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7 votes
1 answer
599 views

Can using different types of alcohol in a cloud chamber produce different particle tracks?

The design for a cloud chamber is rather simple, and many factors can be changed without producing different results. There is one curious point that I've stumbled upon, though: The type of alcohol ...
HDE 226868's user avatar
  • 2,485
4 votes
1 answer
1k 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 ...
chesnutcase's user avatar
4 votes
1 answer
63 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 ...
0tyranny0poverty's user avatar
4 votes
1 answer
198 views

How small can you get a stream of molten steel to be at low pressure?

I'm designing a crucible / extruder, and right now it has a .6mm hole to extrude from. Will this work? A chart with various metals listed would be nice. Pictures: Click to expand
HighAsAKiteOnMath's user avatar
4 votes
2 answers
200 views

Thermoplastics that are permeable to water - high diffusion coefficient

I want to know if there are some fairly common thermoplastics that allow water to pass through (by diffusion) at a relatively high rate (on the order of days). For example, PET water bottles leak ...
Nic's user avatar
  • 291
4 votes
2 answers
499 views

How can I determine how many cycles to average for when taking a measurement using Lock-in Amp if I know sensor spectral noise density?

I am taking a phase sensitive measurement of an AC magnetic field using an SR830 Lock-In Amplifier and a magnetic sensor. I know I have to average over a number of measurement cycles to get an ...
phujeb's user avatar
  • 41
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
3 votes
1 answer
200 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
3 votes
1 answer
49 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?
user17599's user avatar
3 votes
1 answer
63 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 ...
james's user avatar
  • 268
3 votes
1 answer
195 views

Recreating Focaults Pendulum

I am having issues building a recreation of Focaults Pendulum (basic, inexpensive, undergrad project). At this point, I am going to purchase aircraft cable or suspension cable unless someone can ...
Fixieis's user avatar
  • 33
2 votes
1 answer
803 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 ...
user15001's user avatar
2 votes
3 answers
1k views

Can superhydrophobic surfaces be used to reduce drag?

I am mainly interested in reducing drag in aircraft and I have an idea that I want to learn more about... Can a superhydrophobic coating reduce drag in water-craft such as boats and submarines? If ...
user509's user avatar
  • 31
2 votes
2 answers
254 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 ...
Joaquin Osses's user avatar
2 votes
2 answers
38 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 ...
Andi Gu's user avatar
  • 123
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
2 votes
1 answer
93 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
2 votes
1 answer
144 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
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
2 votes
0 answers
34 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 ...
I.vdM's user avatar
  • 21
2 votes
0 answers
51 views

Could magnets at the RHIC be damaged like the ones at the LHC were in 2008?

In 2008, an electrical fault led to a freaky magnetic quench at the Large Hadron Collider, which in turn released a lot of helium, damaging dozens of superconducting magnets in the process and setting ...
HDE 226868's user avatar
  • 2,485
1 vote
4 answers
2k views

Variation of LED light as a function of distance

I'm trying to use LED's as a point source of light for a project I have. a crucial idea is that the intensity of the light of the led falls off as 1 over the distance squared as we move away from it. ...
perla's user avatar
  • 11
1 vote
2 answers
1k 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?
user17599's user avatar
1 vote
2 answers
288 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....
gateprep's user avatar
  • 123
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
1 vote
2 answers
52 views

How to find out experimentally without electronic or electrical instrument to measure the vibrational frequency of some type of spring

How to find out experimentally to measure the vibrational frequency of some type of spring without electronic or electrical instrument? I am just wondering about the advance stage of the discovery of ...
Victor's user avatar
  • 203
1 vote
3 answers
279 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 vote
1 answer
758 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
1 vote
1 answer
75 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 ...
Vanush Vee's user avatar
1 vote
1 answer
69 views

On construction of a triangular interferometer like LISA [closed]

I am planning to do a project in which I plan to mimic the LISA interferometer. For this I use the fabric material, Lycra to mimic space time and use spherical balls, forming a couple and connected to ...
Spoilt Milk's user avatar
1 vote
2 answers
38 views

How do measures of error or uncertainty change, when the underlying variable is transformed?

If I have a measurement $A$ with uncertainty $\Delta A$, then what is the error if I do a calculation like $\frac{A}{\sqrt{3}}$?
davidaap's user avatar
  • 111
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
  • 11
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
81 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
70 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 ...
user avatar
1 vote
1 answer
44 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 ...
bms's user avatar
  • 113
1 vote
1 answer
64 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 ...
user177195's user avatar
1 vote
1 answer
55 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, ...
Георги Няголов's user avatar
1 vote
2 answers
214 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 ...
Elenesski's user avatar
  • 111
1 vote
2 answers
171 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 ...
M. Wother's user avatar
  • 351
1 vote
0 answers
10 views

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
1 vote
0 answers
283 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
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
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
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
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
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
1 vote
1 answer
302 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 ...
TobyTobyo's user avatar
  • 111
1 vote
0 answers
180 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 ...
Scott Gibbard's user avatar