What is clean: Definition and 72 Discussions

The clean and jerk is a composite of two weightlifting movements, most often performed with a barbell: the clean and the jerk. During the clean, the lifter moves the barbell from the floor to a racked position across the deltoids, without resting fully on the clavicles. During the jerk, the lifter raises the barbell to a stationary position above the head, finishing with straight arms and legs, and the feet in the same plane as the torso and barbell.
Of the several variants of the lift, the most common is the Olympic clean and jerk, which, with the snatch, is included in Olympic weightlifting events.

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  1. pinball1970

    Airbus & CERN Partner to Promote Superconducting Tech for Clean Aviation

    https://www.airbus.com/en/newsroom/press-releases/2022-12-airbus-and-cern-to-partner-on-superconducting-technologies-for "Airbus UpNext, a wholly owned subsidiary of Airbus, and CERN, the European Laboratory for Particle Physics, are launching a project to evaluate how superconductivity can...
  2. S

    Can power supplies/adapters be used to clean up dirty generator power?

    I have a portable generator that I use for backup power at my home in case of a loss of power. I understand that the power from these generators is not clean because both the voltage and frequency are not very stable and this is bad for sensitive electronics and may even damage them. I am...
  3. NTL2009

    How does the "CLEAN" light on a coffeemaker work?

    My Cuisinart drip coffee maker has a light that comes on, telling you to run it through a cleaning cycle (50/50 mix water/vinegar, rinse). In our previous home, we were on a well of about 750 ppm dissolved solids (including some iron), so I had an RO unit connected after the water softener to...
  4. J

    I Why does a Pressure Washer clean better than a Garden Hose?

    In Bernoulli's equation, you have static, dynamic, and hydrostatic pressures equal to a constant. In one sense, I'm wondering if the dynamic part of the equation explains this since -> Pressure = (1/2*rho*velocity^2) and pressure can be expressed as a force / unit area, therefore, an increase in...
  5. E

    Physics What Branch of Physics Deals with Renewable or Clean Energy?

    Hello there, I am interested in renewable or clean or new energy sources. What branch of physics that I need to focus on in order to get a deep understanding on this? Also, what prerequisites do I need? p.s. I am a self taught student, so I don't have any academic advisor
  6. A

    Can clean energy replace fossil fuels?

    If you search the net with the question: "Can clean energy replace fossil fuels?" then no clear answer is given. On the website https://blog.arcadia.com/top-7-questions-youve-asked-google-renewable-energy/ it is said: Yes! However, despite falling costs, wind and solar only produce a little...
  7. lamejane

    PVD Vaccum Chamber -- How to clean up after Water leakage?

    Hello all , our PVD chamber experienced a water leakage from the cruible revoler area and unfortunately we are no longer able to achieve a stable Base pressure ( ~10e-6 mbar) We do not have the option of a bake out. Is there any other way to get rid of water in the chamber ? Ofcourse the water...
  8. L

    How to clean polymaliec acid deposits off the inside of a barrel

    Found a blue water barrel at a thrift store. It is empty, no order but it held belcline 200 aka polymaliec acid. The barrell will be used to hold food scraps, dirt to make compost. How do i clean the barrel? Water? Or should i try and find another barrel Thanks
  9. Philip Koeck

    A Dipoles on a clean surface in vacuum

    Assuming a completely clean and flat solid surface (metal and amorphous carbon as examples). The surrounding vacuum is contaminated with water vapour at very low pressure. In what orientation would the water molecules adsorb to the solid surface?
  10. M

    How to clean lead and tin off silver the smart way?

    Greetings electro chemistry wizards! A quick speculation here... should be easy to sort out whether feasible. I have nice old pocket watch made of sterling silver that some numpty tried to fix with soft solder - lead & tin i presume but god knows when repair was attempted so it could be newer...
  11. S

    Do spiders clean dust from their webs?

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  12. jedishrfu

    Novel Technology to clean the ocean of plastics

    http://www.upworthy.com/a-dutch-boy-genius-said-he-could-get-the-ocean-to-clean-itself-turns-out-he-s-right This young Dutch inventor is set to solve a major ecological problem cleaning the great garbage patch in the ocean between Hawaii and California in a cost effective and possibly...
  13. Seth Newman

    Will the clean energy industry be any different than oil?

    I was reading an article today about how Shell is discussing the move towards "cleaner" energy. This got me thinking. Eventually, most companies will be forced to move towards renewables as public opinion and natural resources become stacked against them. Many large oil and coal conglomerates...
  14. Alisdair

    Automotive Electric cars without clean energy supply....

    Hello all. I'm pretty disorganised and not very clever so I thought I'd ask you all... If you charge an electric car from a power station run on fossil fuel is it cleaner than a petrol car? I'm wondering after looking at the energy loss in converting fossil fuel to electricity and then in...
  15. sevenperforce

    Clean lithium fission saltwater rocket

    Had been talking NSWRs on a spaceflight forum and a thought occurred to me. Lithium-6 fission can be triggered with relatively low-energy neutrons and releases 4.78 MeV, a helium-4 atom, and a tritium atom. Without a neutron flux, however, lithium-6 is completely stable. With a small...
  16. nomadreid

    How clean was the "Tsar bomb"?

    quoting from https://en.wikipedia.org/wiki/Tsar_Bomba about the "tsar bomb": To limit fallout, the third stage and possibly the second stage had a lead tamper instead of a uranium-238 fusion tamper (which greatly amplifies the reaction by fissioning uranium atoms with fast neutrons from the...
  17. T

    Clean way to run 3 phase induction motor

    Say you wanted to run an induction motor from a battery without putting dirty harmonics into it. Would a really clean way to do it, to be by using a higher phase number inverter, then transformer, then into the motor? For instance, a 6 phase inverter, into a 6 phase to 3 phase transformer, then...
  18. Astronuc

    Clean Water Challenges: Solving Drinking Water System Issues

    Drinking water systems imperiled by failing infrastructure http://news.yahoo.com/drinking-water-systems-imperiled-failing-infrastructure-140117243.html So, it appears that the Clean Water Act is not encouraging folks to maintain clean, or cleaner rivers. I don't think bottled water is the...
  19. S

    Stargazing Is there a proper way to clean a telescope mirror?

    Hi guys! I have a Levenhuk telescope and still have a question what is the best way to clean the mirror? Thanx for the help.
  20. T

    How can a Physics major relate to clean energy?

    Hello, I am incredibly interested in Physics, so that is what I am majoring in Physics. However, I also want to do work in clean energy resources. Can I get a job in clean energy with a Physics degree? If so, how?
  21. M

    How Do I Remove Spyware and Prevent Future Infections?

    I have installed a program but a lot of different program has been installed without my permission and most of these strange programs are advertisement programs. And there is a registry cleaning program which has been installed secretly. For example, some links are added by theirselves on the...
  22. Y

    Need suggestion of commercial chemical to clean shower stall

    Hi I have a hard time cleaning the deposit on the floor of the shower stall made of Dupont Corian. I believe it's a combination of hard water ( known to have hard water), soap scum. I tried scrubbing with all different household stuffs including Soft Scrub, Tilex and other common stuffs with...
  23. J

    C/C++ [C++] Any suggestions on how to clean up this procedure?

    Any ideas on how I can clean up the following? void HtmlParser::parseTag(std::string::const_iterator tagBegin, std::string::const_iterator tagEnd, node & thisNode) { /* tagBegin: pointer to the '<' character that starts the tag tagEnd: pointer to the '>' character that ends the tag...
  24. S

    Electromagnetism and Clean Energy

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  25. P

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    So right now I am working on an amature astronomy project to develop a simple lab about the sun's declination. I am borrowing the cheapets linear polarized sheets that I could find ... Because they are least 10 - 15 years old, I would really like to clean them, but I don't know what to use...
  26. D

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    Homework Statement Determine the reaction force from water flowing through a clean 0.02cm (Diamater assumed) hole in tank depth 3m Homework Equations P = rho.g.h A = Pi.R^2 P=F/A The Attempt at a Solution P = rho.g.h = 29400 Pa A = Pi.R^2 = 0.00031415 m^2 P = F/A -> F = PA =...
  27. J

    How to clean cast iron fry pan

    How would be the easiest way to clean a cast iron fry pan that has been heated with water in it that had calcium in the water as now it has calcuim deposited 1/8" thick? John
  28. jim hardy

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  29. Y

    Looking for chemical that can clean hard water stain on glass.

    I have a very hard time cleaning out the hard water stain and soap scum on the shower door glass. I tried the normal cleaning spray. I tried using Vinegar( acetic acid), Lime juice (citric acid) with no luck at all. Any suggestion on what I can try?
  30. H

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    Homework Statement Prove that T1={U subset of X: X\U is finite or is all of X} is a topology. Homework Equations DeMorgan's Laws will be useful. Empty set is defined as finite, and X is an arbitrary infinite set. The Attempt at a Solution 1) X/X = empty set, finite. Thus X is in T1...
  31. Saladsamurai

    Recommendations to Clean Brake Dust from Wheels?

    I'm not talking about caked on or burnt on brake dust due to years of neglect. I'm talking my car has 5000 miles on it and came out from an oil change with greasy brake dust all over my alloy wheels. I am not the type to scrub my wheels all weekend, so I want to nip this in the bud before it...
  32. Monique

    How to clean Indian Shisha embroidery

    I have two authentic Gujarati Indian decorative cloths that need some cleaning. One has oil residue from being located in the kitchen, the other could use a cleaning all-together. I wonder, will I ruin the cloth or the embroidery by cleaning it? Here you can see an example of the elaborate...
  33. P

    A 6oz bottle of olive oil broke in my backpack how should I clean it?

    Is there a good way to remove oil from fabric? My backpack is really oily right now. Luckily nothing inside it was badly soiled, but I'm not sure how to get the oil out of the backpack fibers itself. Thanks!
  34. L

    Leaky alkaline batteries - did I clean up enough?

    Hi everyone, I was cleaning up my computer room/office today, and I found a plastic bag on a shelf with 4 AAAs inside that had white corrosion all over them. I did some Googling and I am guessing the leakage was likely potassium hydroxide. The batteries must have been about 10 years old...
  35. 2

    Mathematica Mathematica always needs a clean start?

    Hi all, I've been using Mathematica through my school for a couple of years, and I finally got my own license so I can work on my homework when I'm not connected to the campus network (we can run Mathematica on our laptops as long as we can remotely hook up to the server they host it on)...
  36. O

    How Does Ultrasonic Cleaning Work?

    Referring to following video, I would like to know how Ultrasonic clean stuffs. Does it transfer sound wave to move the water molecules for cleaning? Does anyone have any suggestions? Thanks in advance for any suggestions
  37. R

    Clean , Quarantine or Delete Option in Anti Malware?

    Anti Malware Delete Quarantine or Clean Option? When a file suspected of being a malware or malware-infected is detected by the Anti-Malware , does the Anti Malware Program normally take the decision itself as to whether this file has to be cleaned , quarantined or deleted straightaway & only...
  38. I

    Tips for Keeping Your Books Clean: Highlighting, Marking, and Note-Taking Habits

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  39. K

    Engineering What major should I pursue for a career in clean energy engineering?

    Hi, I am a junior in high school starting the college process. I want to go into engineering focusing on clean energy. For example, designing windmills or fuel cell engines. My dream job would be working for a company that builds clean energy plants. What major should I pursue? Are there any...
  40. N

    Does Gravity wipe the increase in 'Entropy' slate clean

    I'm just getting into physics and know that the entropy of the universe tends to a maximum. So in the long term stars burn out creating a lot of high entropy. However the left overs of dead stars - the dust and bits of left over radiation then can reform under the influence of gravity to...
  41. Integral

    Is cleaning my coffee carafe necessary for better tasting coffee?

    I have been watching the coffee patina grow inside my carafe for years, it was a rich brown. Yesterday my wife looked inside and claimed to understand why our coffee was tasting muddy. She made me clean it back down to shiny stainless. So the question is, to clean or not to clean?
  42. B

    Likelihood of making a career out of clean energy?

    So, here's the situation: I'm a second-year engineering student at a not-exactly-prestigious school (Wright State University for the morbidly curious), and my current plan is to carry my education all the way through to a Master of Science in Renewable and Clean Energy. Do you really think...
  43. H

    How to show that a transverse intersection is clean, but not conversely?

    How to show that a transverse intersection is clean, but not conversely?
  44. S

    Generating Clean 50% Duty Cycle Square Waves

    Hey all! I'm trying to drive 5 speakers, each at a different preset frequency. I had been using the timer in my microcontroller to drive one, but it would get very messy to drive 5 simultaneously in software using just the 1 available timer. I've decided to drive each with a...
  45. S

    Pipelines: Loss coefficiency on Clean Water VS Slurry

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  46. dlgoff

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  47. M

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  48. mheslep

    X Prize Clean Aviation: $10 million

    An MIT collaboration with the X Prize foundation may soon release a proposal for a fastest coast to coast flight using only electric power. http://web.mit.edu/newsoffice/2009/x-prize-1217.html" I am thinking some of the electric ducted fan technology discussed...
  49. Evo

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    My new computer has been acting flaky since I got it back in July, the motherboard died the other night, The tech is supposed to be here Christmas Eve to replace it. Right now I'm on my old PC that I broke when I knocked it off my desk, all I can say is that you can perform miracles using...