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Questions tagged [experimental-physics]

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What type of low-power fan or blower should I use to ensure continuous flow of mist/water vapor into a water bath for studying heat exchange?

I plan to perform a lab experiment where a mist generator produces warm mist at a rate of approximately 5-10 liters per hour. This mist will be directed through a pipe to which I wish to attach a ...
Afeefa Rahman's user avatar
0 votes
0 answers
33 views

Fuel cell power output

I've spent innumerable time over the years looking for commercially available hydrogen / oxygen fuel cells that might actually be usable in one project concept or another. The best I've ever managed ...
Slartibartfast's user avatar
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0 answers
15 views

Single Photon/Electron Emitter

Is it possible to buy single photon/electron emitter in market for experimental purposes? If yes, can you please guide me where and how?
Ok-Virus2237's user avatar
1 vote
3 answers
275 views

Calculating velocity of two different weight in a system with spring

I get a question like this. But what if the angle is given as theta=60° and I'm required to find the velocity of each weight. I tried the work energy equation but it doesn't seem to work since there ...
Fishing Cat's user avatar
-1 votes
2 answers
73 views

Electricity generation from sand particles in airstream hitting surface [closed]

I read an experiment which demonstrated that metal filings fired at a surface using air blasts charges the particles, surface and airstream. I understand this is triboelectricity, resulting from ...
El Flea's user avatar
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1 vote
1 answer
80 views

Developing a solar powered traditional river boat [closed]

I am currently in Indonesia with fellow students working on a project to experiment and build an alternative energy source to propel boat with optimal efficiency and also to minimize the use of diesel ...
KML's user avatar
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0 answers
68 views

How to make a galilean cannon with balls falling/rebounding straight

Here is what I mean by galilean cannon, simply letting balls fall, but hard to experiment though... First, I tried to drop 2 balls with my hands, but balls do not rebound straight and I get enormous ...
Dlouna.J's user avatar
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0 answers
19 views

what kind of Vibration Motor should I choose and how can I achieve my goal?

I'm building a vibration table for testing the durability of a metal rack, I want the vibration motor to create an even and average vertical displacement to the table, what kind of Vibration Motor ...
Loo's user avatar
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0 votes
1 answer
52 views

Transportation and storage of atomic weapons

I’ve been reading into the ministry of defence recently, and my question in general is this: Considering that the UK and US have so many nuclear weapons, how do they: store the nuclear weapons (isn’t ...
James Charlie's user avatar
0 votes
0 answers
35 views

Accelerate an object in a current-carrying coil

I'm currently trying to come up with some concept ideas for a physics game / riddle. The player has to get an object from one side of a horizontal, current-carrying coil to the other end of the coil ...
Phazis's user avatar
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0 answers
22 views

Optimize real-world experiment with discrete variable

I have a system to test, and I must choose the value of variable that optimize the response of this system. Let me say that I have 7 variable, each of them setted at 3 different level, with a full ...
Mattia Piron's user avatar
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0 answers
29 views

Period of oscilation of thin plate in the form of circular section

A thin plate of mass m in the form of a circular section of radius R and angle alpha is hanged to oscillate back and fort from a horizontal support. Find its period of oscillation. I am confused how ...
alpha's user avatar
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0 votes
1 answer
119 views

Which has more density: 100 °C steam or 100 °C dry air?

I am aware of the fact that steam is lighter than dry air. But I want to understand if it is merely because of the temperature difference.
Koushik Sarkar's user avatar
0 votes
1 answer
98 views

Spring constant of angled beam

I'm trying to solve for the dynamics of three blocks, shown below. Two blocks are pushed into a central shuttle, and their force is transmitted through a thin angled beam/pawl. The pawl bends when ...
asyndeton256's user avatar
0 votes
1 answer
95 views

Help me understand the mechanics involved in performing a wheelie

I am a mechanical engineering student trying to understand the mechanics of a wheelie (a maneuver). Can someone explain to me the mechanics behind performing a wheelie? With a free-body diagram. And ...
mike_1234's user avatar
0 votes
2 answers
186 views

gear size selection for a compound gear system to fulfill a specific output ratio

I need help creating a compound gear system that will result in the sought after drive ratio or very close to it. Naturally gear teeth need to be whole numbers. Websites like 'GearGenerator' (dot-com) ...
Inventor Moe's user avatar
0 votes
1 answer
18 views

Calulating the compression deformation using strain data measured by strain gauge _ material engineering

I'm studying material engineering and conducting some experiment. The experiment was measuring the strain of long steel bar. The bar is compressed from left side and deformed shortened. Using strain ...
조범희's user avatar
0 votes
1 answer
57 views

what speed must a bullet be fired at to turn into gas when hitting a steal plate

what speed must a bullet be fired at to turn into gas when hitting a steel plate. from watching this video on 9gag, i see that the bullet almost turns into liquid, what speed would it need to hit it ...
X3R0's user avatar
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0 answers
92 views

What is the effect of a diffuser or nozzle placed upon the inlet of an axial fan?

New to physics, I'm studying a mechanical method to increase the distance at which a standard axial fan can be more effective pulling smoke from a larger distance, while reducing the negative effect ...
Nic1337's user avatar
1 vote
0 answers
281 views

Working principle of Ranque–Hilsch Vortex Tube

I am not able to understand the reason for temperature separation and flow reversal in a counter-flow vortex tube refrigeration system. As per some sources, "Compressed air is passed through the ...
MechaTrex's user avatar
  • 395
2 votes
1 answer
98 views

How to make the magnetic field intensity from a DC electromagnet bigger without changing its current, number of turns, or geometry?

I'm currently doing a project on magnetic haptic feedback using DC electromagnet. The principle of my haptic feedback system is very simple (figure shown below): A permanent magnet is stuck to the ...
NakedRaccoon's user avatar
0 votes
1 answer
27 views

Determining the balancing force for a system of unequal masses for given scenario (angular-momentum, moment-of-inertia, thought-experiment)

Have already asked this on physics-site but has been closed. As such trying here! This question is basically a thought experiment. Let's say there are two pulley's P1 and P2 having equal radius R and ...
Ravindra HV's user avatar
0 votes
0 answers
68 views

How to calculate the Knudsen number?

when calculating the Knudsen number: $$ Kn=\frac{\lambda_{mf}}{L} $$ Where $\lambda_{mf}$ is the mean free path of a molecule, and $L$ is the characteristic length. How is the characteristic length ...
HWIK's user avatar
  • 3
0 votes
1 answer
65 views

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 (...
principemestizo3's user avatar
0 votes
0 answers
41 views

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 ...
el_maxx's user avatar
0 votes
2 answers
47 views

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 ...
1.21 gigawatts's user avatar
2 votes
2 answers
118 views

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 ...
ywa1n's user avatar
  • 23
1 vote
1 answer
57 views

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, ...
thebanks's user avatar
0 votes
0 answers
34 views

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 ...
yuxuan's user avatar
  • 149
2 votes
1 answer
91 views

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 ...
Georgije Stanisic's user avatar
0 votes
2 answers
173 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 ...
huenma's user avatar
  • 11
0 votes
0 answers
35 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/...
user35044's user avatar
0 votes
1 answer
65 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 ...
rubengavidia0x's user avatar
1 vote
2 answers
107 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 ...
Peelo's user avatar
  • 11
1 vote
1 answer
110 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 ...
Rayyan Javed's user avatar
0 votes
1 answer
71 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....
prata's user avatar
  • 103
3 votes
2 answers
1k 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 ...
user33290's user avatar
1 vote
1 answer
167 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 ...
Igor Mello's user avatar
0 votes
2 answers
115 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.) ...
Igor Mello's user avatar
0 votes
1 answer
72 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 ...
David Nolan's user avatar
1 vote
1 answer
80 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 ...
Salmeen's user avatar
  • 11
1 vote
2 answers
246 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 ...
DSP_CS's user avatar
  • 273
0 votes
0 answers
55 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 ...
AskingBecauseIHaveQuestions's user avatar
2 votes
1 answer
139 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 ...
CJL's user avatar
  • 21
1 vote
1 answer
115 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, ...
user464141's user avatar
0 votes
2 answers
104 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 ...
Simon Henn's user avatar
1 vote
1 answer
40 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 ...
user avatar
1 vote
0 answers
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 ...
NMech's user avatar
  • 24.4k
3 votes
1 answer
197 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 ...
Fritz45's user avatar
  • 133
1 vote
1 answer
747 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: ... ...
Alexander de ranitz's user avatar