objects What is the difference between a planet and a dwarf planet?? A dwarf planet has not cleared its neighbourhood. What is an asteroid?? An small, uneven and un-icy object that orbits the sun.

Flashcards 2022-01-18 What is the first stage in the evolution of a star?? A nebula. What is the main element in a nebula?? Hydrogen. What happens to a nebula after a long period of time?? It collapses under its own gravity. As a nebula is collapsing under its own gravity, what happens to the stores of energy?? The gravitational potential potential is transfered to kinetic energy. What happens as the gravitational energy of the dust particles in a nebula is transferred to kinetic energy?

Harry Potter is really a wizard. Pretty good, like [[Harry Potter and the Philosopher's Stone]]N. Thought it was better because there was a bit more of a plot rather than just something bit happening at the end. Backlinks [[Book Notes]]N Metadata date: 2022-01-17 19:28 finished: true rating: 7 tags: - '@?book' - '@?public' - '@?safe-to-post-online' title: Harry Potter and the Chamber of Secrets