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Deriving the Cable Equation from Maxwell's Equations

My goal is to reach equation 12 on this wikipedia page: Cable Theory. The demonstration is usually done by making an infinitesimal circuit, but I would like to get there via Maxwell's Equations by ...
Ícaro Lorran's user avatar
-1 votes
1 answer
63 views

Okay, I know the risks. ( Amateur Rocket.) [closed]

I am currently attending a school for electrical science. A small group of students and our instructor are attempting group project to build a liquid fuel rocket. (I know it is a bit out of the scope ...
TylerTheSparky's user avatar
-1 votes
1 answer
88 views

Applications of Schrodinger's to dark solitons [closed]

The Schrodinger equation (SE) admits dark solitons as particular solutions. The SE and the The Korteweg-de Vries (KdV) equations can be used to model them. Questions: What are the applications of ...
mle's user avatar
  • 99
16 votes
5 answers
2k views

Calculating temperature when it is lower than your thermometers can read?

We have an old freezer. I believe the thermostat is broken and think it may run all the time. Food in it gets really cold (Ice cream like concrete). I've tried measuring the temp with a freezer ...
PStallings's user avatar
0 votes
0 answers
48 views

How would I calculate the heat change of compressed air?

My friend is working on a snow gun, which involves using compressed air to blow apart water coming out of a pressure washer. I read that you can cool air by compressing it, which makes it hot, then ...
h erinaceous's user avatar
0 votes
2 answers
286 views

Why does radar have a much longer range than infrared sensors? (in the context of military aircraft)

In the context of military aircraft and missiles, radars often have ranges of hundreds of kilometers, while thermal infrared sensors can only barely reach 100 km in the best of circumstances. But ...
JanKanis's user avatar
  • 540
1 vote
0 answers
64 views

Application of Schwinger-Keldysh formalism in various topics except cosmology

I want to find some theories or models on Schwinger-Keldysh formalism (in-in formalism) focusing on flat spacetime in terms of correlation functions. For example, I know there are many applications ...
0 votes
2 answers
358 views

Where special and general relativity must be used in engineering?

As I know Newton physics is used for most engineering, aerospace, mechanical, naval etc. Where we must use Theory of Special Relativity and Theory of General Relativity to get correct results, only ...
22flower's user avatar
  • 613
0 votes
1 answer
62 views

Why do some microwave meal instructions violate the 'Specific Absorption Rate' rule?

Do Microwave oven heating times grow linearly with Wattage? Calculating optimal heating time states that the product of the microwave power and cooking time should be constant. However, some meals ...
Gnubie's user avatar
  • 1,879
2 votes
0 answers
57 views

Predict color of dye under a certain wavelength of light?

I am picking fluorescent dyes to be put under a UV of known wavelength and would like to be able to predict approximately what color the dyes will appear under the light. I can request ...
Nadka's user avatar
  • 21
4 votes
2 answers
1k views

What technological advance would a room temperature superconductor allow? [closed]

I have read a recently published paper on arXiv where the scientists claim to have developed a superconductor material working at room temperature and pressure. While it is clear that the results - if ...
Vladimir Cravero's user avatar
1 vote
0 answers
9 views

What is the state of the art in nanophotonic biosensing?

Over a decade ago I've been doing research in nanophotonic biosensing and all the reviews from those times were very impressive. Some plasmonic structures were capable of single-molecule detection and ...
user46147's user avatar
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0 votes
0 answers
84 views

Physics in the kitchen: does heat transfer faster from air into oil or from air to food when in an oven?

It is usually said that foods cook faster in an oven when coated in oil. While I can understand that the underside of the food will cook faster where the oil forms an thermal interface between the ...
Dr Stu's user avatar
  • 425
0 votes
0 answers
103 views

Applications of infinite square well/particle in a box

I know of only two instances where the infinite square well is an adequate model for experimental behaviour: the absorption wavelengths of cyanine dyes, and extremely small semiconductors to which ...
Jackalope's user avatar
  • 101
1 vote
0 answers
37 views

Functionalizing iron oxide nanoparticles for antimicrobial activity [closed]

I'm working on my thesis which is about synthesis of iron oxide nanoparticles from a plant leaf extract and testing the particles activity on bacteria to measure their toxicity towards it. The thing ...
just asking's user avatar
1 vote
2 answers
100 views

Thermoelectric effect

Hey just learned about this thermoelectric effect in physics class, I was wondering why it is not used more often in the form of a thermoelectric generator in practical industrial applications. Would ...
Fakhryou's user avatar
0 votes
1 answer
107 views

How does CT imaging deal with the thickness of materials?

In the medical CT imaging field, image of an inspected object is obtained through xray projection. xray is attenuated by the inspected object through the formula $I=I_0e^{-\mu t}$. The projection $p$ ...
Winston Pan's user avatar
1 vote
1 answer
37 views

Pendulum similarity with a ball attached to a uniform disk with constant [closed]

A particle of mass $m$ is supported by a frictionless horizontal disk which rotates about a vertical axis through its center with a constant angular velocity $\omega$ . The particle is connected by a ...
MastergGM's user avatar
0 votes
1 answer
78 views

Millimeter Graph Curve Type Question

I have question regarding graphing on a millimeter graph, with which I'm sure most of you are familiar and I apologize for it's simplicity. For example, if I graph the period squared over the length ...
Tommy's user avatar
  • 1
0 votes
2 answers
50 views

How is it possible to receive 2 pulses from only 1 sent pulse?

If we have a sample of a certain material to characterize it The sample is a cube with side length (L=1m). You used an ultrasonic (US) transducer to send an US pulse of frequency (f=5MHz) at normal ...
Youssef Mohamed's user avatar
0 votes
2 answers
737 views

How do we deal with doppler effect in $3D$ space?

In $2D$ it's easy to deal with doppler effect given the velocity of the source and the velocity of the observer like in fig (1) where we have the observer at A static and the source in direction of $\...
Youssef Mohamed's user avatar
0 votes
1 answer
109 views

Questions about overdamping, critical damping and underdamping [closed]

I am a math lecturer and in my teaching of second-order linear differential equations I present, as an application, the classical mass-spring-dashpot system (and its RLC analogue). According to my ...
Dimitris's user avatar
  • 399
0 votes
0 answers
47 views

An invitation to brownian traps to capture or destroy viruses and bacteria

I'm interested for general feedback about modern brownian traps for viruses and bacteria. In my rememberings a related reference is a column added to the article in Spanish [1] (I don't remember well ...
4 votes
2 answers
148 views

Is there a guiding principle to determine when quantization is needed when modeling EM-matter interactions?

I'm an undergrad engineering student and I need some guidance to help me understand a few issues regarding classical electromagnetism (EM). I'm interested in engineering applications where there is an ...
tim_qc2022's user avatar
1 vote
0 answers
59 views

What's the difference in the quality of time evolution of MD vs QM?

In my research group, we're using molecular dynamics to estimate time evolution of molecules. Of course, the analogous calculations are unobtainable using time dependent Schrödinger equation using our ...
Mikkel Rev's user avatar
  • 1,356
0 votes
1 answer
91 views

Is it possible to exploit the exhaust air of a vacuum cleaner ? (Air blower, generator,…)

I am working on new design ideas for vacuum cleaner and I need help to understand fluid mechanics aspects. I have ideas about the exploitation of the air exhausted by the fan. First, I wonder if we ...
Gorzias's user avatar
-1 votes
2 answers
70 views

Can I use combustion gases for heating?

What is the temperature of the carbon dioxide gas released from combustion of wood? If I let the gases escape directly, then only some heat is transferred by the gas to the heating drum and the rest ...
Amit Agarwal's user avatar
1 vote
1 answer
39 views

Why don't the returning beams split a second time when they hit the half reflecting mirror in Michelson-Morley Experiment?

I understand the role of interference pattern in Michelson Morley experiment.I have just watched three videos, they all pretty much explain the set up in the same fashion. But none actually mentions ...
Kafi Kfishna's user avatar
1 vote
0 answers
30 views

Uses of antimatter in the present [duplicate]

Since the previous question by Jaime Soto is now nearly 12 years old, I wondered if there were any new practical Uses for Antimatter except PET and the treating of certain types of cancer. So, are ...
Orkawelle's user avatar
0 votes
1 answer
73 views

Running electrolysis on inside surface of a tube

I use electrolysis for rust removal and electroplating. I notice that when one of the electrodes is a closed tube or has other topological holes with a sufficiently large height:diameter ratio, the ...
Jason C's user avatar
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0 votes
1 answer
27 views

How can radioactive-dating techniques, such as uranium-thorium analysis, tell you when a human fashioned a tool out of a rock or coral?

This is an archaeology or anthropology question.... Scientists in a recent 'Nature' said they compared recent genetic analyses of theirs, concerning when Polynesian islands were first settled, with ...
Kurt Hikes's user avatar
  • 4,509
1 vote
1 answer
1k views

Does pressure affect heat transfer between two mediums?

I'm a self-taught Coca-Cola connoisseur and try to use science to be able to have the best taste possible in every glass. I usually try to get the bottles as cool as possible before opening them. I've ...
condosz's user avatar
  • 193
1 vote
2 answers
87 views

Reaction torque of angled nutrunner

I have a question regarding the behavior of an right-angled, air/electrical powered nutrunner. More specifically, the reaction torque that the operator is subject to during operation. When the ...
667788's user avatar
  • 11
13 votes
2 answers
3k views

Minimum speed that a bike won't fall over [closed]

I thought about this when riding the bike today: What is the minimum speed I have to go that my bike won't fall over with a given angle $\alpha$ of tilt, diameter $d$ and weight $m$ of a tire (let's ...
juliangst's user avatar
  • 163
2 votes
2 answers
369 views

How does the shear and bending moment diagram relate to the stress tensor field?

I've read a fair amount of material on the physics of elasticity. That mostly covers the states of stress and strain and their relationship at a point. I don't recall ever encountering the so-called ...
Steven Thomas Hatton's user avatar
0 votes
1 answer
24 views

How does plasma coating of textiles work?

I recently heard a podcast episode on plasma, where they mentioned that one of the major applications of plasma physics today is the coating of fabrics, for example for producing rainproof jackets. ...
rumtscho's user avatar
  • 200
0 votes
1 answer
696 views

What is the working principle of a bamboo cannon in terms of energy physics?

A typical bamboo cannon consists of a large bamboo node or tube containing some water to which a little calcium carbide (or kerosene) is added. Bamboo cannon's popular in Malaysia, Indonesia, and ...
firewalker's user avatar
3 votes
0 answers
90 views

Applications of Dynkin Diagrams in Physics [closed]

I've been studying Dynkin Diagrams for a while, but I can't grasp what are the applications in physics. Can anyone help me understand where can we use Dynkin Diagrams in particle physics to "...
RKerr's user avatar
  • 1,213
0 votes
1 answer
51 views

Is there any way to focus the mechanical vibration or stress of an object? [closed]

I am looking for a way to focus the vibration of a metal sheet at a specific point on that sheet so that other points vibrate less. Just like light and lens. Is there any way to focus the mechanical ...
zeynab 's user avatar
1 vote
2 answers
48 views

Why is the partial molar volume of interest? [closed]

I have to present a technique for calculation of the partial molar volume of molecules (using the 3D reference interaction site model). I'm trying to find some possible applications for the partial ...
SineOfTheTimes's user avatar
1 vote
1 answer
81 views

Please Give a Few Examples of the Schrodinger Equation in Use [closed]

I know the schrodinger equation has valuable uses in the creation of computers, lasers etc, but how exactly in the construction of these devices is the equation used? Under what circustances does the ...
Lambda's user avatar
  • 4,711
3 votes
2 answers
255 views

Interactive physics simulations and animations

What are some free and open-source interactive simulations, illustrations, animations, demonstrations, videos, calculators and other resources for experimental physics and mathematics like the Wolfram ...
0 votes
0 answers
92 views

Is the natural frequency of the damping system equal to the natural frequency of the forced oscillator? For example a bridge and people walking

When resonance occurs, there is a maximum transfer of energy from the driver to the forced oscillator. This means that the damping system should have the same frequency as the forced oscillation ...
Phoooebe's user avatar
  • 220
2 votes
2 answers
263 views

Hydraulic jack and pascal's law

When using the hyraulic jack , I am totally convinced that the pressure at the initial phase must be the same in the interconnecting liquid and both surfaces where force is applied (pascal's law) , ...
noor 1's user avatar
  • 69
0 votes
0 answers
53 views

Wind turbines or tidal power stations incorporating elements of origami or reconfigurable materials: is innovation possible from physics?

If I refer well (I'm not a physicist) one of the oldest uses/applications of renewable energy is to try to exploit the wind and tides by means of designs of machines: windmills and water wheels. Today ...
user250478's user avatar
7 votes
2 answers
2k views

Physics of "force spreading" on impact on a surface

Consider a plate $P$ of thickness $d$ (for example a plate of wood) laying on a hard surface $S$ (for example on concrete floor). Suppose you have a maximum value of pressure $p_{\mathrm{max}}$ $S$ ...
Sarah's user avatar
  • 171
0 votes
1 answer
222 views

Internal energy and conservation of momentum

The book says that if the net of all external forces acting on a system equals zero, the system's(centre of mass of the system basically) momentum is conserved. But what if some internally stored ...
user266637's user avatar
0 votes
2 answers
88 views

Applications of nanomechanics

What are applications of nanomechanics beyond its use in atomic force microscopy? The question is specifically about the existing applications rather than the potential/future ones (which are quite a ...
Roger V.'s user avatar
  • 60.3k
0 votes
1 answer
133 views

Can I build a cuvette for 400-700 nm using simple microscope slides?

I want to measure the absorbance spectrum of some solutions, in the 400-700 nm range. I've always used regular "optical glass" cuvettes for this. But I've been wondering, is this really ...
Juan Perez's user avatar
  • 2,982
1 vote
1 answer
99 views

Radiation and windows for building of a great project in a low Earth orbit: reference request or exercise as a ficticious need to build it

I know about the existence of certain windows for which it is more suitable to launch a probe for the exploration of a cellestial body in our Solar System (see the Wikipedia Launch window). I wondered ...
user250478's user avatar

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