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Dale's latest activity
Dale
replied to the thread
I
Electric Potential in circuit
.
So that formula doesn’t really apply. There are no solitary point charges in that circuit. There is a continuous distribution of surface...
Yesterday, 5:22 PM
Dale
replied to the thread
I
Electric Potential in circuit
.
Is that formula supposed to be the voltage at a point or the voltage due to a point charge? Read the surrounding text carefully
Yesterday, 2:08 PM
Dale
replied to the thread
B
Conceptually understanding change in potential energy with 0 net work
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It is more that net work is different from total work. The net work is the net force times the displacement of the center of mass...
Yesterday, 9:27 AM
Dale
replied to the thread
B
Conceptually understanding change in potential energy with 0 net work
.
This actually is not the case. The net work being zero just means that the KE did not change. It does not imply that any other forms of...
Yesterday, 8:50 AM
Dale
reacted to
jbriggs444's post
in the thread
A
Rotation speed for a particular system under gravity
with
Haha
.
Right you are. I was already working through that. I have an explanation for how it plays out and a plan for how to solve the cubic. You...
Thursday, 4:34 PM
Dale
replied to the thread
A
Rotation speed for a particular system under gravity
.
Oh, right. It isn’t quite a central potential because the force depends on the second derivative of the radial coordinate.
Wednesday, 7:01 PM
Dale
reacted to
jbriggs444's post
in the thread
A
Rotation speed for a particular system under gravity
with
Like
.
This assumes that the light weight is negligibly massive compared to the heavy weight. Otherwise, I believe that the kinetic energy...
Wednesday, 6:03 PM
Dale
replied to the thread
A
Rotation speed for a particular system under gravity
.
This would be a central force with a ##r^0## force instead of the usual ##r^{-2}## force...
Wednesday, 4:34 PM
Dale
reacted to
Ibix's post
in the thread
I
Transition of spherically symmetric gravitation
with
Like
.
Yes - see Oppenheimer-Snyder collapse for a fleshed-out example. It'll start as soon as he sees something start to move, which would be...
Wednesday, 9:35 AM
Dale
replied to the thread
I
Transition of spherically symmetric gravitation
.
Symmetries in spacetime are given by Killing vector fields. These are standard GR vectors, so they are covariant. They reflect the...
Wednesday, 7:14 AM
Dale
replied to the thread
Electron Spin and current-induced magnetic fields
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The direction of the field is not a real direction. The direction of the magnetic field is a convention, specifically the right hand...
Monday, 8:08 PM
Dale
replied to the thread
Electron Spin and current-induced magnetic fields
.
It is clockwise because most people are right handed so clockwise follows a right hand rule. If most people were left handed we could...
Monday, 11:34 AM
Dale
reacted to
Ibix's post
in the thread
I
Handshake paradox involving the Starship Enterprise
with
Like
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They are Lorentz boosted, which turns out to be the Minkowski spacetime analog of a Euclidean rotation, but they are not rotated in the...
Monday, 5:42 AM
Dale
reacted to
collinsmark's post
in the thread
I
A new interpretation of Quantum Mechanics
with
Like
.
Here's a few. Wavefront sensing with prisms for astronomical imaging with adaptive optics "A scenario where a read out noise of 5...
Sunday, 1:06 PM
Dale
reacted to
PeroK's post
in the thread
I
Handshake paradox involving the Starship Enterprise
with
Like
.
That's absolutely correct! Newtonian physics: absolute space and time; but no invariant speed (of light). Special Relativity...
Sunday, 11:51 AM
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