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Apr
27
comment Calculate relativistic boost to COM frame from two arbitary velocities?
it's towards the end of the the relativity chapter which talks about the relativistic mechanics of colliding particles. Yes, it goes into the conservation of the total 4-momentum, but says nothing about a general formula for the COM frame
Apr
26
comment Calculate relativistic boost to COM frame from two arbitary velocities?
Yes, but I was thinking of a relativistic boost
Apr
26
revised Calculate relativistic boost to COM frame from two arbitary velocities?
added 26 characters in body; edited title
Apr
25
asked Calculate relativistic boost to COM frame from two arbitary velocities?
Apr
22
comment Weak equivalence principle tests
I now feel that I've been intellectually violated by Uncle Al. And here was me thinking all these years that Uncle Al was too intelligent to be a deluded crackpot and therefore a misunderstood genius.
Apr
21
comment What is the displacement of an accelerated and relativistic object?
@bad boy I queried the comment you made to my answer which is perfectly ok to do. You still use the same ruler to measure the displacement of light as you would a car moving at low velocities. It's still displacement.
Apr
20
comment What is the displacement of an accelerated and relativistic object?
@BadBoy could you give me an example where displacement has an effect on light properties?
Apr
20
answered What is the displacement of an accelerated and relativistic object?
Apr
20
comment What is the displacement of an accelerated and relativistic object?
-1 "is a mathematical equation, not a physical one" acceleration, velocity, time, displacement are physical quantities in that equation.
Apr
15
comment Is the energy conserved in a moving frame of reference?
what did you use to draw the nice diagram?
Apr
14
comment Is the energy conserved in a moving frame of reference?
"This increase in velocity perfectly cancels out the loss in energy of the block" huh? you're comparing velocity and energy! Also, momentum conservation only works in the x direction, because you have an external force gravity acting along y.
Apr
14
comment Is the energy conserved in a moving frame of reference?
"There are several explanations why it seems that energy is not conserved". No, there is only one correct explanation. And if the mass of the inclinded place is much larger than the box, then it's change in energy approaches zero, so you only need to consider the change in energy of the box.
Apr
13
answered Is the EmDrive, or “Relativity Drive” possible?
Apr
13
comment Can relativistic kinetic energy be derived from Newtonian kinetic energy?
apologies for not making it clear that I'm looking for a derivation of relativistic kinetic energy. I'm thinking of relativistic kinetic energy of a particle as consisting of an infinite number of infinitesimal Newtonian kinetic energies, and this total must be conserved, but I don't know how to get at it for a derivation.
Apr
13
revised Can relativistic kinetic energy be derived from Newtonian kinetic energy?
added 24 characters in body
Apr
13
asked Can relativistic kinetic energy be derived from Newtonian kinetic energy?
Apr
7
accepted Is the change in kinetic energy of a particle frame independent?
Apr
7
comment Is the change in kinetic energy of a particle frame independent?
Even so, I find it unintuitive that an electron moving through a static E field in some frame, undergoes the same change in its KE for increasing velocity; while the corresponding change in KE in its instantaneous comoving frame appoaches zero.
Apr
5
asked Is the change in kinetic energy of a particle frame independent?
Dec
27
answered Why doesn't an electron accelerate in a circuit?