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WIMPs and MACHOs - Caltech Astronomy
... this mysterious material must not emit or absorb appreciable electromagnetic radiation in any known waveband. Thus it is called dark matter. The nature of this material is one of the biggest unsolved problems in science. It is important to identify the dark matter, but since it is easy to invent sub ...
... this mysterious material must not emit or absorb appreciable electromagnetic radiation in any known waveband. Thus it is called dark matter. The nature of this material is one of the biggest unsolved problems in science. It is important to identify the dark matter, but since it is easy to invent sub ...
!!!Energy!!!
... Work is also measured in joules ( j ) When work is done on an object, energy is transferred to that object ...
... Work is also measured in joules ( j ) When work is done on an object, energy is transferred to that object ...
Kinetic and Potential Energy
... A continuous conversion between kinetic energy and potential energy takes place in a pendulum. •At the highest point in its swing, the pendulum in the figure has only gravitational potential energy. •As the pendulum starts to swing downward, it speeds up and its gravitational potential energy change ...
... A continuous conversion between kinetic energy and potential energy takes place in a pendulum. •At the highest point in its swing, the pendulum in the figure has only gravitational potential energy. •As the pendulum starts to swing downward, it speeds up and its gravitational potential energy change ...
Potential Energy
... • Light Energy is produced by the vibrations of electrically charged particles. • Nuclear Energy is energy that comes from changes in the nucleus of an atom. ...
... • Light Energy is produced by the vibrations of electrically charged particles. • Nuclear Energy is energy that comes from changes in the nucleus of an atom. ...
Work
... energy is turned into? • The kinetic energy turns into heat energy. • In the presence of kinetic friction, nonmechanical energy is no longer negligible and mechanical energy is no longer conserved. • This does not mean that energy in general is not conserved– TOTAL energy is always conserved. • The ...
... energy is turned into? • The kinetic energy turns into heat energy. • In the presence of kinetic friction, nonmechanical energy is no longer negligible and mechanical energy is no longer conserved. • This does not mean that energy in general is not conserved– TOTAL energy is always conserved. • The ...
File
... This is a nice, tidy little statement but what does it mean? In this form it does little to tell us what energy IS. It also fails to mention what FORMS the energy may take, not to mention that the term work does not show up in the theorem in this form. But that is only one of many statements of the ...
... This is a nice, tidy little statement but what does it mean? In this form it does little to tell us what energy IS. It also fails to mention what FORMS the energy may take, not to mention that the term work does not show up in the theorem in this form. But that is only one of many statements of the ...
Lecture - Ann Arbor Earth Science
... universe to be somewhere around 13.7 to 14 billion years old. Scientists estimate that there are 350 billion galaxies in the observable universe. Galaxies tend to collect into superclusters surrounded by large voids. 10 million of these superclusters may exist. ...
... universe to be somewhere around 13.7 to 14 billion years old. Scientists estimate that there are 350 billion galaxies in the observable universe. Galaxies tend to collect into superclusters surrounded by large voids. 10 million of these superclusters may exist. ...
WIMPs and MACHOs - Caltech Astronomy
... this mysterious material must not emit or absorb appreciable electromagnetic radiation in any known waveband. Thus it is called dark matter. The nature of this material is one of the biggest unsolved problems in science. It is important to identify the dark matter, but since it is easy to invent sub ...
... this mysterious material must not emit or absorb appreciable electromagnetic radiation in any known waveband. Thus it is called dark matter. The nature of this material is one of the biggest unsolved problems in science. It is important to identify the dark matter, but since it is easy to invent sub ...
Mechanical energy transformations
... Think of an apple hanging from a treeThe apple earth system has gravitational potential energy. It does not have kinetic energy while the apple is hanging from the tree because the apple is not moving. When the apple falls the gravitational potential energy decreases, so it is transformed into kinet ...
... Think of an apple hanging from a treeThe apple earth system has gravitational potential energy. It does not have kinetic energy while the apple is hanging from the tree because the apple is not moving. When the apple falls the gravitational potential energy decreases, so it is transformed into kinet ...
relativistic time correction on movement of distant galaxies
... But we have just received light from that galaxy and hence cannot see the past life of star). But 18.4 billion years is greater than the present estimated age of the universe. It means that star was formed even before big bang! This is happening because; we are not applying relativistic time correct ...
... But we have just received light from that galaxy and hence cannot see the past life of star). But 18.4 billion years is greater than the present estimated age of the universe. It means that star was formed even before big bang! This is happening because; we are not applying relativistic time correct ...
Potential Energy - Doral Academy Preparatory
... 〉What is nonmechanical energy? 〉Energy that lies at the level of the atom is sometimes called nonmechanical energy. • mechanical energy: the amount of work an object can do because of the object’s kinetic and potential energies • In most cases, nonmechanical forms of energy are just special forms of ...
... 〉What is nonmechanical energy? 〉Energy that lies at the level of the atom is sometimes called nonmechanical energy. • mechanical energy: the amount of work an object can do because of the object’s kinetic and potential energies • In most cases, nonmechanical forms of energy are just special forms of ...
Potential Energy
... 〉What is nonmechanical energy? 〉Energy that lies at the level of the atom is sometimes called nonmechanical energy. • mechanical energy: the amount of work an object can do because of the object’s kinetic and potential energies • In most cases, nonmechanical forms of energy are just special forms of ...
... 〉What is nonmechanical energy? 〉Energy that lies at the level of the atom is sometimes called nonmechanical energy. • mechanical energy: the amount of work an object can do because of the object’s kinetic and potential energies • In most cases, nonmechanical forms of energy are just special forms of ...
Kinetic Energy
... the diving board. This requires an input of kinetic energy. These changes in energy are examples of energy conversion, the process in which energy changes from one type or form to another. ...
... the diving board. This requires an input of kinetic energy. These changes in energy are examples of energy conversion, the process in which energy changes from one type or form to another. ...
Powerpoint
... in radius. During this time Rphoto ~ 1015 – 1016 cm. The internal energy deposited by the shock is converted almost entirely to expansion kinetic energy. R has expanded by 100 or more (depending on the initial radius of the star) and the envelope has cooled dramatically. ...
... in radius. During this time Rphoto ~ 1015 – 1016 cm. The internal energy deposited by the shock is converted almost entirely to expansion kinetic energy. R has expanded by 100 or more (depending on the initial radius of the star) and the envelope has cooled dramatically. ...
Cosmology Handouts
... Rainbows reveal that white light is a combination of all the colours. In 1666, Isaac Newton showed that white light could be separated into its component colours using glass prisms. Soon scientists were using this new tool to analyze the light coming from several different light sources. Some scient ...
... Rainbows reveal that white light is a combination of all the colours. In 1666, Isaac Newton showed that white light could be separated into its component colours using glass prisms. Soon scientists were using this new tool to analyze the light coming from several different light sources. Some scient ...
Energy and Matter - Colina Middle School
... _______________________ Energy – energy that holds the particles in an atomic nucleus together ________________________ Energy – energy stored in an object raised off of the surface of the Earth. The____________it is lifted the ____________ the amount of stored energy in the object. __________ ...
... _______________________ Energy – energy that holds the particles in an atomic nucleus together ________________________ Energy – energy stored in an object raised off of the surface of the Earth. The____________it is lifted the ____________ the amount of stored energy in the object. __________ ...
PowerPoint
... • The analogies are just to help us visualize, don’t get stuck in the specifics. • The Universe has no center • The Universe has no edge • Concept of time and space began with the Universe, can not apply the concepts so easily. • The Doppler Effect is not the real reason that galaxies are redshifted ...
... • The analogies are just to help us visualize, don’t get stuck in the specifics. • The Universe has no center • The Universe has no edge • Concept of time and space began with the Universe, can not apply the concepts so easily. • The Doppler Effect is not the real reason that galaxies are redshifted ...
Dark energy
![](https://commons.wikimedia.org/wiki/Special:FilePath/Dark_Energy.jpg?width=300)
In physical cosmology and astronomy, dark energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe. Dark energy is the most accepted hypothesis to explain the observations since the 1990s indicating that the universe is expanding at an accelerating rate. Assuming that the standard model of cosmology is correct, the best current measurements indicate that dark energy contributes 68.3% of the total energy in the present-day observable universe. The mass–energy of dark matter and ordinary matter contribute 26.8% and 4.9%, respectively, and other components such as neutrinos and photons contribute a very small amount. Again on a mass–energy equivalence basis, the density of dark energy (6.91 × 10−27 kg/m3) is very low, much less than the density of ordinary matter or dark matter within galaxies. However, it comes to dominate the mass–energy of the universe because it is uniform across space.Two proposed forms for dark energy are the cosmological constant, a constant energy density filling space homogeneously, and scalar fields such as quintessence or moduli, dynamic quantities whose energy density can vary in time and space. Contributions from scalar fields that are constant in space are usually also included in the cosmological constant. The cosmological constant can be formulated to be equivalent to vacuum energy. Scalar fields that do change in space can be difficult to distinguish from a cosmological constant because the change may be extremely slow.High-precision measurements of the expansion of the universe are required to understand how the expansion rate changes over time and space. In general relativity, the evolution of the expansion rate is parameterized by the cosmological equation of state (the relationship between temperature, pressure, and combined matter, energy, and vacuum energy density for any region of space). Measuring the equation of state for dark energy is one of the biggest efforts in observational cosmology today.Adding the cosmological constant to cosmology's standard FLRW metric leads to the Lambda-CDM model, which has been referred to as the ""standard model of cosmology"" because of its precise agreement with observations. Dark energy has been used as a crucial ingredient in a recent attempt to formulate a cyclic model for the universe.