Pythagorean vs. Equally Tempered Tuning is a paper discussing the differences, pros, and cons of the two systems of tuning musical instruments. Complete with 6 source bibliography.

Pythagorean vs. Equally Tempered Tuning is a paper discussing the differences, pros, and cons of the two systems of tuning musical instruments. Complete with 6 source bibliography. Pythagorean vs. Equally TemperedIn the western world of music, there is a commonly used system of tuning for an instrument, called equally tempered tuning. However, this was not always the system in use. Before equal tempered tuning, there was the Pythagoras scale, developed about 2,500 years ago by Pythagoras. Although Pythagoras' scale sounded very natural, it had a flaw. Over time, more complex instruments were created that could reach higher octaves, where the flaw became too obvious to ignore. While equal tempered tuning fixed the error, some qualities were also lost. To understand both of these systems and their differences, we must first have a basic understanding of sound.Sound is energy. When something creates sound vibrations, it makes molecules in the air vibrate (longitudinal waves), which then travel to the ear and vibrate the ear. These vibrations are then interpreted by the brain as sound. Different sounds have different shapes, velocities and pitches.English: Visual r epresentation of File:Pythagorean...The velocity of sound refers to the strength with which the sound is created. Pitch refers to the frequency or rate of vibration. If something is high pitched, it has a high frequency, meaning it vibrates the air at a higher rate, and a low pitch vibrates at a lower rate. Different sound interpreters have different frequency ranges. For example, humans can hear sounds ranging from 20Hz to 20kHz. However, dogs can hear sounds at 50 kHz or higher. This is why dog whistles cannot be heard by humans, but can by dogs; because their frequency is above our hearing range, but still within that of dogs.Discovered around 530 BCE, Pythagoras' Scale was a very natural sounding scale. It was first discovered, when Pythagoras realized that when you pluck two strings of a certain ratio to each other, it makes a...

Cocaine Facts and Description

Cocaine Facts and Description Cocaine is benzoylmethylecgonine, a crystalline alkaloid from the coca plant. It acts as a stimulant, appetite suppressant, and anesthetic. Crack cocaine is another form of cocaine, a derivative of cocaine hydrochloride. Here are some useful cocaine facts and answers to common questions: What Does Cocaine Look Like? Powdered cocaine is a fine white powder. Street cocaine is cut with other substances to increase profit, so its appearance may be slightly different, depending on the type of impurity. How Is Powdered Cocaine Used? Powdered cocaine is most commonly snorted through the nose, though it may be dissolved in water and injected. Snorted cocaine produces a high within 3-5 minutes after use. Injected cocaine produces an effect within 15-30 seconds. Crack cocaine usually is smoked. Why Do People Use Cocaine? Cocaine is used because it produces euphoria, is a stimulant, suppresses appetite, and can be used as a pain reliever. It is highly addictive and leads to tolerance sometimes after one use, so increasing doses of cocaine are needed to achieve a high. What Are the Effects of Cocaine Use? Users typically feel a rush followed by a sense of alertness and well-being. Cocaine increases levels of the neurotransmitter dopamine, which is associated with pleasure and increased movement. When the pleasant effects of cocaine wear off users may feel down or depressed, more than before taking the drug. Some users report being unable to duplicate the intensity of the first exposure with subsequent use. The stimulant effects of cocaine can lead users to feel anxious, restless, and irritable. What Are the Risks of Using Cocaine? Cocaine is highly addictive. Cocaine users are at risk for dangerously elevated blood pressure, heart rate, and temperature, risk of seizure, stroke, and cardiac arrest. Injecting cocaine can involve a risk of contracting HIV, hepatitis, and other blood-borne diseases. Where Does Cocaine Come From? Cocaine is derived from a paste from the coca plant, a species which grows in South America. Street Names for Cocaine BlowCNose CandyPowderNose PowderWhite PowderAspirinAuntBirdie PowderBolivian Marching PowderBouncing PowderCandy SugarDevils DandruffFast White LadyFlakeFlaveFoolish PowderFriskie PowderJoy PowderMarching PowderParibaPowder DiamondsShakeShrileSnowballSoftStar-Spangled PowderSugar BoogersUptownWhite BoyWhite DragonYao