Questions tagged [experimental-physics]

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Mounting APC E-2000 fibre terminator to Thorlabs parts

I am building an optical setup that consists of Thorlabs parts. The laser for the system has a pigtail that uses an APC E-2000 fibre terminator type. Thorlabs does not sell any compatible parts for ...
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Calculations of a sphere

I apologize if the question is very basic, I admit I'm not the best at math and physics. I am doing an experiment with a sphere, the measurements are as follows: The sphere has a diameter of 330 mm (...
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Do asperity junctions break every time a machine starts to rotate?

After reading CONTROL OF MACHINES WITH FRICTION by Brian Armstrong-Helouvry, some questions rised. The main question I ask you is: Suppose two metal surfaces in relative motion first in static ...
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Is there a way to simulate the drag effect created by acceleration while in a stationary object?

There was a video of a train that had tvs in the windows so it appeared the rider was moving across the landscape. If the train was stationary the passenger would not believe the ride was real because ...
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I'm trying to source an electric motor for a conversion project but I can't properly calculate power required

Okay, here's the specs (approximate) and calculations I've done -Total mass (after passengers and everything) = 1000kg (W = 9800 N) -Coefficient of drag = 0.4 source -Frontal area = 2 m2 -Maximum ...
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Measuring force with wireless strain gauges on wheelchair handrims

I have done an experiment using two different wheelchair tire types (large and small volume) to document differences in push force over a course of obstructions that simulate cracks, bumps, curb cuts, ...
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Can modern residual stress measurement replace finite element calculation?

Residual stresses are created by the manufacturing process and exist in materials and structures. Now, people develop many methods to measure residual stresses. Those methods can be divided into ...
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Expanding a small rubber ring

I have a bunch of small rubber rings that I need to conduct testing on. The rings start at about 15mm ID, and need to expand to 65mm and be held there for months. Right now, my solution for expanding ...
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2 answers
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Dissolved gas release from liquid

I wish I could directly embed this video here https://youtu.be/Syb3MHtjojQ It can be seen that no external chemical has be put into the bottle, so the bottle content has clearly not been modified. A ...
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How much electricity does it take to polarize specific types of insulators?

as I hope you know, electric polarization is when you put an insulator in an electric field, and the nucleus and electron cloud go in an opposite direction. https://www.priyamstudycentre.com/2020/02/...
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Unstable System. Error Trying to model the Red Bull Stratosphere Free Fall

I tried to model a problem months ago and still I can't solve, I don't want forget this problem so I would like to share what I tried and if you know what is happening with my graph. This is the ...
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Why is the theoretical formulation not explaining why the graph of the square of the velocity and angular displacement is nonlinear (experimentally)?

So I did a wind tunnel experiment where I put a rope restrained (1 degree of freedom, so it can wave in the direction of the wind) at one end so that it displaces according to the variation in wind ...
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Static discharge inside a fuel tank

I am trying to build a sort of paramotor powered by hydrogen, my rough design looks like this; First dilute sulfuric acid is electrolyzed in a sealed aluminium container. Second, the valve is ...
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How would I drop something directly in the middle of a vertical pipe?

Not sure if this is the right place to ask, but it is for a physics experiment. I'm trying to find out how the internal diameter of a copper pipe affects the time it takes for a magnet to drop through....
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Unit of "cN.m" used on torque wrench

I'm using a torque wrench whose unit is cN.m. I wonder what unit this is, and how to convert N.m (Newton meter) to ...
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1 answer
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Trajectory of the center of mass of a vehicle

The problem is to find the trajectory of the center of mass of a car when it is rotating and translating (after an off center collision, for instance) What i know as input is the trajectory of the ...
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Conceptual question about rotational and translational kinetic energy

My real life problem is to calculate initial translational and angular velocities of a vehicle in a loss of control to a stop. (The vehicle will translate and rotate about it's center of mass.) ...
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If aboard a train being driven along a track by centripetal force, would it feel like you were on a regular straight track?

Question: If aboard a train being driven along a track by centripetal force, would it feel the same as if you were on a regular straight track? I hope this isn't subjective, I think there is a right ...
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How can I measure the flow rate of CO2 gas from two different canisters?

I am looking for some help regarding one topic. I am designing one soda maker and thinking to include a 12g CO2 canister into it as my design only allows that size to incorporate . Now I know ...
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meaning of "hysterisis"in simple words?

I have tried to learn about "hysteresis" from different engineering knowledge sources and what i am able to understand that in simple words or nutshell, it is delay between output and input ...
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How does the number of cycles for averaging in a lock-in amplifier relate to low-pass filtering and where do I set it?

Please forgive me if I ask too many questions at once or I am too much of a rookie. I want to understand the working-principle of lock-in amplifiers (LIAs). I understood the calculation that yields ...
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2 votes
1 answer
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Can air be ionized using microwaves?

I have been doing a good bit of research lately into a new form of electric "jet engine" developed by researchers in Wuhan, China; in the article summarizing the technologies used to produce ...
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Specifications of Tensile Test Specimen?

I am Currently Working on Measuring Various Mechanical Properties of Metalic Materials using Universal Testing Machine (UTM) at Various Temperatures. I know that for Testing at Ambient Conditions, ...
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2 answers
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Turbulent boundary layer development in channel flow

I'm currently working on my Bachelor's thesis about the numerical simulation of a turbulent air flow through a rectangular channel. As part of that I'd like to compare my results to empirical ...
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1 vote
1 answer
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How do you exactly measure distribution functions?

Once we study vector calculus, we are all set to describe physical fields such as velocity fields , electromagnetic fields etc. The study makes sense to me mathematically but I can not imagine how we ...
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Practical estimation of magnetic force

I'm trying to estimate the magnetic force which develops on a truss-like ferromagnetic structure (I want to estimate the motion of the object) in a uniform magnetic field, and I came to realize that I ...
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3 votes
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Unit Conversion for Mass Density

I am doing a Finite Element analysis of a continuum. In my problem definition I use these units: mm for length, kPa for applied stress, and MPa for material stifness (Young's modulus). With these ...
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How to measure the power output of a stirling engine

I'm doing a project for thermodynamics where I have to measure the power (work over time) of a Stirling engine for varying temperature differences. I don't necessarily need an exact answer (as in: ... ...
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2 answers
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What is the maximum actuator strength allowed by physics? [closed]

What is the strongest actuator (that can exert a controlled amount of force & be able to start/stop) that an infinitely advanced civilization (e.g. only limited by the laws of physics) could ...
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1 answer
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Break loose torque calculation of lock nut against rotating/acceleating bolts?

I have a Scenario where my lock nut is tightend using a prevailing torque of 14 Nm (as mentioned by the manufacturer) on to the rotor placed between bearings (But the tightening direction and the ...
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1 vote
1 answer
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Help me build a mechanical gizmo involving a pulley (I think)

Electrical engineer here. I'm looking to build an incredibly simple mechanism that in my mind involves kind of a pulley. Below is a diagram. So it's essentially like a mechanical servo. I would like ...
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Designing a submersible cooling system for rapid flow hot nitrogen gas [duplicate]

I'm trying to design a cooling system for cooling nitrogen at 300°C. My original design (which is very open to modifications) is an aluminum ring block with exterior fins and vertical holes through ...
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Issues creating a high pressure chamber for corrosive solution

I'm trying to do an experiment on high pressure's effect on the electrical impedance of a really corrosive solution. I'm aiming for at least 2,000 psi with a pressure chamber but the only material I ...
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-1 votes
1 answer
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Could a spinning permanent magnet's interaction with the Earth's magnetic field propel a boat through the water?

I am wondering if a spinning permanent magnet's interaction with the Earth's magnetic field will produce a propelling force strong enough to propel a toy boat through the water. This propelling force ...
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2 answers
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How to measure and verify ultrasound frequency and intensity from a cheap ultrasonic body contouring device?

Research shows that applying 1 MHz non-focused ultrasound at 3 W/cm2 may reduce subcutaneous fat thickness. In fact, high-end and expensive (costs $5000 >) HIFU ultrasonic transducers are now being ...
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2 votes
1 answer
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Calculate the specific surface area of a mesoporous sample

I'm a nanoengineering student who's been stuck on the following problem for a few days. I've gone back over my professors slides, watched podcasts from an old professor, etc. etc., but don't ...
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How can I vaporize metals?

What are some common ways that I can vaporize Metals into a vacuum chamber? How can I keep these Metals in a gaseous state?
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1 answer
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Can chemical vapor deposition chambers be used to lay down thick layers of metal?

Can CVD Chambers be used to lay down thick (~1 mm) layers of metal?
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1 answer
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Measuring beats/bounce in a closed cubed glass

Suppose that we have a $2$ by $2$ by 2 $cm^3$ closed box, made up of glass, with thickness $0.1 cm$. Yes, it is a very small box. Let's say in that box there is a ball (also made with glass) with ...
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Equation for water rower

I have this water rower (Sunny Health & Fitness Water Rowing Machine w/LCD Monitor) : I am going to make a monitor for it (to calculate time/500m and watts). I am going to attach a magnet to the ...
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1 vote
1 answer
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Measuring intensity of a radio wave reflected from a metal plate

I am building a Project that can pinpoint location of a pen or any object (something as small as 0.5 mm radius sphere) placed on a flat screen. I am using a ultrasound sensor (initially but i can ...
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1 vote
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How can I develope a water loop cooler system sustaining with liquid nitrogen? [closed]

Water will be circulated in the water pipe and liquid nitrogen tanks heat going to cool the water pipe,by the way to the water too. And fan is going to blow this cold air and heat is going to be ...
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1 vote
1 answer
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AirFlow Measurement

I'm a software developer, who wants to create a monitoring system for an industrial airflow system. The airflow of the system is huge - between 15 and 20 cubic liters per minute. Here is my problem, ...
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2 votes
0 answers
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How to apply the permeability value found from an experiment?

I have done a permeability experiment on LDPE in the presence of air using a 25mm circular specimen. At 30'C, the permeability was found to be 1.846 barrer. Now I am trying to apply this permeability ...
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3 votes
1 answer
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Different Color Intenensities from simple ON/OFF RGB subpixels

I recently got interested in an electronic paper. One design that I liked was the one from Mirasol, Interferometric modulator display. However, what I don't understand, is the following: Their ...
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2 votes
2 answers
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Buoyance+torque generated force

I need to design a pivot arm which is pulled up by a float (buoyancy force). In the upper positions of the lever arm, there's a mass trying to pull down. The reason that I'm presenting this problem ...
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2 votes
1 answer
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What is the difference "maximum" shear stress and shear stress

Shear stress is introduced in statics as $\frac{P}{A}$. However, the maximum shear stress with neutral axis is different. It is $\frac{3P}{2bh}$ (Where $b$ is width and $h$ is height) What is the ...
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How to combine ODE parameters values from several estimations?

I would like to perform parameters estimation for a differential equation from experiment. If the value of these parameters are obtained from several experiments (repetitions) where for each ...
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2 answers
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Simulate Dust Layer on PV Cell?

Is it possible to simulate a layer of dust deposited on top of a PV cell in a controlled manner? One potential method I had was to put a given weight of a particulate/powder (chalk powder, talcum ...
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Difference between partial derivatives and derivatives in physics [closed]

Please explain me the difference between $\lim_{x->0}\frac{\partial E}{\partial x}$ and $\lim_{x->0}dE/dx$.In physics I encountered something similar while reading about Newton's Law of Fluids....
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