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Dale's latest activity
Dale
replied to the thread
Physics education is 60+ years out of date
.
Interesting. That data doesn’t seem particularly dire to me. From the paper "We find that a majority of faculty respondents report...
Yesterday, 7:05 PM
Dale
replied to the thread
I
What are Killing vectors?
.
There are also Killing vectors that represent rigid rotations. And Born rigid accelerations too.
Yesterday, 6:51 PM
Dale
reacted to
ohwilleke's post
in the thread
Physics education is 60+ years out of date
with
Like
.
I'm skeptical of the article's claims, especially with respect to lower division physics classes. In those classes, the idea is to...
Yesterday, 5:59 PM
Dale
replied to the thread
Physics education is 60+ years out of date
.
I don’t have access to the full article. In the abstract the authors claim “Computing is central to the enterprise of physics but few...
Yesterday, 4:12 PM
Dale
replied to the thread
Physics education is 60+ years out of date
.
Note that the main distinction between this post and the previous thread is the recent Nature Physics article. Please focus on...
Yesterday, 4:06 PM
Dale
replied to the thread
I
Is the Poynting Vector Field the Only Factor in Energy Flow in Circuits?
.
Yes, for example in a battery. The E field points from the positive terminal to the negative terminal, and the current goes from the...
Yesterday, 9:39 AM
Dale
replied to the thread
I
Is time dilation a real effect?
.
That is correct. The GPS defines coordinates (that is its purpose), so it accounts for time dilation with respect to those coordinates.
Yesterday, 6:45 AM
Dale
replied to the thread
I
Is time dilation a real effect?
.
As others have mentioned, you have to decide what “real” means for your question to have meaning. The term “real” in this context is not...
Yesterday, 6:19 AM
Dale
reacted to
Nugatory's post
in the thread
I
Which theory of time is the most evidence-based?
with
Like
.
Achieving a decent undergraduate-level understanding of special relativity through self-study is not necessarily unrealistic - more...
Sunday, 9:15 PM
Dale
replied to the thread
I
Falling through the event horizon of an evaporating black hole
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Yes, I misunderstood that. The paper doesn’t describe the metric I thought it did. It has the same limitations as the Viadya metric...
Sunday, 3:26 PM
Dale
replied to the thread
I
Falling through the event horizon of an evaporating black hole
.
I am fine with that criticism. IMO, that goes along with the click-bait style of the title, which I don’t like. To me, that is not a...
Sunday, 2:16 PM
Dale
replied to the thread
I
Falling through the event horizon of an evaporating black hole
.
Not any Penrose diagram specifies a metric that satisfies the energy conditions considered in this paper. If the metric for the standard...
Sunday, 1:14 PM
Dale
replied to the thread
I
Which theory of time is the most evidence-based?
.
In that context I like the fact that you asked to compare the various interpretations in terms of experimental evidence. That is a good...
Sunday, 7:21 AM
Dale
reacted to
Ibix's post
in the thread
I
Which theory of time is the most evidence-based?
with
Like
.
Spacetime is a manifold with a metric and a connection. You can use a coordinate system to identify events within it, but it isn't...
Sunday, 7:09 AM
Dale
replied to the thread
I
Falling through the event horizon of an evaporating black hole
.
Hawking never made a model that showed that claimed that a black hole could both form and evaporate. Hawking only proposed a model...
Sunday, 6:33 AM
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