Questions tagged [applied-physics]

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16 views

What is 'Int.' in NMR scans, listed next to Hz, MHz and ppm? [closed]

Does Int. mean 'intensity', perhaps? Somehow, I can't find an answer a st to what the numbers in the 'Int.' column mean.... Also, what does 変換 mean? Some NMR scan data include this Japanese (I ...
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47 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 ...
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12 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 ...
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2answers
27 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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15 views

Applications or work that has been done in Non-Linear dynamics or Chaos

I have almost finished my Non-Linear Dynamics course. I'm really interested in working on this field but first I want to see and study some of the work or application that has already been done in ...
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33 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 ...
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39 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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1answer
25 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 ...
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1answer
22 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 ...
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1answer
38 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 ...
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1answer
55 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 ...
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2answers
34 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 ...
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1answer
67 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 ...
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45 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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9 views

How might I go about creating a loose particulate filter to contain stage fog?

I've been trying to brainstorm ways to loosely contain particulates (eg from a fire or a fog machine) for an outdoors Halloween event. The main issue is that it all floats away too quickly, and going ...
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1answer
8 views

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 ...
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1answer
44 views

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 ...
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1answer
31 views

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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20 views

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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1answer
126 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} \...
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40 views

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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1answer
139 views

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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1answer
17 views

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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57 views

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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1answer
142 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?
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3answers
88 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 ...
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3answers
119 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 ...
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1answer
474 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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1answer
63 views

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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2answers
127 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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42 views

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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2answers
79 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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1answer
67 views

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.
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1answer
250 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,...
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2answers
64 views

Will thermal radiation of hot humid outdoor air cause a person indoor to feel warmer than if it were cool or dry outside?

The hypothesis is this: Water molecules, due to their asymmetry and electric dipole are particularly susceptible to radiation at specific frequencies. That suggests that excited water molecules will ...
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2answers
232 views

Irradiated Film Negatives from Chernobyl

The images attached are taken during the cleanup at Chernobyl. The white "streaks" at the bottom of each picture are said to be from intense radiation striking the film negatives, which makes sense (...
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23 views

Arranging objects by mass [closed]

I have n objects with different masses . Say mass of n1=m1, n2=m2 .... so on. I want to use concept of centrality in physics to arrange these objects in a field (computer simulation ) . Where object ...
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1answer
100 views

Scope of $E=mc^2$ [closed]

As far as I can see, Einstein's $E=mc^2$ is most often mentioned in the context of nuclear physics, even though it is more generally applicable. I understand that this is due to the large nuclear ...
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35 views

Optics that translates object to image by a constant amount

For some application I was interested in an optics s.t. for any incoming ray the outcoming ray is parallel to the incoming ray and shifted by a distance $d$ (independent of the incoming ray) along the ...
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16 views

Magnetic force and work done [duplicate]

If magnetic force do no work at all then how do magnets attract or repel each other?
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1answer
33 views

How does an magnetic resonance guided focused ultrasound (MRgFUS) machine work?

As a medical application, magnetic resonance guided focused ultrasound (MRgFUS), is new I the treatment of some parkinsonian diseases, prostate cancer, none problems, and more. However, I am not sure ...
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43 views

Can light concentrated through convex lens be “cooled down?”

I've just been assigned this biology design project where I'm being tasked to create a device for maximizing "sunlight exposure" of crops and am unsure of this particular question, for the design of ...
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2answers
112 views

Why are car brakes positioned at the center of vehicle?

In lots of cars, it is possible to see the location of the brake pads through the wheels. Indeed in the majority of cases it seems the brake pads are always located towards the center of the car, i.e....
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3answers
74 views

How does a gas spring work?

I read Wikipedia and do not understand the following. If you create pressure on the gas (or any spring) it gives pressure against. Why is the gas spring holding mass when pulled out, and while ...
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1answer
54 views

Microwave cooking

This is just a little curiosity I've had, and I wonder what y'all think: I am poaching a chicken egg in a small (about 4 in. diameter) glass dish in my microwave. Let's assume the microwave is set on ...
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2answers
96 views

How exactly does quantum mechanics play a role in our day to day life?

From my understanding, quantum mechanics applies mainly to small microscopic particles. When it comes to macroscopic objects, the wave functions collapse and the quantum mechanical properties are lost....
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1answer
98 views

What are phonon frequencies in solids? How are they related to the interaction potentials between the constituent atoms?

I was reading a paper on self-assembly of colloidal structures, where it was mentioned that only solids with real phonon frequencies are mechanically stable. And the authors go on to manipulate the ...
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1answer
986 views

Magnetic field of a solenoid vs a circular loop

Why doesnt the magnetic field inside a solenoid depend on its radius whereas the magnetic field inside a circular loop or a coil depends on its radius?Please explain using simple language keeping in ...
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2answers
150 views

Is it possible to generate energy by exploiting the hydrostatic pressure gradient?

Is there any way to harness the hydrostatic pressure gradient to generate energy? The pressure at the surface of an ocean is atmospheric pressure.As we descend down the ocean, the pressure increases ....
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1answer
82 views

Different types of mechanic jacks [closed]

I need help. I would like to know: what the differences between the jacks illustrated below are and with which jack a car can be lifted easiest (according to the answer sheet it is jack **B).** My ...