Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [experimental-physics]

102 questions
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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 vapor used. I've read about methanol, ethyl…
HDE 226868
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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 accurate reading. The amount of time I should average is…
phujeb
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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
Daniel Donnelly
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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 water by diffusion but it's extremely slow - it will…
Nic
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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 measure the force required to push the buttons on the…
chesnutcase
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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 setup. I have great interest in graphene and…
0tyranny0poverty
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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 cN.m.
user33290
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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 units, I get my output in: kPa for stress and…
Fritz45
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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?
user17599
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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 subpixels are either ON (color) or OFF (black).…
james
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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 recommend a slightly flexible rod. I am going to use…
Fixieis
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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 that is the case, could a superhydrophobic coating…
user509
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Can one build an east-west compass using bismuth?

I am reading Oliver Sacks's memoir Uncle Tungsten, The book is remarkably interesting: he was a keen amateur chemist in his youth, and clearly a polymath.I was struck by this: "It was fascinating to see how a thin shard of bismuth (as near a needle…
Barnaby
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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 user's finger (It doesn't necessarily have to be…
NakedRaccoon
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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 required speed = 60 kmph (16.6 mps) -Maximum expected…
ywa1n
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