Kinetic energy
... Energy - the ability to do work. Work – Force exerted over a distance If an object or organism does work, the object or organism uses energy. ...
... Energy - the ability to do work. Work – Force exerted over a distance If an object or organism does work, the object or organism uses energy. ...
Supernovae and cosmology
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
... Intensity differs among type Ia supernovae Change of luminosty depends on intensity Find the distance from intensity. Relatively precise measurement ...
Energy - Nathan Dawson
... 1.Draw a rough diagram. Label your arbitrary reference position for the potential energy (example, y = 0 for gravity). To avoid negative numbers, this is often taken to be at the lowest position you’ll be interested in.... Check to see that your system is isolated (no external forces doing work). 2. ...
... 1.Draw a rough diagram. Label your arbitrary reference position for the potential energy (example, y = 0 for gravity). To avoid negative numbers, this is often taken to be at the lowest position you’ll be interested in.... Check to see that your system is isolated (no external forces doing work). 2. ...
Astrophysics E1. This question is about stars.
... if less than critical density, universe expands without limit; ● if equal to critical density universe stops expanding after an infinite amount of time; ● if greater than critical density, universe expands first then contracts; [3] Award [1 max] if terms open, flat and closed are used and not define ...
... if less than critical density, universe expands without limit; ● if equal to critical density universe stops expanding after an infinite amount of time; ● if greater than critical density, universe expands first then contracts; [3] Award [1 max] if terms open, flat and closed are used and not define ...
Atoms, Einstein, Universe
... Part 3 builds on our knowledge of both the micro-world and the macro-world of stars to illuminate the mysteries of the universe. We begin with an exploration of our universe as it is today. How big are galaxies? How many galaxies are in the universe? How large is the universe? How small is its small ...
... Part 3 builds on our knowledge of both the micro-world and the macro-world of stars to illuminate the mysteries of the universe. We begin with an exploration of our universe as it is today. How big are galaxies? How many galaxies are in the universe? How large is the universe? How small is its small ...
Time From the Perspective of a Particle Physicist
... has inner nucleus, spiral arms (active star formation, halo of old stars (early shape) Cosmology. Hubble law Universe is expanding, gives universe’s age, depends on Hubble “constant” changes with time. Closed universe has gravity slowing the expansion so it starts to contract. Open universe expand ...
... has inner nucleus, spiral arms (active star formation, halo of old stars (early shape) Cosmology. Hubble law Universe is expanding, gives universe’s age, depends on Hubble “constant” changes with time. Closed universe has gravity slowing the expansion so it starts to contract. Open universe expand ...
Energy (Chap. 7) - Alejandro L. Garcia
... Why Energy Helps Motion, in general, is hard to calculate. Using forces, momentum, acceleration, etc. gets complicated because they are all vectors (have magnitude & direction). Energy is not a vector; it’s just a number. Can predict motion by figuring out how much energy that motion will “cost.” 2 ...
... Why Energy Helps Motion, in general, is hard to calculate. Using forces, momentum, acceleration, etc. gets complicated because they are all vectors (have magnitude & direction). Energy is not a vector; it’s just a number. Can predict motion by figuring out how much energy that motion will “cost.” 2 ...
A! Energy
... • If you stretch a rubber band and let it go, it sails across the room. • As it flies through the air, it has kinetic energy due to its motion. • Elastic potential energy is energy stored by something that can stretch or compress, such as a ...
... • If you stretch a rubber band and let it go, it sails across the room. • As it flies through the air, it has kinetic energy due to its motion. • Elastic potential energy is energy stored by something that can stretch or compress, such as a ...
Energy - Science
... object or travels from one medium to another. • SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed. • SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often also give off heat. • SC.3.P.11.2 - Investigate, observe, and explain that heat is p ...
... object or travels from one medium to another. • SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed. • SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often also give off heat. • SC.3.P.11.2 - Investigate, observe, and explain that heat is p ...
Document
... object or travels from one medium to another. • SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed. • SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often also give off heat. • SC.3.P.11.2 - Investigate, observe, and explain that heat is p ...
... object or travels from one medium to another. • SC.3.P.10.4 - Demonstrate that light can be reflected, refracted, and absorbed. • SC.3.P.11.1 - Investigate, observe, and explain that things that give off light often also give off heat. • SC.3.P.11.2 - Investigate, observe, and explain that heat is p ...
types of energy - s3.amazonaws.com
... Nature of Energy • What is energy that it can be involved in so many different activities? • Energy can be defined as the ability to do work. • If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy. ...
... Nature of Energy • What is energy that it can be involved in so many different activities? • Energy can be defined as the ability to do work. • If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy. ...
Why Study Cosmic Near Infrared Background? (1-4um)
... This is not a negative result, but is actually a good news for NIRB: we don’t really expect a lot of metal-free stars to be around at z~7-10. ...
... This is not a negative result, but is actually a good news for NIRB: we don’t really expect a lot of metal-free stars to be around at z~7-10. ...
Conservation of Energy
... mechanical energy of the apple doesn’t change as it falls. The potential energy that the apple loses is gained back as kinetic energy. The form of energy changes, but the total amount of energy remains the same. ...
... mechanical energy of the apple doesn’t change as it falls. The potential energy that the apple loses is gained back as kinetic energy. The form of energy changes, but the total amount of energy remains the same. ...
The Hubble Mission - Indiana University Astronomy
... of the universe began to speed up four to six billion years ago, when the Dark Energy's repulsive force began to overcome the attractive force of gravity over cosmic distances Supernovae measured with Hubble hint that Dark Energy's repulsive force is constant over cosmic time and so could be consist ...
... of the universe began to speed up four to six billion years ago, when the Dark Energy's repulsive force began to overcome the attractive force of gravity over cosmic distances Supernovae measured with Hubble hint that Dark Energy's repulsive force is constant over cosmic time and so could be consist ...
The Universe Section 1
... The Life Cycle of Stars, continued • The sun will become a red giant before it dies. – As fusion slows, the outer layers of the sun will expand. – The sun will become a red giant. • red giant: a large, reddish star late in its life cycle – When the sun runs out of helium, the outer layers will expan ...
... The Life Cycle of Stars, continued • The sun will become a red giant before it dies. – As fusion slows, the outer layers of the sun will expand. – The sun will become a red giant. • red giant: a large, reddish star late in its life cycle – When the sun runs out of helium, the outer layers will expan ...
Kinetic energy - Sackville School
... This means that energy never just ‘disappears’. The total amount of energy always stays the same, i.e. total input energy = total output energy. In most energy transfers, the energy is transferred to several different forms, which may or may not be useful. 22 of 30 ...
... This means that energy never just ‘disappears’. The total amount of energy always stays the same, i.e. total input energy = total output energy. In most energy transfers, the energy is transferred to several different forms, which may or may not be useful. 22 of 30 ...
Energy-Transformations-Practice-Quiz
... A. weight and speed of the object B. shape of the object and its position relative to the ground C. weight of the object and height above the ground D. shape and speed of the object 17. A flashlight changes __________________ energy to ____________________ energy. A. radiant energy to chemical energ ...
... A. weight and speed of the object B. shape of the object and its position relative to the ground C. weight of the object and height above the ground D. shape and speed of the object 17. A flashlight changes __________________ energy to ____________________ energy. A. radiant energy to chemical energ ...
talk.wyse - Johns Hopkins University
... In ΛCDM the first scales to form are small, and galaxies like the Milky Way evolve through merging and assimilation of smaller systems. Highest resolution N-body simulations (gravity only) show persistent small-scale substructure, with many more darkmatter subhaloes surviving to the present-day than ...
... In ΛCDM the first scales to form are small, and galaxies like the Milky Way evolve through merging and assimilation of smaller systems. Highest resolution N-body simulations (gravity only) show persistent small-scale substructure, with many more darkmatter subhaloes surviving to the present-day than ...
Dark energy
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.