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Creation: Stars and Planets
Creation: Stars and Planets

CHAPTER 1 Introduction /Basic concept
CHAPTER 1 Introduction /Basic concept

the smallest particle in nature and the
the smallest particle in nature and the

Understanding Mechanical Advantage in the Single Sheave Pulley
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... 39. A physics teacher rubs a glass object and a felt cloth together and the glass becomes positively charged. Which of the following statements are true? Circle all that apply. a. The glass gained protons during the rubbing process. b. The felt became charged negatively during this rubbing process. ...
ON THE ELECTRODYNAMICS OF MOVING BODIES By A. Einstein June 30, 1905
ON THE ELECTRODYNAMICS OF MOVING BODIES By A. Einstein June 30, 1905

Momentum and Its Conservation
Momentum and Its Conservation

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... depends in some way on the motion of the rest; and at the same time these connexions must be capable of a certain kind of elastic yielding, since the communication of motion is not instantaneous, but occupies time. The medium is therefore capable of receiving and storing up two kinds of energy, name ...
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Physics and Our Universe: How It All Works
Physics and Our Universe: How It All Works

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Entanglement and the black hole information paradox

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... Gravity is the force of attraction between objects that is due to their masses. Gravity can effect the position of an object or the direction of an object. Property of NASA Chapter 4 Section 4 ...
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Lecture Chapter 15

... important to note that the charge on the rod remains constant (negative). The charge on the sphere is now positive as it lost electrons to Earth. Compared to the amount of free electrons already in Earth, the earth has gained an insignificant amount of charge and therefore the charge on the earth st ...
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Dynamics: Newton`s Laws of Motion - Pearson-Global

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Simple Machines Lever Wheel and Axel Pulley

... A condition where there are no net external forces acting upon a particle or rigid body. As a result the body remains at rest or continues at a constant velocity. Note: “no net external forces” doesn’t mean “no forces”… it just means if forces exist they are cancelling each other out. So, the “net r ...
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< 1 ... 9 10 11 12 13 14 15 16 17 ... 396 >

Gravity

Gravity or gravitation is a natural phenomenon by which all things with mass are brought towards (or 'gravitate' towards) one another including stars, planets, galaxies and even light and sub-atomic particles. Gravity is responsible for the complexity in the universe, by creating spheres of hydrogen, igniting them under pressure to form stars and grouping them into galaxies. Without gravity, the universe would be an uncomplicated one, existing without thermal energy and composed only of equally spaced particles. On Earth, gravity gives weight to physical objects and causes the tides. Gravity has an infinite range, and it cannot be absorbed, transformed, or shielded against.Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity, not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass/energy; and resulting in time dilation, where time lapses more slowly in strong gravitation. However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which postulates that gravity is a force where two bodies of mass are directly drawn (or 'attracted') to each other according to a mathematical relationship, where the attractive force is proportional to the product of their masses and inversely proportional to the square of the distance between them. This is considered to occur over an infinite range, such that all bodies (with mass) in the universe are drawn to each other no matter how far they are apart.Gravity is the weakest of the four fundamental interactions of nature. The gravitational attraction is approximately 10−38 times the strength of the strong force (i.e. gravity is 38 orders of magnitude weaker), 10−36 times the strength of the electromagnetic force, and 10−29 times the strength of the weak force. As a consequence, gravity has a negligible influence on the behavior of sub-atomic particles, and plays no role in determining the internal properties of everyday matter (but see quantum gravity). On the other hand, gravity is the dominant force at the macroscopic scale, that is the cause of the formation, shape, and trajectory (orbit) of astronomical bodies, including those of asteroids, comets, planets, stars, and galaxies. It is responsible for causing the Earth and the other planets to orbit the Sun; for causing the Moon to orbit the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; for solar system, galaxy, stellar formation and evolution; and for various other phenomena observed on Earth and throughout the universe.In pursuit of a theory of everything, the merging of general relativity and quantum mechanics (or quantum field theory) into a more general theory of quantum gravity has become an area of research.
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