for questions about design, process, data, or analysis of experiments and observations.
0
votes
0answers
2 views
Need an intermediate resistivity part/material
I need a part or material for a planned experiment (the experiment is similar to those described in my articles http://arxiv.org/abs/1208.0066 and http://arxiv.org/abs/1109.1626 ). The problem is that ...
-1
votes
0answers
31 views
Improve heat transfer on frying pan design [closed]
I have a design for an industrial frying pan which will have $T_{Oil} = 500 K$
So the idea is to submerge copper pipes with this dimensions:
$thickness = 5 mm$
$inside_{diameter} = 50 mm$
...
10
votes
3answers
518 views
Best way to chill a cup of coffee with cold water and 5 minutes [duplicate]
Initial data
1 x 3/4 full cup of hot coffee / tea / your favorite morning beverage
cold water
5 minutes
Considering that it's starting to get hot outside, and we all want to drink reasonably cold ...
3
votes
1answer
46 views
Have general relativistic effects of all of the components of the stress-energy tensor been measured?
The stress-energy tensor is:
Have general relativisic effects of all of the components of the stress-energy tensor been measured? I've heard that the accelerating expansion of the universe is due to ...
1
vote
0answers
51 views
Toward the establishment of non-equilibrium (quasi-equilibrium) magnon BEC theory
In 2006, Demokritov et al have reported that they have achieved the observation of quasi-equilibrium magnon Bose-Einstein condensation (BEC) in YIG at finite (room) temperature by using the method ...
1
vote
1answer
41 views
1/2 freeze a water bottle
Is it possible to quick freeze half of an unopened bottle of water or soda by putting half of the bottle in a subfreezing solution liquid nitrogen or other solution without freezing the whole bottle?
1
vote
0answers
43 views
Calculation of magnetic force magnitude from a parmenant magnet
I was wondering how strong a magnet should be in order to be able to horizontally attract 0.2 Kg of pure iron at a distance of 0.3 M. Since I know nothing about magnets, I started looking for ...
1
vote
0answers
21 views
Can TOTEM's T2 detector measure differential cross sections?
My current research involves making a prediction for data collected by the TOTEM experiment at the LHC. The experiment is primarily designed to measure the total inelastic and elastic scattering cross ...
0
votes
0answers
56 views
Experiments for Introductory Physics [closed]
I am currently self-studying introductory physics. I am reading a textbook (Sears and Zemansky, 5th edition) and doing the exercises. I also have recently taken a high school physics lab class, and ...
1
vote
1answer
46 views
Use something that slower than light in Michelson–Morley experiment
Follow by the Michelson–Morley experiment, What happen if we use something that has a speed lower than light instead of light in Michelson–Morley experiment? How about the result?
1
vote
2answers
42 views
How would a diffraction pattern change if the atoms were triangular instead of spheres?
On a related note, what's a good book/source that would answer questions that go very in depth with these kinds of "what if" questions because I am also asked the same if the atoms were long cylinders ...
3
votes
0answers
49 views
How is the Geometric Phase measured in the experiment?
I had read some papers that have mentioned the geometric phase (Berry phase) can be used to detect the quantum phase transitions in a quantum many-body system. My question is: How is it measured in ...
2
votes
1answer
40 views
Creating a stream of single file atoms
How do you go about creating a stream of single file atoms?
The aim is to fire a stream of single file atoms (hydrogen, helium) down a vacuum and detect there arrival on the opposite end. Any ...
-4
votes
0answers
31 views
Basic force in gravity responsible for attracting everything including nonmetal [closed]
Why do things get attracted? It is said that there is a magnetic field around the earth, but how can the attraction of non-metals be explained in terms of magnetic fields?
How can one generate this ...
-4
votes
0answers
24 views
Is there any technique by which we can increse the speed of a car using the weight of the passenger in a car or bus? [closed]
Is there any technique by which we can increase the speed of a car using the weight of the passenger in a car or bus?
3
votes
1answer
78 views
What is the Coandă effect? How is it defined, and what causes it?
Can anybody explain to me the Coandă effect well? I am finding that many definitions and explanations conflict.
I am particularly confused about the following points regarding the Coandă effect:
...
6
votes
3answers
139 views
Has relativity of simultaneity been directly observed?
I know that thought experiment about trains when a flash of light in the middle reaches the both end simultaneously for a passenger but different times for the bystander.
So were there (non-thought) ...
2
votes
1answer
46 views
What are the theoretical prerequisites for experimental work with SEM and TEM? [closed]
What level of knowledge and in what areas would be required to perform experimental work with an SEM (Scanning Electron Microscope) and a TEM (Transmission Electron Microscope) respectively? E.g. ...
3
votes
3answers
102 views
Newton's First Law of Motion; Empirical Aspects
Newton's first law states that in an inertial frame, a body at rest continues to be at rest, and a body in constant rectilinear motion continues its motion, unless an external force is applied upon ...
0
votes
0answers
24 views
How to interpret temporal coherence in Young's double slit experiment with single photons?
I have a problem with understanding what is the role of coherence in such experiment. Taking the Dirac's statement that photon interferes only with itself, it's fairly understandable, that single ...
1
vote
0answers
37 views
How the value of permitivity of free space is determined?
when electric charges are placed on the medium then force of interaction between them decreases. We say this factor permitivity of the medium. The force of interaction between the charges is max if ...
-3
votes
0answers
25 views
a experiment including magnets and electrons [closed]
I was getting started designing a machine the has the same structure of a atom by using negative and positive sides of magnet then one more magnet is added the magnet is turn to the posited side ...
0
votes
0answers
10 views
$SiO_2$ PVD deposition to HDPE (plastic)
Is it possible to deposit $SiO_2$ onto HDPE plastic parts (Fresnal Lens)? Will the deposition
disrupt infra transmission?
0
votes
0answers
13 views
Potential E alternation
Considering a permanent magnet moving in a trajectory perpendicular to a straight wire of a given lenght, in a way that the magnet expose always the north face towards the wire, no matter the ...
15
votes
0answers
265 views
Best current bounds on nonconservation of momentum?
It's not straightforward to test conservation of momentum experimentally, and many experiments that seem like tests really aren't. For example, in a Newtonian system of identical particles that ...
2
votes
1answer
59 views
Easy to do experiments that clearly show outstanding properties of graphene
By chance we received for free some monolayer graphene sheets (20 cm x 20 cm) and mixed coper-graphene wires at our University. I would like to prepare some very easy to do experiments for the ...
17
votes
4answers
425 views
How can I determine whether the mass of an object is evenly distributed?
How can I determine whether the mass of an object is evenly distributed without doing any permanent damage? Suppose I got all the typical lab equipment. I guess I can calculate its center of mass and ...
1
vote
1answer
40 views
Interpreting the results
I have preformed the muon lifetime experiment at my uni's lab, and got the data. It's text file with 8190 numbers. My TDC unit was set so that the time gates were at 10 $\mu s$, and it has 8192 ...
1
vote
0answers
95 views
Easy question about magnetism?
I have to build a simple electric motor by attaching a magnet to a battery, extending the terminals of the battery (with stiff wires so they could act as supports), and placing a coil of wire on top ...
4
votes
2answers
91 views
Optics alignment of a confocal scanning microscope
I am facing a challenge in my project regarding optical alignment.
See the figure:
The challenge is with the vertical optical system alignment. I considered placing a mirror and check back if the ...
4
votes
1answer
122 views
Mechanical Equivalent of Heat
Recently I have been looking up James Joule's experiment regarding the mechanical equivalent of heat. After viewing some drawings of the apparatus, I assumed that the lines holding the weights would ...
3
votes
0answers
58 views
List of cross sections?
Sometimes I need to look up a certain cross section, say the inclusive Z production cross section at $\sqrt{s}$ = 7 TeV. Is there a place where 'all the' cross sections are tabulated ...
4
votes
2answers
79 views
Cosmological triangle with PLANCK results
Is there an updated version of the cosmological triangle with recent PLANCK results included?
2
votes
1answer
99 views
Experiment to find Ammeter Resistance [closed]
I've been studying experimental electrodynamics and I needed to describe an experiment to find the resistance of an ammeter if I just have the ammeter together with one voltmeter and a protection ...
7
votes
0answers
104 views
Status of experimental searches for tachyons?
Now that the dust has settled on the 2011 superluminal neutrino debacle at OPERA, I'm interested in understanding the current status of experimental searches for neutrinos. Although the OPERA claim ...
3
votes
2answers
34 views
Concerning Scattering Intensity and Particle Concentration
I am trying to determine what governs my sensor output. I have an optical sensor that emits infrared radiation on a sample volume and gives me a voltage output from the scattering of (1 to 10 micron) ...
0
votes
0answers
41 views
Experiments related to Capacitor and Prism [closed]
I want my students to learn experiments on prism and capacitor. Can you provide me different experiments related to prism and capacitor (except charging and discharging). The experiments will be given ...
8
votes
1answer
167 views
How the inverse square law in electrodynamics is related to photon mass?
I have read somewhere that one of the tests of the inverse square law is to assume nonzero mass for photon and then, by finding a maximum limit for it , determine a maximum possible error in ...
0
votes
1answer
104 views
measuring electromagnetic induction
There is a famous law which says that a potential difference is produced across a conductor when it is exposed to a varying MF. But, how do you measure it to prove? It is quite practical.
...
-2
votes
1answer
120 views
Can thought experiments qualify as actual research?
I wondered whether thought experiments actually can be substituted for actual experimentation. I understand that in some cases it might be necessary, but can it be unnecessary over thinking sometimes? ...
9
votes
3answers
393 views
Can we measure an electromagnetic field?
As far as I can check, the Aharonov-Bohm effect is not -- contrary to what is claimed in the historical paper -- a demonstration that the vector potential $A$ has an intrinsic existence in quantum ...
4
votes
1answer
96 views
How important is it, really, to clean vacuum parts?
In every lab I've seen, people are quite meticulous about cleaning parts that are to be used in ultrahigh vacuum, as well as the components of the chamber itself. The parts may be put in an ultrasonic ...
2
votes
2answers
96 views
Parabolic motion (experiment)
We performed a laboratory, performing six releases of a sphere with angles $15^\circ,30^\circ,45^\circ,60^\circ,75^\circ,40^\circ$ a parabolic movement, took five distances for each angle, the initial ...
2
votes
0answers
52 views
Robot controling pouring process from a bottle
I need to solve a problem within mechanic of fluids for a part of my thesis. Robot will pick up a bottle of beer, cola, julebrus or any other kind of beverage. And then it has to bring it to the glass ...
1
vote
1answer
21 views
Are “timed” measurements actually revealing error-distributions of the measurement apparati?
A thought experiment:
Given some object moving (swinging) from left to right and back with constant velocity, imagine a camera set up to take a picture of the scene at a fixed interval so that we can ...
2
votes
1answer
121 views
What is Transverse Energy?
What is transverse energy? Why we use transverse total energy instead of energy and transverse momentum in place of Total momentum in the particle detectors?
3
votes
1answer
46 views
Planes of graphite crystal on diffraction experiments
When doing electron diffraction on graphite (a popular experiment for students at universities) always diffraction at these two planes with distances $d_1$ and $d_2$ are observed:
But a plane ...
3
votes
1answer
76 views
Explain background pattern in particle tracing image
I'm trying to understand this image of a particle tracing experiment (which can be found all over the net if you google for "bubble chamber"):
(
There are two things that I can't figure out:
The ...
5
votes
1answer
99 views
Whistling on bottle tops
It is well known that if you blow horizontally on a bottle top it creates a sound. Pouring water to the bottle changes the pitch.
I have been doing experiments on the relation between the sound's ...
0
votes
1answer
138 views
How do you find (initial) velocity using conservation of energy?
Without mass; only time, distance, and height is given. For example:
For this lab, the reference level was 100cm above ground therefore the height of the object was 10cm. I determined time and ...
