Consciousness and the Pineal Gland The pineal gland has always held an elevated status in the records of most ancient cultures. Each family of glands in the endocrine system secrete hormones that stimulate certain aspects of bodily function: The pineal gland secretes hormones that modulate the state of consciousness. Melatonin functions on a daily basis, METAtonin is rarely, if ever, produced.
Gray Vector Diagrams We use vector diagrams to visualize what is going on in a physical system. Even though we Scalar and vectors essay work out most problems algebraically, a picture can help point out subtleties of a problem.
The first step when solving any problem in physics is to draw a picture. The following diagram illustrates two points. The first is the concept of the tip and the tail of a vector.
With vectors, direction is very important so we put an arrowhead in the direction that the vector is going.
This is sometimes called the tip of a vector. The other end is usually called the tail. The second concept that the diagram shows is that two vectors with the same magnitude and direction are the same. This allows us to move vectors around the coordinate system to help simplify the math involved with them.
Expressing Vectors Using Components Vectors can be expressed in terms of their magnitude and direction or in terms of their components. Being able to translate between the two representations is an essential skill in physics. The magnitude of a vector is its length. The direction is usually given in terms of some angle.
When dealing with vectors it is usually much more convenient to break them up into component vectors. Component vectors are vectors which run parallel to the coordinate axes. For instance, a two-dimensional vector has two component vectors, one in the X direction, and one in the Y direction.
The diagram below shows a two dimensional vector and its components.
Vector Addition The following diagram illustrates a vector sum. Notice that we may move the tail of the second vector to the tip of the first vector to get the resultant vector. It does not matter which vector is moved, as long as the are tip-to-tail with each other.
Once the vectors are expressed as their independent components, it is possible to add them.
Since each component is a scalar they may added normally to the same component of the other vector. Conceptually, it looks like the following diagram.
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|Sample essay on scalars and vectors quantities||Bell wrote that David "Bohm's papers on quantum mechanics were for me a revelation. The elimination of indeterminism was very striking.|
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Multiplication of a Vector by a Scalar A vector may be multiplied by a scalar by multiplying each of its components by that number. Notice that the vector does not change direction, only length. This is shown pictorially below. A special case of vector multiplication is when we multiply a vector by This causes the vector to reverse direction.
We will use this property to perform vector subtraction. Vector Subtraction The vector difference works the same as vector addition except that we multiply the vector we are subtracting by It is much like subtracting two numbers: The diagram below illustrates vector subtraction in the tip-to-tail style.
The original B vector is shown as a dotted line.Addition Of Vectors Essay - I. Introduction A vector is an arrow whose length represents the magnitude of a quantity and whose direction represents the direction of the quantity.
Vectors are useful in combining velocities that are not parallel. The Free High School Science Texts: A Textbook for High School Students Studying Physics. FHSST Authors1 December 9, 1See grupobittia.com A scalar is a quantity which can be described by a single number, unlike vectors, tensors, etc.
which are described by several numbers which describe magnitude and direction. A related concept is a pseudoscalar, which is invariant under proper rotations but (like a .
The Cosmos with the Success/failure System. Authors: Dong-Yih Bau Comments: 7 Pages. The ancient Greeks saw the universe as a well-ordered system called the cosmos.
Current scientific research seeks the cosmos in terms of a final theory, which remains in progress.
Vector analysis, a branch of mathematics that deals with quantities that have both magnitude and direction. Some physical and geometric quantities, called scalars, can be fully defined by specifying their magnitude in suitable units of measure.
A scalar is a quantity which can be described by a single number, unlike vectors, tensors, etc. which are described by several numbers which describe magnitude and direction. A related concept is a pseudoscalar, which is invariant under proper rotations but (Ilke d pseudovector) flips sign under Improper rotations.