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- Is Power Conserved in Energy Systems? - Physics Forums
As @DrClaude said, power is not conserved, only energy But it is easy to bet confused by the bookkeeping The way to write this is Energystoreddt=Powerin−Powerout If the change in energy stored is zero, then Power In = Power Out If someone is sloppy and forgets to mention stored energy, then it appears that power must be conserved
- How momentum is conserved in an inelastic collision - Physics Forums
These interactions that lose energy to the surroundings will keep energy from being conserved in the system They also violate the concept of “no external forces” and can keep momentum from being conserved When we say momentum and energy are conserved we are claiming we have made all of the external interactions negligibly small
- Conserved quantities under the Lorentz boost - Physics Forums
The following combination of observables is conserved: ##HR - Pc^2t## where ##H## is the energy, ##R## is the center-of-mass position, and ##P## is the momentum In other words, this means that the center of mass of any system moves with constant velocity along a straight line
- Energy is not conserved vs. energy is conserved: Friedmann Equations
The difference between the conserved ADM energy and Bondi energy is the energy of radiation (including gravitational) reaching infinity Thus, the Bondi energy decreases for an isolated pair of co-orbiting bodies embedded in asymptotically flat spacetime, for example
- Conservation of Momentum: Falling object - Physics Forums
Its the total momentum of a closed system that is conserved Not the momentum of a particle In your case the particle has a force acting on it and as such the momentum changes There is no law of physics which states that the momentum of a particle is conserved The gravitational force changs the momentum of a ball in free-fall
- Is angular momentum always conserved? - Physics Forums
Yes, angular momentum is always conserved You have not shown how the velocities and rotation rates resulting from the collision were derived With three conserved quantities (linear momentum, angular momentum and energy) you should be able to solve for three results (ball velocity, rod velocity and rod rotation) in such a way as to conserve
- Meaning of the word conserved in relativity - Physics Forums
The mass of an isolated system is conserved as a trivial consequence of energy-conservation (i e , energy is conserved for any frame, including the system's rest frame) If one goes with #3, then one must admit that there's a sense in which velocity is conserved, too (finally connecting things back to your post here, @PeroK) And if that sounds
- Galilean invariance and conserved quantities - Physics Forums
A simpe geometric argument shows that this leads to the following conserved quantity for a Lorentz transformation in the xt plane: -xE + tP x *, and similarly for yt and zt planes This can be thought of as a 'spacetime angular momentum'
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