Questions tagged [applied-physics]

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46 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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27 views

Why is the road hard to see when it’s wet?

Ok, pretend it’s night time and I’m driving down the road with my headlights on. If the road is wet, it’s harder to see; that’s a given. But why? I’d assume it’s because less of the light from my ...
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1answer
15 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
63 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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85 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
52 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
48 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
104 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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40 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
68 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
60 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
61 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
61 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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1answer
128 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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21 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
98 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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33 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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36 views

Mathematical Resolution of Overlapping Signals

I would like to take the opinion of physicists (my area is chemistry). During instrumental analysis, the output is a instrument response vs. time. Each peak corresponds to a molecule which is ...
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1answer
29 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
88 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
62 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
48 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
87 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
56 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
362 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
69 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
63 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 ...
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1answer
45 views

Stability of differently shaped gyroscopes

1) Would it be correct to state the following: "The longer the radial distance (the distance from the center of the gyro disc) and the lower the height from ground to disc, the greater the angular ...
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1answer
30 views

Effect of Bodyform on Air Resistance [duplicate]

Visualize those little pictures as the front of vehicles like airplanes and trains. I wonder if I am right about my speculation below, and if so, if somebody could explain the exact reason. Sources ...
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1answer
72 views

Does this illustration depict magnetic monopoles?

This illustration appears in Mechanical Design Of Electric Motors (Tong 2014). Does it depict monopoles? If so, how? If not, why?
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19 views

Can a mechanical forced oscillation of a gas column significantly affect diffusion rates through the column?

High Frequency Ventilation (HFV) is a special type of mechanical ventilation used in critical intensive care units. Rather than moving gas volumes in bulk at conventional breath rates, HFV operates at ...
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0answers
36 views

Screen distort for corrective lens

Can we apply a screen distort for corrective lens for eye ware instead of using a lens maker? Just test at home with a phone screen and buy at shop. To reframe the question can we bring to effect a ...
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1answer
61 views

How does the orientation of a television antenna affect picture quality? [closed]

I don't understand this and it's supposed to be with regards to polarization
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2answers
66 views

Physical processes taking place inside Germanium detectors

Reading about differences between Silicon detectors and Germanium detectors, I decided to learn a bit more about the latter, since I've always used Silicon detectors in all the experiments I worked ...
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1answer
81 views

Static temperature

A Professor of Fluid Mechanics a told that the static temperature is the temperature observed when the relative speed between observer(thermometer) and fluid is zero. I have trouble understanding as ...
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0answers
94 views

Why do we use ring shaped anode in photoelectric effect?

We used a ring shaped anode and photons produced by Mercury arc lamp directed toward the anode and strike on cathode surface. But why did not we just let the photons directly strike to the cathode? ...
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1answer
174 views

The relationship between mass and incline on an object's speed [duplicate]

I took my daughter and son for a ride in there Red Rider Wagon on the weekend. We went down a small incline on one block in our neighborhood. My daughter, who is 5 years old, asked me in her own way, ...
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1answer
47 views

How to determine the force of a spring-damper in 3D

This is not homework. I just often have to calculate forces between objects and I am interested in a systematic procedure for determining the forces. Imagine two point masses with mass $m_1$ and $m_2$...
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2answers
162 views

How does frictional force work?

I have read that frictional force is equal and opposite to the force that is applied on a body to move it from rest. Meaning Frictional force = -(m*a) So if there are 2 objects each of mass 100 kg ...
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2answers
57 views

Short Circuit Current [duplicate]

Theoretically, shouldn't there be no current flowing through a short circuit? Across the short circuit, the voltage is 0, and the resistance is ideally 0 as well. So how does it make sense for any ...
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1answer
47 views

Plausible/ creative assumptions for solving equation of radiation transfer

I'm currently looking at the equation of radiation transfer given by $$\frac{1}{c}\frac{\partial }{\partial t}I_{\gamma} + \hat{\Omega} \cdot \nabla I_{\gamma} + \left ( k_{\gamma, s} + k_{\gamma, a}...
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1answer
62 views

Specific Heat Ratio

So I've been researching about designing a rocket engine, when I came across the specific heat ratio. I found on the Braeuig.us website that they were able to get a number by finding the heat capacity ...
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1answer
190 views

How does a metronome allow such a wide range of tempos in such a short distance?

I've been working on a question for metronomes asking the following: Suppose a metronome can be treated as a double-weighted pendulum. Let $m_1$ be the mass of the metronome's movable weight, $l_1$ ...
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1answer
18 views

Transparency of atomic and sub atomic particles

Are atomic and sub atomic particles transparent if not then aren't we able to see particles of nitrogen and oxygen in air?
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68 views

Bike light: what consumes more current, continuously on or blinking?

I've been riding my bike many nights wondering the following question: What consumes my LED bike-light battery: the continuously on setup or the blinking setup? It might seem trivial, since the ...
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0answers
81 views

Efficiency of a dehumidifier with respect to temperature [closed]

I have just bought a dehumidifier to decrease humidity in my bedroom. I'm wondering if it takes more energy to work (assuming same liters of water condensed) in winter with cold temperatures or in ...
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0answers
80 views

If they were freely available, what would be potential applications of the magnetic monopole?

viz., if the magnetic monopole (the hypothetical fundamental particle, not the fauxmonopole behavior in BECs) was discovered, and then found to be abundant or easily produced, what could they be used ...
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2answers
131 views

can you explain how time dilation works in the following situation?

in the image suppose A is an observer. a box length of 1 light second is moving away from A with a velocity of half of the speed of light. a laser is shot from the front side of the box(C) to the ...