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Jefferson Lab
United States
Registrace 11. 03. 2008
Jefferson Lab is a Department of Energy facility for exploring the nature of matter. See experiments using liquid nitrogen, learn a new physics term or two, watch full length science lectures, and discover experiments that you can do at home! Thanks for stopping by! Please subscribe and tell your friends!
Let's Make a Scale Model of the Solar System!
Do you have a comically long receipt that you'd like to repurpose? Have you always wanted a model of the solar system that you could fold up and carry in your pocket? If so, this video is for you!
Download the worksheet - education.jlab.org/frost/handouts/solar_system.pdf
Download the stencil's STL file - education.jlab.org/frost/handouts/solar_system_stencil.zip
Download the worksheet - education.jlab.org/frost/handouts/solar_system.pdf
Download the stencil's STL file - education.jlab.org/frost/handouts/solar_system_stencil.zip
zhlédnutí: 816
Video
SULI Student Spotlight - Lourdes
zhlédnutí 17Před 12 hodinami
Every summer, undergraduate students conduct research at Jefferson Lab through the U.S. Department of Energy's SULI program. Let's see what Lacey did this summer! For more information, including how to apply to the SULI program, please visit this site: education.jlab.org/suli/ Other Student Spotlight videos: Summer of 2023 Lourdes - czcams.com/video/UQpmvbYIUSs/video.html Darren - czcams.com/vi...
SULI Student Spotlight - Darren
zhlédnutí 10Před 12 hodinami
Every summer, undergraduate students conduct research at Jefferson Lab through the U.S. Department of Energy's SULI program. Let's see what Lacey did this summer! For more information, including how to apply to the SULI program, please visit this site: education.jlab.org/suli/ Other Student Spotlight videos: Summer of 2023 Lourdes - czcams.com/video/UQpmvbYIUSs/video.html Darren - czcams.com/vi...
SULI Student Spotlight - Dillon
zhlédnutí 5Před 12 hodinami
Every summer, undergraduate students conduct research at Jefferson Lab through the U.S. Department of Energy's SULI program. Let's see what Lacey did this summer! For more information, including how to apply to the SULI program, please visit this site: education.jlab.org/suli/ Other Student Spotlight videos: Summer of 2023 Lourdes - czcams.com/video/UQpmvbYIUSs/video.html Darren - czcams.com/vi...
Here's a Question! - Which Pops First?
zhlédnutí 9KPřed 11 měsíci
Two balloons are inflated by about the same amount. One balloon contains only air. The other balloon contains a little bit of water in addition to the air. Each balloon is placed above a lit candle. Which balloon pops first? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video....
Here's a Question! - Why Does the Water Rise?
zhlédnutí 5KPřed 11 měsíci
When a lit candle that's placed in a shallow tray of water is covered with a beaker, the candle goes out and the water in the beaker goes up. What happens when three candles are used? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Boat on Water - czcams.com/video/M...
Here's a Question! - Dictionary vs. Styrofoam Cup
zhlédnutí 1,3KPřed 11 měsíci
A dictionary and a styrofoam cup are dropped from roughly the same height. The dictionary falls faster than the styrofoam cup. What happens if the cup is placed on top of the dictionary and they're dropped together? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Bo...
Here's a Question! - Can it Roll?
zhlédnutí 2,5KPřed rokem
An empty soda can is placed on its side so that it's free to roll. A plastic pen is given a static charge and is placed close to the can. What happens to the can? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Boat on Water - czcams.com/video/MMQpgfX62bg/video.html...
Here's a Question! - Soaker vs. Jet
zhlédnutí 1,8KPřed rokem
A garden hose has a multi-nozzle attachment. The setting is set to 'soaker', which is kind of like how water comes out of the faucet. The water is turned on, and a beaker is filled. Then, without changing anything else, the nozzle is set to 'jet' and the beaker is filled again. Which setting fills the beaker the fastest? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All...
Here's a Question! - Which Hits the Floor First?
zhlédnutí 1,7KPřed rokem
Two identical basketballs are rolled across a horizontal table. One is rolled slowly, and the other, quickly. Both basketballs reach the end of the table at the same time and fall to the floor. Which one hits the floor first? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video...
Here's a Question! - A Basketball Rolls Off a Table...
zhlédnutí 1,4KPřed rokem
A basketball rolls across a horizontal table. It rolls off the edge and falls to the floor. What path does the basketball take as it falls to the floor? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Boat on Water - czcams.com/video/MMQpgfX62bg/video.html Big Ballo...
Here's a Question! - Make a Magnet?
zhlédnutí 1,8KPřed rokem
An unmagnetized steel rod is swiped along a permanent magnet. What happens to the steel rod? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Boat on Water - czcams.com/video/MMQpgfX62bg/video.html Big Balloon, Small Balloon - czcams.com/video/tKeUs3Gza2I/video.html ...
Here's a Question! - Gas on a Flame
zhlédnutí 1,9KPřed rokem
A small amount of vinegar and baking soda are mixed in a beaker next to a lit candle. Once the reaction settles down, the beaker is tilted a bit as it's held near the candle. What happens to the flame? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/video.html A Boat on Water - ...
Here's a Question! - Mass of Burning Steel Wool
zhlédnutí 4,9KPřed rokem
Steel wool is placed in a beaker. The beaker is placed on a scale and the total mass is measured. Then, the paper is then set on fire. Once the fire burns itself out, the total mass is measured again. How will the masses compare? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n80fOw/v...
Here's a Question! - Mass of Burning Paper
zhlédnutí 3,5KPřed rokem
Strips of paper are placed in a beaker. The beaker is placed on a scale and the total mass is measured. Then, the paper is then set on fire. Once the fire burns itself out, the total mass is measured again. How will the masses compare? Full Playlist: czcams.com/play/PL_1-2OHJMXDC-BXu9gw1GsGNo6ubNYnm1.html All "Here's a Question!" videos: A Basketball Rolls Off a Table - czcams.com/video/BGrB3n8...
Here's a Question! - Circle vs. Triangle
zhlédnutí 1,5KPřed rokem
Here's a Question! - Circle vs. Triangle
Here's a Question! - Steam Filled Can in Ice Water
zhlédnutí 2,4KPřed rokem
Here's a Question! - Steam Filled Can in Ice Water
Here's a Question! - Magnetism and Fire
zhlédnutí 2,7KPřed rokem
Here's a Question! - Magnetism and Fire
Here's a Question! - Water from a Coiled Hose
zhlédnutí 1,8KPřed rokem
Here's a Question! - Water from a Coiled Hose
Here's a Question! - Small Pinhole vs. Large Pinhole
zhlédnutí 2,2KPřed rokem
Here's a Question! - Small Pinhole vs. Large Pinhole
Here's a Question! - Image from Half a Pinhole
zhlédnutí 1,3KPřed rokem
Here's a Question! - Image from Half a Pinhole
Here's a Question! - Image from a Pinhole Camera
zhlédnutí 2,1KPřed rokem
Here's a Question! - Image from a Pinhole Camera
Here's a Question! - Big Balloon, Small Balloon
zhlédnutí 4KPřed rokem
Here's a Question! - Big Balloon, Small Balloon
Here's a Question! - Which Melts First?
zhlédnutí 2,3KPřed rokem
Here's a Question! - Which Melts First?
Here's a Question! - Scales and Static Electricity
zhlédnutí 1,1KPřed rokem
Here's a Question! - Scales and Static Electricity
Here's a Question! - What Shape Does the Sun Trace?
zhlédnutí 1,5KPřed rokem
Here's a Question! - What Shape Does the Sun Trace?
Sat through waiting to see if Pluto is included and was not disappointed. :-]
It always amuses me when someone on social media throws mentos into a bottle of coke (without explaining anything) and the comments are full of "if he was my teacher I'd have won a Nobel medal!" This is science communication right here. One of my favourite lectures on the www.
Rararra..........ra
Scale is mind-boggling at every level. Molecules are mostly "empty" space. Galaxies are farther away from each other than fathomable. Even at our normal level, before we had navigational aids on our devices it was difficult to imagine the scale of a trip to the store versus a trip to a nearby city. If only we could lose this naive notion that we were any good at this sort of thing, we might do better as a society. :)
Interesting!
Most people have no idea of the scale of the sun to the planets and all diagrams in books and graphics show incorrect scaling
Same problem with atoms. If you have a drawing in a book, the only way to make it legible is to get the scale wrong.
Love your videos Sir and Maam. ❤❤
Dang Jo's kid must be 1/16 by now... feel like I'm 42 at this point. When I was looking for liquid nitrogen vids 14 yearrs ago. Fun channel Wish I was 12 years old And had this available. I'm still a sponge Come back and teach the youth They need good friends. And fun teacher's
Thanks for the worksheet! Im going to do it out of nostalgia.
Print the stencil, too, if you can!
I saw one boy and two girl butterflies.
There were four butterflies in the photo...
What if we modify some theory 🤔 and make it happen
Modifying a theory doesn't change reality.
I was super obsessed with this video when i was a little girl :3
Accurate and clear 😂😅
Put a plastic cage around the fixed magnet and put the other pulling magnet right on the outside of the cage. To prevent closing of the magnets and stopping speed. Both magnets cannot be fixed to a single position
Where is the caged magnet? If it's attached to the car, then it's no different than what's shown here when the magnet was attached to the car. If it's external to the car, then it's no different than what's shown here when the magnet was external to the car. I fail to see the benefit of adding a plastic cage.
Please Any one Will Explain in written form? 😢 I am not an english language speaker 😢
Make it make sense
You can't pick yourself up by your bootstraps.
Thankyou
There needs to be a sunlight-powered platform that vibrates to make the magnet float on its own
I still dont get it. How does the car know if the magnet is attached to the car or if its an outside force? 🤔
If it's attached to the car, the car 'feels' the magnet's reaction force (since it's attached). If it isn't attached, the car cannot 'feel' the reaction force.
shame he doesn't touch 200000V in the vid. look at his hair, and he keeps grounding himself. nice vid for kids i suppose but useless for seeing effects of HV electrostatics.
He does touch 200,000 volts (more or less) in the video.
Wow! Great lecture
Iam totally confused
❤
That was a fantastic lecture
He speak so clear ... His articulation is soothe ...to listening especially in the absence of music
Why is it on a string? Can't you just do the example we've all seen on the internet?
Why should we do what you've already seen?
@@JeffersonLab Because I want to know why it won't work. That's why you put up this video.
It doesn't work for the reason we said. All forces (the action and the reaction) are acting on the car. Sit on a bike and push on the handlebars. The bike doesn't move because, even though you are pushing the bike forwards with your hand, some other part of you is pushing backwards on the bike by the same amount. The action and the reaction forces are all acting on the bike. Now, get off the bike and, while standing on the ground, push on the handlebars with your hands. Now, the bike moves because the action force acts on the bike while the reaction force acts on the earth.
@@JeffersonLab I'm a visual learner. I'm sure your words are nice and they're probably true but if I wanted to read about it, I'd read a paper on it elsewhere. I'm here on CZcams to watch and learn because it's a video channel. You're here on CZcams making a "video" about it because the idea is baffling a lot of people and it's a popular scientific inquiry right now. A 10-second video will make more sense to me than 3 minutes of words. I understand your example of pushing the handlebars. My question is would the same be true if I was sitting in a wheelchair and exerted force on the wheels? Of course we've all seen this happen. What if you used a magnet in front of the wheels and steel baffles around the wheel? Will the wheelchair move? Is that the basis of an electric car?
Depends on where the magnet is. If the magnet is supported independently of the wheelchair, then the wheelchair can be made to move, just like what happens to the car in this video. If the magnet is supported by the wheelchair, then the wheelchair will not move, just like what happens to the car in this video.
Re: radiation source Potassium is mildly radioactive as well. I've read that you can use a KCl (potassium chloride) crystal for a radiation source.
Oxygen has a far greater mass than hydrogen, we are made up of water, there for we are mostly made of oxygen
Oxygen by mass. Hydrogen by number. If you have 10 pennies and one quarter, which to you have more of?
appeared in my feed in 2024
The laws of physics cannot be broken but, you can bend and manipulate them! I myself could create a machine arm and program it to be attached to the other end of the car and simulate what you're doing with your hands. And thats only the beginning of manipulating newtons laws. Although there would have to be a battery component. Lol Still, in the future I can see a car using magnetic propulsion with a battery component being charged by a alternator which issssss magnetic. Lol
If the machine arm is attached to the car, then it will work as well as suspending the magnet in front of the car with a stick. If you're going to go through all that trouble, program the machine arm to push against the ground. At least that way, the car will move.
Great video! Just learned something from my son! We found 2x males and 2x females..
What if the magnet was on rails, still attached to the car. When the magnet is turned on it slides forwards. Then turns off and resets position to the beginning. Magnet turns back on and slides forward again. Repeat really fast. Would that work?
No. The most you would get is a relative shift in the position of the car and magnet. The center of mass of the system would remain in one place, so the car would move backwards as the magnet was moved forwards (assuming no friction).
OMG WHEN I WAS A KID I FOUND THAT LITTLE GREE HANGING THING WITH GOLD DOTS AND THOUGHT IT WAS CANDY. LIKE THE BONE HEAD I WAS I DECIDED TO EAT IT. NOW I HAVE WINGS!!!
What horrible audio
Ambient sound.
Magnetic cars could still work.. the road would have to be the opposing Magnet and by adjusting the polarity and strength of the magnet in the vehicle likely using an electro magnet you would be able to adjust direction and speed of travel ..... Applying this would likely cost more money than exists on earth so its not a realistic option... but in another reality if combustion engines were never invented.... maybe it coulda been figured out
That's essentially how maglev trains work. It isn't that you can't propel something with magnetism, it's that you can't to it for free. The 'fishing pole with a magnet' concept doesn't work, but there are lots of ways that do work. It just requires the expenditure of energy.
@@JeffersonLab definitely agreed
u guys aged alot
Beats the alternative.
Phases patterns movement motion, lost now?
So which one is the best shape round or pointed sharp one?
Depends. What are you trying to do?
The amazing wisdom of our Creator!! All things bright and beautiful, all creatures great and small, the Lord God made them all!
So if he slipped and fell on the ground while touching it he would have died?
Only if the floor was hot lava. He stands on the floor while touching the Van de Graaff in this video. He didn't die. Ending up on the floor accidentally isn't materially different than ending up on the floor intentionally. The results would be the same.
What about two vehicles, each with a magnet? Maybe they could be remotely controlled for distance to control speed or tied together with a flexible cable? Hmmmm.
Okay, so you have remote controlled vehicles. How are you making them move? With a motor? If that's the case, then what's the point of the magnets? Remove the magnets and use the vehicles as they are. As far as a flexible cable... Instead of hanging one magnet by a string, as was done in the video, replace the string with a rubber band. That's effectively a flexible cable. Won't make a difference.
I completely appreciate the demonstration for the kids... but is it a positive thing to only teach specific portions? Like, there was zero mention that there isn't enough amperage to kill a person. Or, "this is why birds aren't electrocuted"... no it isn't. Birds aren't electrocuted because wires are insulated. ...still, I DO appreciate the teaching style. Just gotta ask the hard questions because, science b#$ch! Lol! Sik
"Like, there was zero mention that there isn't enough amperage to kill a person." - Yes, there was. It was talked about for nearly a minute, starting around 6:25. For a video that's only about 8 minutes long, that's nearly 12 percent of the time dedicated to this. I don't personally believe that qualifies as 'zero mention'. "Birds aren't electrocuted because wires are insulated" - Transmission wires are not, in general, insulated. The short runs that go to individual houses are insulated, since they are low to the ground, are at a relatively low voltage, and are far more likely to be touched. The rest, though, are not insulated. It just isn't worth the cost to do it. That's why the wires are so high up and so far apart. Air is used as the insulation. Of course, underground transmission wires would need to be insulated, but you don't get too many birds landing on those. (And, the bulk of the transmission wires are aluminum, not copper. Aluminum isn't as good a conductor as copper, but it costs a lot less and it doesn't weigh nearly as much, so you don't need to build as many transmission towers. It doesn't make sense to throw away that weight savings by wrapping each wire in half a foot of rubber.) Glad you enjoyed the video, though!
Really enjoyed this man’s presentation.
great!
Thank you Dr. Murphy. Very interesting and informative I will recommend it to my family and friends.
Awesome
Absolutely 💯 beautiful I think 1x boy an 2 x female butterfly from downunder 🇦🇺✝️❤️
Jealous of the students who got to be taught here !! 🥲🥲
Good video!
1 female & the others are males.
Not quite.
@@JeffersonLab ok, looked again: 2 males, 2 females