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Physics

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Projectile Motion

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What follows is a general solution for the two dimensional motion of an object thrown in a gravitational field. This is usually termed a projectile motion problem. The thrown object is called the projectile. Its path is called the trajectory. We will answer all the usual questions that arise in a first year physics class regarding this motion. We will not consider air resistance. Without air resistance, the projectile will follow a parabolic trajectory. We will be throwing the projectile on level ground on planet Earth. It will leave the point of release, arc through the air along a path shaped like a parabola, and then hit ground a certain distance from where it was thrown.

AP Physics algebra/trig: Waves

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Wave Motion A wave is the motion of a disturbance. A medium is a physical environment through which a disturbance can travel. For example, water is the medium for ripple waves in a pond. Waves that require a medium through which to travel are called mechanical waves. Water waves and sound waves are mechanical waves. Electromagnetic waves such as visible light do not require a medium. *Note: Waves are energy moving through the medium. Wave Types A wave that consists of a single traveling pulse is called a pulse wave. Whenever the source of a wave?s motion is a periodic motion, such as the motion of your hand moving up and down repeatedly, a periodic wave is produced.

Equlibrants

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Equilibrants Example 1: There is a river with a current that has a velocity of 3 m/s in a direction of east. A man is trying to get straight across the river. His boat has a velocity of 4 m/s. What angle does he need to face the boat to move directly across the river? Explanation: We have 3 vectors in this problem: 1. The boat going straight across from point A to point B, which is the resultant. 2. The boat?s vector in calm water, which is the vector pointed at North West and has a magnitude 4 m/s. 3. The river?s current, which is 3 m/s going east. An object often looks like they are directed toward an angle, but they are actually going straight

Laws of Thermodynamics

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The Zeroth Law There are four laws of thermodynamics which build upon each other. They are numbered 0 through 3 because the most fundamental law was discovered after the First Law had already been given the number 1. Therefore, they had to assign the most fundamental law the number 0. The Zeroth Law simply says there is no heat flow between objects that are the same temperature. In essence, the Zeroth Law is just a definition of what temperature is.

Newton Second Law

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Newton was the first to mathematically express the relationship between force and momentum. Some physicists interpret Newton's second law of motion as a definition of force and mass, while others consider it to be a fundamental postulate, a law of nature. Either interpretation has the same mathematical consequences, historically known as "Newton's Second Law": The quantity mv is called the (canonical) momentum. The net force on a particle is thus equal to rate change of momentum of the particle with time. Since the definition of acceleration is a = dv/dt, the second law can be written in the simplified and more familiar form:

Alzheimer's Disease

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Alzheimer’s Disease International Alois Alzheimer on ibro.org Alois Alzheimer was born in 1864 in Markbreit in Bavaria, Southern Germany. Excelling in sciences at school he studied medicine in Berlin, Aschaffenburg Tubingen and Wurzburg where he graduated with a medical degree in 1887. He began work in the state asylum in Frankfurt am Main, becoming interested in research on the cortex of the human brain. Here he commenced his education in psychiatry and neuropathology.

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