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Physics : Recent Questions and Answers (Page 664)

Find answers to your questions about Physics or help others by answering their Physics questions.

Can particles gain energy during inelastic collision?

We know that when two particles collides inelastically, the net energy equation is given by$$E_i=E_f+Q$$ where $E_i$ and $E_f$ are initial and final mechanical energies of...

Asked on 01/10/2021

2 answer

Time-dalay oscilloscope

I was trying to find the time delay for the propagated wave shown below, noted that for all frequency the source voltage has the same value. The data was obtained...

Asked on 01/09/2021 by Maxwell

0 answer

If friction serves as the centripetal force then can it be greater than the centripetal force itself?

I know the title looks vague and the concept also looked strange to me when I read this. In the...

Asked on 01/09/2021

5 answer

Symmetric energy-momentum tensor

In field theory, there's no guarantee that the energy-momentum tensor resulting from Noether's theorem is symmetric. The usual trick to construct a symmetric tensor is to add to the original...

Asked on 01/09/2021

0 answer

Does localized energy operator make sense in quantum field theory?

In quantum field theory in weak gravity regime, it is possible to trace out some region to obtain reduced density matrix of states restricted to hypersurface $V$. I believe...

Asked on 01/09/2021 by Chris Lew

0 answer

Is there a way to convert directly most electromagnetic radiation to kinetic energy?

Parent questions:Do photons lose energy after radiation pressure is applied to a perfect reflector? Since radiation loses energy to radiation pressure in a reflection, can the entire...

Asked on 01/09/2021

3 answer

Are electrons just incompletely evaporated black holes?

Imagine a black hole that is fast-approaching its final exponential throws of Hawking evaporation. Presumably, at all points in this end processthere will remain a region that identifiably remains...

Asked on 01/09/2021 by Terry Bollinger

3 answer

How do I manipulate constraints in constraint derivatives of Legendre transformations?

I having trouble understanding the constraint derivative in the highlighted part of the picture below, which allows to convert the one adimensional thermodynamical relation into its dimensional counterpart.Specifically ,when...

Asked on 01/09/2021

1 answer

Colors of the Earth from space, an "average" of particular emitters?

When we're say about 100 km above Earth's ground and look down to it and see the Amazonian region as green, is this green color a sort of "average" of...

Asked on 01/09/2021 by AccidentalBismuthTransform

2 answer

Path of a particle spiraling into a black hole

Consider a stationary Schwarzschild black hole: in a vacuum, no rotation, no electric charge. Using the Schwarzschild metric, we can draw diagrams describing how the radial coordinate $r$ varies...

Asked on 01/09/2021 by gamma1954

1 answer

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