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Jan
13
revised As a car turns around a circle, why does the force of static friction point towards the center of the circle
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Jan
13
answered As a car turns around a circle, why does the force of static friction point towards the center of the circle
Jan
1
comment Can there be energy with no force or energy with no power?
Is it not the particle/dust that is curving spacetime, which would be a force?
Jan
1
comment Can there be energy with no force or energy with no power?
I read the question differently, but sure if theoretical alternative universes are allowed then sure perhaps a forceless energy would be possible. But not in the one we currently live in.
Jan
1
comment Can there be energy with no force or energy with no power?
I made no claims on persistence; but unless it was a single particle (thus not exerting gravitation on itself), which is not really accurate since it would still consist of quarks exerting internal forces on each other, it would have to be the only mass in existence in the entire universe to exert no force. Even a single particle billions of lightyears away would exchange some force.
Jan
1
comment Can there be energy with no force or energy with no power?
Are you saying that the universe itself is energy with no force or power (providing there's nothing else in a multiverse for it to interact with)? Otherwise, radiation pressure in a vacuum would exert forces on its container, and anything with mass would exert graviational forces on everything else.
Jan
1
answered Can there be energy with no force or energy with no power?
Jan
1
comment Can there be energy with no force or energy with no power?
Rest energy necessitates mass, would exert gravitational forces on everything around it.
Dec
31
comment Why Two Equal Resistors Cut Voltage in Half?
@reddead that is correct. When twin same valued resistors are put in series, they double the total resistance, when in parallel they half it. The resistors themselves maintain the same value. Similarly, when you put two 'twin' batteries together their voltage adds.
Dec
30
comment Why Two Equal Resistors Cut Voltage in Half?
If you have a 10k and a 3k, then add another 3k, the total is now 16k, so the 10k now drops 62%, and each 3k drops 19%. The equivalent values resistors still drop an equivalent amount of voltage.
Dec
30
comment Why Two Equal Resistors Cut Voltage in Half?
Now you're changing this, but you have to evaluate percentage OF TOTAL. Two 3k resistors in series = 6k ohms, each taking 3k/6k = 50%. A 3k and a 10k resistor in series = 13k ohms, the 3k taking 3k/13k = 23% and the 10k taking 10k/13k = 77%.
Dec
30
answered Why Two Equal Resistors Cut Voltage in Half?
Dec
30
comment When does the wagon-wheel effect occur?
The effect being described in the question does not necessitate two wheels or a strobing light source, it can be observed with a single wheel and continuous light source.
Dec
30
comment When does the wagon-wheel effect occur?
What do $f_1$ and $f_2$ represent in the context of a single spinning wheel?
Dec
25
comment Could this planetary superalignment happen?
The sun does count. Many 'planetary alignments' are based on aligning 'in the sky', and being collinear without solar inclusion. Here's an example of such an alignment: modernsurvivalblog.com/wp-content/uploads/2011/05/…
Dec
25
comment Could this planetary superalignment happen?
I want 8 planets, a star, and the Earth's moon to be in alignment. 10 bodies.
Dec
25
comment Could this planetary superalignment happen?
Thanks for the info, I'll review the details when I get a chance. I'm beginning to realize that what I'm after is something different than the typical definition of planetary alignment, and includes a solar and lunar alignment in the same gravitational direction, in other words Mars through Neptune are across the Sun.
Dec
25
comment Could this planetary superalignment happen?
@Qmechanic I have read it, and I disagree that it applies to this question. I'd be happy to discuss in chat.
Dec
25
revised Could this planetary superalignment happen?
added 39 characters in body
Dec
25
comment Could this planetary superalignment happen?
I'm only interested in said planetary alignments to demonstrate a maximal upper bound on planetary alignment effects (and likelihood/frequency) to provide a response to these 'zero-g day' posts. I want this to contain a full response for anyone googling 'zero g days' or gravitation effects of planetary alignments, thus the information is important (to me).