DO NOT USE THIS TAG just because the question deals with a law of physics!
16
votes
4answers
2k views
Why do 'dead' batteries work again after exchanging the places of the batteries in an electronic device?
My camera, which is powered by two AA batteries in series, would not power on. I removed the batteries, exchanged their locations, and the device worked again - for another 15 minutes or so.
The ...
10
votes
14answers
9k views
Best (most realistic) physics game? [closed]
Inspired by a similar post, I wanted to know what video games, past or present, most accurately employ the laws of physics.
I believe this is an appropriate question for this site, since the users ...
9
votes
2answers
709 views
What happens to matter in a standard model with zero Higgs VEV?
Suppose you reset the parameters of the standard model so that the Higgs field average value is zero in the vacuum, what would happen to standard matter?
If the fundamental fermions go from a finite ...
6
votes
4answers
156 views
Is energy extensivity necessary in thermodynamics?
Given a partition of a system into two smaller systems, the energy $U$ is devided into $U_1$ and $U_2$, with
$$U=\mathcal{P}(U_1,U_2):=U_1+U_2,$$
so that $U_2$ is given by $U-U_1$. Here the ...
5
votes
2answers
129 views
Superconductivity reasons (Intutitive)
Superconductivity
I read in a book "Physics - Resnik and Halliday" the explanation of Type-I Superconductors{cold ones} that:
The Electrons that make up current at super-cool temperatures move in ...
4
votes
2answers
113 views
Can we write down a dynamical law of physics which is totally non-deterministic?
In classical mechanics, $F=ma$ tells us how to evolve a system at time $t=t_0$ to $t=t_0+dt$.
In quantum mechanics, the Schrodinger equation gives us a similar recipe.
These equations are, in a ...
3
votes
2answers
765 views
Do the laws of physics work everywhere in the universe?
Do the laws of physics change anywhere in the universe?Or will they change from place to place in the universe?
3
votes
2answers
81 views
Evolution principle of the physical laws
I wanted to know if there is a physical theory that considers that the laws of physics undergo an evolutionary process. That see the law of physics or the absence of them, as something dynamic, and ...
2
votes
2answers
289 views
Why didn't Newton just propose the 2nd Law and leave it at that?
Why didn't Newton just propose the 2nd Law ($F=\dot{p}$) and leave it at that? The 2nd Law implicitly contains the first, doesn't it? If so, it seems he wasn't following his own Rule #1 of Book 3 of ...
2
votes
4answers
332 views
Laws of Atomic Theory - how is this possible?
Not sure if this is the right place to post, but how is it possible to have laws of a theory?
A theory is not able to be a law, since it's just an explanation that can always be disproven. So how is ...
2
votes
2answers
688 views
Does negative temperature in Carnot cycle yield a counterexample of the second law of thermodynamics?
By Carnot Theorem, the efficiency of Carnot cycle is$$\eta=1-\frac{T_C}{T_H}$$
where $T_C$,$T_H$ are the absolute temperature of the cold reservoir and hot reservoir respectively. Since $T_C > 0$, ...
2
votes
3answers
266 views
Why is it thought that normal physics doesn't exist inside the event horizon of a black hole?
A black hole is so dense that a sphere around it called the event horizon has a greater escape velocity than the speed of light, making it black. So why do astronomers think that there is anything ...
2
votes
2answers
98 views
How can we claim something violates some physical law, when so many physical laws have been postulated?
For example, Einstein postulated that the speed of light, c, is constant in all inertial frames of reference.
Bohr postulated that electrons go around the atom in ...
2
votes
2answers
204 views
Should the term Watt's Law be used?
I'm revising some electrical curriculum for a technical training program. In the curriculum students have to calculate values using Ohm's law and the equation Power = Current * Voltage (or P = IV).
...
2
votes
1answer
171 views
Laws of physics and general relativity
I'm reading that general relativity let's us describe physics from the point of view of both inertial and accelerated observers. What does that actually mean in terms of doing actual physics? For ...
1
vote
1answer
153 views
Aren't all physical relations non-linear?
It is well-known that Hooke's Law is only approximately true and thus that linear relation
is merely an idealization not strictly corresponding to the reality. Wouldn't it be necessary/appropriate ...
1
vote
2answers
108 views
Has there been any serious work in how the world would look if basic physical laws were changed?
Has there been any serious work in investigating how the world would look if certain basic physical laws were changed?
Like if gravity or electromagnetism laws were changed to have different ...
0
votes
3answers
243 views
Action - Reaction pair, through photons
Here's an example to describe the issue
Supossed a high power laser (eg a 100 kW laser, ie, electromagnetic weapons)
is fired to a target, then it will receive energy and move.
(and likely to burn or ...
0
votes
6answers
318 views
Are the laws of physics applied mathematics? [closed]
This questions started with a question I had about gravity. If two objects of different weights fall to the earth at the same rate of acceleration, then it seems to me that gravity is in some ways ...
0
votes
0answers
65 views
Laws of the universe [closed]
I was thinking the other day, What gives the universe laws to follow by? I know there are plenty of laws like the Newton's laws of motion. But, Is there some grand master of all these laws?
Like ...
0
votes
0answers
18 views
What exponential time dependiciens depends also on temperature?
Are there any laws in nature, which shows exponential decay (or growth) and which also depends on temperature?
For example, don't any chemical transformations demonstrate exponential law? I think ...
