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Summary In summary, what is the roots of polynomials topic about?? Exploring the underlying relationship between the roots of a polynomial and the coefficient of each term. Basic Notations What are the two roots of a quadratic called?? $$ \alpha, \beta $$ What are the three roots of a cubic called?? $$ \alpha, \beta, \gamma $$ What are the four roots of a quartic called?? $$ \alpha, \beta, \gamma, \delta $$ Definitions What is the sum of the roots $\alpha + \beta$ equal to for a quadratic?

What are the two conditions for equilibrium?? Net force is zero Net moment is zero What is the name for two forces in an arrangement like the following?? PHOTO Is the following a couple PHOTO?? Yes. Is the following an equilibrium PHOTO?? No. Describe the motion as a result of PHOTO?? The object will spin with increasing angular velocity. When do couples produce a turning effect?? When there is a perpindicular distance between them.

What is a summary of encryption?? A way of making sure data cannot be understood if you don’t possess the means to decrypt it. What is a Ceasar cipher?? A method of encryption where you shift the letters along by a consistent amount. What is a brute-force attack?? Where you attempt every possible key to decrypt ciphertext until one works. What is another name for a one-time pad?? A Vernam cipher What is another name for a Vernam cipher?

Why is compression needed?? Because data is constantly being moved around computer systems and networks so a smaller amount of data can be beneficial. What are the two types of comression?? Lossy Lossless What’s an example of a lossy image compression format?? JPG What’s an example of a lossy music compression format?? MP3 What is the definition of run length encoding?? A basic method of compression that summarises consecutive patterns of the same default.

What does MIDI stand for?? Musical Instrument Digital Interface What is the difference between a live recording and MIDI?? Midi is recording a synthesised sound. What is the advantage of MIDI?? Full sound signal doesn’t need to be transmitted, only instructions to play the sound. If vector graphics are the instructions to draw an image, MIDI is?? The instructions to make a sound. Backlinks [[Computing - Syllabus]]S Metadata date: 2020-10-15 11:30 tags: - '@?

What is the main difference between an analogue and digital signal?? Analogue signals are continuous while digital signals are discrete. In one sentence, how does a digital-to-analogue converter for sound work?? Sound is captured by a microphone which is sampled at regular intervals and these samples are converted to binary. The frequency at which samples of a sound are taken is called?? The sampling rate. When an analogue sound signal is being converted to digital, what value is sampled?

How many radians in a full circle?? $$ 2\pi $$ How many radians in $360^{\circ}$?? $$ 2\pi $$ How many circles in a half turn?? $$ \pi $$ What is $180^{\circ}$ in radians?? $$ \pi $$ What is $\frac{\pi}{2}$ radians in degrees?? $$ 90^{\circ} $$ What is $90^{\circ}$ degrees in radians?? $$ \frac{\pi}{2} $$ What is $\frac{\pi}{3}$ radians in degrees?? $$ 60^{\circ} $$ What is $60^{\circ}$ degrees in radians?? $$ \frac{\pi}{2} $$ What is $\frac{\pi}{6} radians in radians?

Completing the Square (blank so that the linker doesn’t complain). Backlinks [[Maths - Syllabus]]S Metadata date: 2020-10-14 10:45 tags: - '@?maths' - '@?school' - '@?public' - '@?year-1' title: Maths - Completing the Square

What is the _word- equation for weight?? $$ \text{weight} = \text{mass} \times \text{gravitational field strength} $$ What is the symbol equation for weight?? $$ W = mg $$ The equation $W=mg$ is a special case of which more general formula?? $$ F = ma $$ What are the two different units for $g$, the acceleration due to gravity?? $$ \frac{N}{kg} \\ ms^{-2} $$ Which SUVAT equation would be the most useful for calculating $g$?? $$ s = ut + \frac{1}{2}at^2 $$

In one sentence, how does a camera work?? Approximating a real image by cutting it up into a grid using a light sensor. How is the grid of colour converted into binary in a camera?? Using an analogue-to-digital converter. What is a bitmap?? A grid of pixels. What’s another word for raster graphics?? Bitmap graphics. What is a common bitmap file type?? BMP JPG GIF PNG TIF What is special about a BMP file?

What is a moment?? The turning effect produced by a force around a pivot point. What is the word formula for moments?? $$ \text{moment} = \text{force} \times \text{perpindicular distance} $$ What is the symbol formula for moments?? $$ M = Fd $$ The formula $M = Fd$ is the formula for…?? Moments. What is the principle of moments?? When a body is balanced, the total clockwise moment about a point equals the total anticlockwise moment.

In summary, what are the three things a processor does?? Controls instructions Calculates instructions Executes instructions What is the ALU?? The Arithmetic-Logic Unit What is the CU?? The Control Unit How could you describe the ALU?? The problem solving part of the processor. What’s an example of the arithmetic operations?? Add Subtract Multiply Divide What’s an example of logical operations?? AND OR NOT XOR What’s an example of a shift operation?