Questions tagged [applied-physics]

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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 ...
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2 answers
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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 ...
2 votes
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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 ...
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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 ...
-1 votes
2 answers
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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 ...
1 vote
1 answer
28 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 ...
1 vote
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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1 vote
1 answer
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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 ...
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2 answers
61 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 ...
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13 votes
2 answers
2k 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 ...
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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 ...
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1 answer
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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. ...
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1 answer
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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 ...
3 votes
0 answers
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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 "...
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1 answer
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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 ...
1 vote
2 answers
42 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 ...
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1 answer
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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 ...
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2 votes
2 answers
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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 ...
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0 answers
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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 ...
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2 votes
2 answers
168 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) , ...
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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 ...
7 votes
2 answers
769 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 $p_{\mathrm{max}}$ $S$ ...
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1 answer
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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 ...
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2 answers
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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2 answers
149 views

Radio wave speed in air

Couldn't Google credible answer. What is accepted constant in applied physics to estimate radio wave speed in earth atmosphere near water surface? Taking on account humidity inside few meters off ...
1 vote
1 answer
199 views

Accurate method or instrument to measure density of shaving cream foam or whipped cream foam?

I am currently filling a "standard" stainless steel cup of known volume with foam and then I weigh it. Then I calculate density. This method is pretty messy and I have to be careful about how I fill ...
1 vote
0 answers
55 views

Are there any real life applications of Quantum Field Theory (QFT) [duplicate]

When searching for QFT's applications, most articles and answers tend to mention how it is used to expand our understanding of physics, e.g. with the LHC. So I'm wondering if you know of any ...
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1 answer
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Cars' wear resistance, quietness and water drainage dependence on thread pattern on tires?

Why can tires with fine thread patterns increase cars' wear resistance, quietness and water drainage? What is the logic behind? The following is the tire ad I saw: Nowadays, under the premise of ...
0 votes
1 answer
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Moment of inertia of a Cardan/Hooke joint?

I'm working on a model that approximates a rotating body as a double Cardan joint: one of these guys. In my scenario, torque is applied to the center shaft and both end shafts are free. The angle ...
1 vote
1 answer
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How does ultrasound imaging localize points in the $x$-$y$ plane?

Lots of sources describe how ultrasound imaging uses the time differences between wave emission and reception to calculate distances to points in the body. This makes sense for how localization works ...
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Areas of physics and physical scenarios where jerk comes up [duplicate]

I am a high-schooler and I learnt that the third derivative of displacement with respect to time$\left(\frac{d^3s}{dt^3}\right)$ is known as jerk. I am curious to know where does this come up in ...
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3 votes
1 answer
206 views

What are real world applications of the Duistermaat–Heckman formula?

In the famous 1984 paper "The Moment Map and Equivariant Cohomology" by Atiyah and Bott, an equivariant de Rham theory was presented in relation to the Duistermaat–Heckman formula $$ \int_M e^{-itf} \...
1 vote
0 answers
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How (if possible) can I measure a pulsed signal with a lock-in amplifier?

I am trying to simulate free-field acoustic conditions using a pulse technique - i.e. send an acoustic pulse from source to receiver, and measure only the initial response, cutting out all reflections ...
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1 answer
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Applications of analytical mechanics in real life [closed]

I'm currently taking a course of analytical mechanics, I'd like to read more about it. I'm interested in reading about what kind of appliances are there for analytical mechanics in computer science or ...
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1 answer
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Methods of delibirately patterning a thin film interference pattern on glass

I'm not sure if this question is too much of an applied physics question for this platform. If so, my apologies, consider it not asked :) I'm wondering if there are any existing techniques to create ...
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Wind energy as a function of speed and temperature

My fellow windsurfers, most of whom have little knowledge of Physics, all agree that the force of the wind when sailing in the Northeast of Brazil, where the weather is warm, is much less than where ...
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1 answer
290 views

Hydraulic analogy for electrical compounds

I want a source (website or a book) where there are hydraulic simulation (or analogy) for all (or at least the most useful) electronic compounds?
1 vote
3 answers
171 views

Pressure done by a bar/beam inserted in a continuous medium (wall)

Related to a DIY project, I'm facing the following question: Assume a metal bar (beam) of square section, $a \times a$, is inserted partially in a continuous medium (lets say, a wall) in a way that ...
0 votes
3 answers
411 views

Is it possible to have a situation in which velocity of the particle is never 0 but its average velocity in an interval is 0?

My book states that-" It is not possible to have a situation in which speed of the particle is never 0 but the average speed in an interval is 0" I would like to know if the same holds true for ...
2 votes
1 answer
933 views

Electromagnetic wave and skin depth, skin effect

In EM theory concept of skin depth is induced which is a measure of how much a EM wave can penetrate the medium, from it arises the concept of skin effect which is for EM wave but we use this to ...
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1 answer
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How do LCDs vary light intensity?

What exactly happens when an electric field is applied? Say we're dealing with a TN LCD, in a 'normally white' mode. With no voltage applied, the orthogonal grated plates cause the director of the LC ...
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2 answers
296 views

Why does a torpedo travel farther than a bullet underwater?

We know that to move in water we require more energy. Even shooting a gun, the bullet travels a very small distance. But how could torpedoes move so fast inside the water? If they have such an energy ...
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1 vote
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All the electric fans in my apartment have started simultaneously producing a high frequency sound. Why?

I woke up last night hearing an odd high pitched noise that I am not used to. I usually keep a few fans running because I have a train that runs nearby and the white noise blocks it out. I tried ...
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181 views

Practical applications of modern particle physics? [closed]

I'm a wholehearted supporter of scientific discoveries. "IFLS!" Nevertheless, I'm curious what non-scientists gain from unlocking the mysteries of the universe. I found a lot of articles like these: ...
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1 answer
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Railroad train on tracks [closed]

What keeps the railroad trains on the tracks? P.S: It is not the flanges, as already remarked by Dr. Richard Feynman. I want a detailed explanation of this question, if possible. Thanks.
0 votes
1 answer
472 views

Elastic potential energy per unit volume,stress-strain and strain-stress curve

From what I understand, when we calculate elastic potential energy per unit volume of a material which extends linearly, we calculate the area under the graph of stress- strain OR strain- stress graph,...