Questions tagged [experimental-physics]
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67
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161 views
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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0answers
33 views
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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1answer
40 views
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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2answers
103 views
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 ...
1
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1answer
47 views
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 ...
0
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1answer
66 views
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....
3
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2answers
709 views
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 ...
1
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1answer
48 views
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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1answer
34 views
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.)
...
0
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1answer
58 views
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 ...
1
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1answer
23 views
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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2answers
196 views
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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29 views
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 ...
2
votes
1answer
46 views
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 ...
1
vote
1answer
64 views
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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2answers
86 views
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 ...
1
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1answer
39 views
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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0answers
26 views
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 ...
3
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1answer
71 views
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 ...
1
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1answer
244 views
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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2answers
67 views
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 ...
0
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1answer
155 views
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 ...
1
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1answer
67 views
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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0answers
31 views
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 ...
0
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1answer
46 views
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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1answer
131 views
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 ...
0
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2answers
126 views
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 ...
2
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1answer
193 views
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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2answers
774 views
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?
3
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1answer
41 views
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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1answer
43 views
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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0answers
119 views
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 ...
1
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1answer
60 views
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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0answers
30 views
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 ...
1
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1answer
45 views
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, ...
2
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0answers
33 views
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 ...
3
votes
1answer
59 views
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 ...
2
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2answers
169 views
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 ...
2
votes
1answer
406 views
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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0answers
11 views
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 ...
2
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2answers
36 views
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 ...
0
votes
2answers
221 views
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....
4
votes
1answer
755 views
How can I accurately measure the actuation force of small buttons (<1cm diameter) using home equipment?
I'm trying to measure the actuation force of buttons on the Playstation Vita, in preparation of building an external device that presses these buttons automatically. Specifically, I'm trying to ...
0
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1answer
219 views
Ceiling or table fan better
I always wonder in directional flow which fan would send colder.air and cool better. I am biased toward table fan as it throws fresh air while ceiling fan throws stale hot air accumaled at top. Please ...
4
votes
1answer
59 views
Can graphene really be made in a modest lab at home?
I have seen some resources on the Internet that claim to be able to make sheets of graphene (single atom thick lattice of hex-bonding carbon) from commercial off the shelf materials and a modest lab ...
0
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1answer
968 views
What is the most efficient way to ionize air?
I have a project to convert wind energy directly to electrical energy with no moving parts. The wind will enter a reducing tunnel for concentration, then go through an unobstructing de-humidifier, ...
0
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1answer
51 views
Magnetohydrodynamics, ionizing combustion exhaust then converting its kinetic energy to electricity
I am trying to understand how to make generation of electrical power more efficient by using Faraday's law to directly convert the kinetic energy of the ionized or easily ionizable exhaust gases of ...
1
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2answers
168 views
What is smallest distance you can reliably move an object?
I am trying to design a science experiment involving lasers and want to know if what I am planning to build it technically feasible.
Part of the experiment requires that I make tiny nanometer changes ...
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2answers
117 views
Where is the contact point between screw spindle teeth and nut teeth?
So this is a screw press used to hmm disconnect the clamp connection (sorry if these are not the correct terms I really don't know how to translate it properly). Anyway, I think it's obvious what this ...
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0answers
33 views
Creating a rotating unit with the extended arms varying the trajectory in accordance to ODE's
I plan to mimic binary stars and their orbital decay due to gravitational wave radiation. I want to make a rotating shaft with extended arms, each being able to hold cast iron balls of specific weight,...
