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DaveE's latest activity
DaveE
reacted to
berkeman's post
in the thread
I
Power transfer Halbach or dipole
with
Like
.
Can you please post some sketches for what you are considering? To be honest I still don't understand your previous thread, and this...
Yesterday, 8:55 PM
DaveE
reacted to
russ_watters's post
in the thread
Gravity Based Electricity Generator
with
Like
.
It will. You're just not connecting all the dots here. Energy and power are related by time. Do the math and figure out how long it...
Yesterday, 8:51 PM
DaveE
reacted to
sophiecentaur's post
in the thread
Gravity Based Electricity Generator
with
Like
.
The details of power, force and torque are much less relevant than the basic Energy equation. That's where the money lies. The...
Yesterday, 8:49 PM
DaveE
reacted to
Averagesupernova's post
in the thread
Custom UHF Yagi antenna build
with
Like
.
Can't have it both ways. A resistive pad will match the impedance at the cost of insertion loss. This may not matter depending on the...
Yesterday, 8:45 PM
DaveE
reacted to
russ_watters's post
in the thread
Baltimore's Francis Scott Key Bridge Collapses after Ship Strike
with
Like
.
Define "fixing". If a breaker trips and you turn it back on, is it fixed? [edit] Reading the report now. The cause of the blackout the...
Saturday, 9:04 PM
DaveE
reacted to
Vanadium 50's post
in the thread
Baltimore's Francis Scott Key Bridge Collapses after Ship Strike
with
Like
.
Will that kind of error be fixed by more rules, more paperwork and more bureaucracy? I have seen management try to increase safety by...
Saturday, 9:02 PM
DaveE
replied to the thread
Baltimore's Francis Scott Key Bridge Collapses after Ship Strike
.
I doubt that any complex working vessel is currently "up to code", even if they were once. It's a bit naive to think that things...
Saturday, 10:04 AM
DaveE
reacted to
Vanadium 50's post
in the thread
Most dangerous chemicals?
with
Like
.
I hold little hope for this thread as it was apparently just a drive-by stink bomb by the OP. But if people are trying to take it...
Saturday, 8:44 AM
DaveE
replied to the thread
Gravity Based Electricity Generator
.
The OP specified 500kg and >10KW. The only pertinent unspecified variable is how far the weight gets to fall; i.e. how long do you get...
Saturday, 1:23 AM
DaveE
reacted to
Dale's post
in the thread
I
How is Potential Difference Created across a Resistor?
with
Like
.
Yes. Note that during that non-stationary state you cannot use circuit theory as it violates the assumptions of circuit theory.
Friday, 9:12 PM
DaveE
reacted to
Baluncore's post
in the thread
A little help understanding 3 phase waveforms and summation
with
Like
.
Yes, but the phases are a differential voltage, so they subtract and are plotted here referenced to "neutral", plotted as white...
Friday, 1:41 PM
DaveE
reacted to
sophiecentaur's post
in the thread
A little help understanding 3 phase waveforms and summation
with
Like
.
Have you come across Phasor Notation in all your reading? It makes questions like this one very straightforward. By 'freezing' the...
Friday, 1:41 PM
DaveE
replied to the thread
A little help understanding 3 phase waveforms and summation
.
##sin(\omega t) - sin(\omega t +\frac{2}{3} \pi) = ## ##sin(\omega t) - sin(\omega t)cos(\frac{2}{3} \pi) - cos(\omega t)sin(\frac{2}{3}...
Friday, 1:20 PM
DaveE
replied to the thread
Most dangerous chemicals?
.
In the US they can prescribe it, but they won't. In practice it comes from specialists: Anesthesiologists (pain management), palliative...
Friday, 1:05 PM
DaveE
replied to the thread
Schools
Cornell vs. UC Berkeley for Engineering Physics
.
Look into housing availability and cost. The Bay Area is difficult in that regard. It's a great place to live, but everyone else wants...
Friday, 2:31 AM
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