Firing a 2 inch Gun at 12,500fps – The Slow Mo Guys


GAV: Hello, I’m Gav.
DAN: I’m Dan. GAV: We’re the Slow Mo Guys. DAN: Gav, I was in the Army for about seven years…
GAV: Yeah, you were Dan. DAN: … which means that I’ve got a lot of experience firing different types of guns….
GAV: Yeah. DAN: … and just before we did the Super-Slow Show, we fired possibly the fattest kind there is. [BANG] DAN: Big .50 cal rifle.
GAV: We shot the mirror right in the face… DAN: We did! DAN: We did. GAV: And the rounds were about this big.
DAN: Yeah, I got a headache from firing it a few too many times. GAV: Well, you’ve clearly read the title. You know this video is the complete opposite. DAN: Bit of a giveaway!
GAV: This is a tiny little pinfire gun, um… GAV: … which technically isn’t a firearm because it’s not rimfire, it’s pinfire.
DAN: Ooooh. GAV: It’s got a little key-ring on it.
DAN: So it– Oh, you can have it as a key ring! GAV: Yeah, you could wear it as a necklace.
DAN: Wow. DAN: So the 50 cal was 12.7 mil, I think…
GAV: Okay. DAN: …and that’s 2 mil.
GAV: Yeah. DAN: Which is a hefty difference.
GAV: It’s wee. DAN: Look, there’s like 20 rounds in here. It’s a tiny little bottle. Look at this little bottle! DAN: Most bullets are bigger than this.
GAV: You know what, we’re not doing a very good size comparison. GAV: We don’t have a standard procedure American quarter. GAV: There you go. Georgie Wash.
DAN: Oh! Nice one! DAN: That’s crazy, isn’t it? I’ve got sweaty hands, so this is gonna be so hard to do. DAN: Slipped in there.
GAV: Slips right in. DAN: No safety, but I’m not gonna cock it yet, I’m just gonna put it there. That’s ready to fire now. DAN: You hit that with anything else, it’d just blow it away. GAV: It would absolutely annihilate it.
DAN: It’d just annihilate it. You’d never see it again. GAV: Right, what do you think you’re aiming for?
I reckon a middle ‘A’. DAN: Middle ‘A’? Okay.
GAV: Yeah. DAN: I’m a bit nervous, because I’ve never missed from this far before. So if I miss… GAV: But when you think about it, when you scale it up, it’s further. DAN: It’s like a 25 meter shot.
GAV: Yeah. DAN: Ready?
GAV: Mmhmm. DAN: Ooh! It’s a hit! I got it!
GAV: You got it? GAV: Ooh, smells nice.
DAN: Ohh, it makes a dent as well. GAV: You didn’t get ‘A’, you got ‘C’. DAN: Are you complaining about me missing? Look at this, right? Look at the sheen on my fingers, yeah? DAN: I have to pull this back, and then I have to like fire this with my nail and my sweaty palms. DAN: It’s like slipping all over the place. It’s a wonder I can even fire the damn thing! DAN: It must mean it’s quite powerful if I hit it at such a low center of gravity and it still knocked the target over. DAN: Woah! Wow! Gosh! GAV: It flattened it.
DAN: That flattened it, cause that’s a ball! GAV: Okay, so let’s go frame by frame and see if we need to go faster. GAV: Seems like it fires a lot of… gunk.
DAN: Yeah, in that tiny little round, it’s like… GAV: Oh, there! There it is, you can see it streak to the front of all those sparks there. DAN: I saw it, it was in the middle of the smoke when it came out, and now it’s overtaken it. GAV: Oh, wow, so it’s still a streak at 12 and a half thousand FPS! (foops!) DAN: Gah… That’s mental!
GAV: That is really fast! GAV: I wonder what the, like, foot-per-second of that thing is. Cause that was a– was that you? You said it was a blur. DAN: You just have to crack the barrel like this, and then in there, in the end, is our spent round. DAN: So we’ve got to get our push rod here, shove it in… DAN: … and it should just push out the old round. There we go. That’s the push rod there. DAN: You see, it’s got all like black carbon around it because it’s been fired, and it doesn’t have a bullet on it there, DAN: whereas these ones… let’s just open our little magazine up… boop! DAN: These ones are clean, and they have little ball bullets on the end. You can see the difference there. DAN: I real– I want one now, as like a little necklace or like a keyring. That’d be so cool! GAV: Yeah, someone walks up to you and goes, “Hey, uh… mate? Do you carry?” DAN: Yeah, I’ve got an open carry license actually. There we go! DAN: We’ve moved further back, there’s a couple of feet here, and I’m gonna try and burst a… DAN: … strawberry… soda… red… sort-of fizzy drink can. GAV: I’ve gone all the way over here because I don’t want to get sticky on the cameras. DAN: Bit harder to hit the target from here actually, as well. Yeah.
GAV: Is it? DAN: OH!! Pfffffft-ah!!! You’re kiddin’ me!! GAV: No way!
DAN: It got me directly in the face! DAN: Oh man! If I hadn’t had these on it’d have got me in the eye ball! GAV: It came out the other side!
DAN: Did it? DAN: I am not getting shot by that thing!
GAV: It went all the way through! DAN: That’s the entrance there.
GAV: Did you go right through the hole in the ‘e’? DAN: Yeah well that’s what I was aiming for, obviously.
GAV: Yeah… GAV: I looked over and it was just– it was spewing out of both sides at once. DAN: Right, this is what I saw, okay? I was here, just like, “oh co– co– ho– fire, come on!” DAN: It, like, after aiming, it fired, and I was surprised that it fired, and then, DAN: because I had my eyes open, all I saw was this– this– I saw in slow motion I swear! DAN: Just strawberries coming straight at my face. I don’t even think it hit the table. It just went, “tssssssst” DAN: straight into my eyes, and on my ears and everything, and I was just like, “Eeeuuggghhh!!!” DAN: Absolutely nailed me! DAN: That’s incredible! I was never expecting it to go through both sides, I thought it would sort of struggle to get through one side. DAN: And this is what I mean, right? It just went straight to me!
GAV: Just straight in your face! DAN: It didn’t even hit the table! It’s not even hitting the table, it just went straight into my face. GAV: That’s so funny!
DAN: Perfect. GAV: You’ve drunk half the can.
DAN: Yeah, I really have. What a way to open a can! DAN: I think it’s the only gun that’s actually comical. It’s funny how small it is, DAN: and it even made a cheeky little exit there, just tore through. I’ve never seen such a small hole! DAN: GAH!! GAV: Knocked it over!
DAN: Jeez! DAN: So you would assume that this is the exit wound, but, if you push it together, DAN: you can actually see that that’s where it went in, and it’s come out of here. DAN: Took off! The entire can took off! GAV: When the pellet comes out the other side, it doesn’t split immediately. There’s actually a few frames where it’s just a hole. DAN: That’s because this is pressurized, so as soon as it like gets weakened, it just goes, “Whoahhhh!” GAV: What are you about to do?
DAN: Shoot a little (Lego?) man in the face. DAN: With this. This to him, is gigantic!
GAV: It’s like an artillery cannon! DAN: Yeah, it’s like an artillery cannon or something. DAN: Okay, ready?
GAV: Yep. DAN: Oh, where’d he go?
GAV: He just vanished! DAN: Where’d he go? Oh here he is! I found him! DAN: Oh his arm went! I took his arm off! I took his arm off. GAV: At this speed, when I rock it backwards and forwards, you can actually see the momentum travel through his body like he’s a full-sized human. DAN: Look, you can see where it’s hit there, and it’s like, knocked his arm off. GAV: He’s got an arm off.
DAN: I’m sorry pal! GAV: So this bloke has survived a Lego plane crash… *traumatic flashback* DAN: Yeah.
GAV: and now you blew his arm off? DAN: I feel sorry for him now, you’ve made me feel guilty about it. There’s no need for that! DAN: OH! I think I got him. I think I knocked his block off. DAN: I shot his hat off! Yeah!
GAV: You shot the hat off a Lego man? DAN: Ohh… wait, what? Ohh…
GAV: I think it hit the front of his hat. GAV: See that dent in his red hat?
DAN: Yeah. That’s an absolute headshot there. GAV: It protected him!
DAN: His earphones are still on as well. GAV: His muffs and his hat protected him. GAV: It actually saved his head! DAN: So found his hat. It’s got a huge dent in it right in the forehead middle part. DAN: To scale that’s probably about a mile his hat flew. DAN: This is an execution… OH!! Ow! DAN: Toong!
GAV: Boing! DAN: Ahhh! Hit my finger!
GAV: It hit you! GAV: Because this is so small, I want to get a shot on a macro lens. GAV: This is a Canon macro lens, and this is a PL mount, so I’m gonna have to do a little bit of… GAV: … open-heart surgery on the Phantom here. GAV: First I should take this lens off. GAV: You tilt it down a little bit, sort of lessens the chance that anything will fall onto the sensor. GAV: Canon mount… GAV: … stick a shim in there… DAN: I like how you’re individually tightening the screws a little bit, because it’s a circle you can’t get away DAN: with just tightening one at a time.
GAV: Yeah, if you put one all the way in then there’s no way this one would go in. GAV: So now… this Phantom fits Canon lenses! GAV: Go look at the end of that! Isn’t that weird? DAN: Blimey! DAN: Nice job!
GAV: A-thank you! DAN: We’re gonna use the clamp just to make sure that, because the macro has such a fine little focus, and I’ve got such fat fingers, DAN: Anytime I fire it, it inevitably moves millimeters left and right, DAN: but because we’re macro that means that that’s a whole world out of focus. DAN: So we’re gonna have to use a clamp here to make sure it just doesn’t move and I’ll just *boop* fire it. DAN: Oh my word! It makes it look huge! DAN: Oooh! GAV: Look at this, it looks so big and heavy. It’s like, “pshooo-pah” DAN: It looks like a huge piece of machinery, doesn’t it?
GAV: Yeah. GAV: Just the fact that the legs sink into the grass, was throwing the whole thing out of focus. I was having to hold it… DAN: I saw you bracing your thumb against this…
GAV: … in 3D space. I was doing this. I was like… GAV: I was controlling the whole thing by extending my finger against the table, like that. DAN: Yeah. Clever!
GAV: So this will be a macro shot right at the barrel. DAN: Firing. DAN: Oooh! DAN: Oh… it’s so quick! You don’t see anything.
GAV: You don’t see anything. GAV: Just for size comparison in that macro shot, I want to see what the coin looks like next to the barrel. GAV: Go for it! DAN: That’s mental! GAV: A good visual comparison there.
DAN: That is really cool. Nice idea! DAN: I like how the foresight is out of focus, but the side of the barrel isn’t. That must be… like a millimeter? DAN: Yeah, a quarter is fatter than the distance between… the foresight and the edge of the barrel, DAN: which is like, about a millimeter probably. So 1mm out, and you’ve completely lost focus. DAN: Is it weird that I had as much fun firing this little thing as I did the 50 cal, just in a different way? GAV: I prefer this because it doesn’t rattle my head.
DAN: Well of course you do! Yeah, to be fair, I have a headache after firing this now. DAN: Yeah, that’s really little– really fun.
GAV: I might though, on the macro shots, take all the sounds from the 50 Cal and put ’em… GAV: *explosions* GAV: I liked that though, just enjoyed the whole of making that video. Was nice and fun, nice and easy. GAV: Aside from the macro, that was a nightmare.
DAN: Surprisingly powerful though. DAN: Have to be careful with these things. They’re not to be messed around with, really. GAV: Well I mean we saw what it did to… the– the can, it had an exit wound. DAN: Exactly. Exactly, yeah.
GAV: You wouldn’t want that in your eye or your… any skin. DAN: No, so just point it away at all times, you’re wearing like safety goggles and all that good stuff. DAN: My trigger discipline was solid today.
GAV: Hopefully you enjoyed that video. GAV: Feel free to follow us on Instagram, subscribe to our YouTube channel, that’s this one. GAV: We’ve also got the other one behind the scenes and all that. Slow Mo Guys 2. GAV: You can bung that a sub as well if you want. It’s just more us… tragically, just… GAV: It’s more of us blokes. We’ll see you in the next video!

When Keeping It Real Goes Wrong – Vernon Franklin – Chappelle’s Show


You’re watching,
When “Keeping it Real” Goes Wrong. Vernon Franklin was
an exceptional young man. He was the valedictorian
of his high school class, won several scholarships, and became the first person
in his family to attend college. He got a good job and worked
14-hour days, 6 days a week, quickly becoming
the youngest vice president in the history
of the Via Corp Corporation, ending the cycle of violence
and drug addiction that had plagued
his family for generations. The officers of his company
were wrapping up the usual Thursday meeting
in the South Conference Room when Frank Murphy,
the man who had mentored Vernon, made an awkward comment. Vernon, great job, buddy. You the man.
Give me some skin, huh? Vernon got along with all
of the people he worked with, which in his heart of hearts
made him feel like an Uncle Tom. Though he could have ignored
the simple comment his mentor made,
Vernon decided to keep it real. Get your motherfucking hand
out of my face. You heard me, motherfucker.
Get your hands outta my face. What you think this is, man?
Just shake my hand like a man. “All right, give me some five
on the backhand side with all this crazy jive.” It’s bullshit.
Want a little soft shoe? Should I juggle some
watermelons for you, boss? Fuck all that, nigger. Hey, Vernon, buddy. Get your motherfucking hands
off me, Frank. This ain’t a game. This isn’t the Vernon I know. Allow me to reintroduce myself.
My name is Hov You never heard that before,
have you? Rap music is dangerous.
I used to beat motherfuckers up just like you just for
walking around my way, nigger. Vernon, Vernon, buddy. You better sit the fuck down,
Frank. Excuse me? I said sit down, bitch.
Thug life. You think this
is a game, nigger? Wu-Tang. Today, Vernon works
at Sonny’s Fill ‘Er Up on Route 80 in New Jersey. He makes $6.45 an hour
and stinks of gasoline, even when he’s not
at the station. It’s as real as it can be. Dollar? What I’m gonna
get with a dollar, nigger? I got kids,
and that’s real. Vernon Franklin, once a heart-
warming story of perseverance. Wu-Tang. Today, a sparkling example
of when keeping it real goes wrong.

Reinhold Würth and his 70th working anniversary


At the company assembly, you talked about jumping out of bed every morning. What has been the source of your enthusiasm and single-mindedness over all these years? Actually, I don’t know either. My wife always says I sleep like a bear. So I would say a good night’s sleep makes you jump out of bed in the morning, wouldn’t you? Us younger people would like to know whether you have a secret
recipe that helps you look as young as you do. Is there any day cream that you can recommend? Well, I use cream on my face every morning: Eucerin. I probably should get a commission from Eucerin now. Prof. Würth, we were told that your place is always full of chocolate
when you are invited to a meeting. Is that true? And what is your favorite kind of chocolate? That is true, but my doctors say sugar is not right for me,
which is why I really had to cut down on chocolate. I must say I don’t really have a favorite kind of chocolate, as long as it’s chocolate. Chocolate is just like beer. Beer is beer, it’s good when it’s cold and wine is wine. We would like to give you the book Nelson Mandela as a gift,
so you are well prepared for the upcoming fall holidays. Thank you very much. I can tell you this book won’t remain unread for long Simply because Nelson Mandela is one of the people I admire the most.
I would even call him a role model. Being imprisoned on an island outside Cape Town
and then turning from a prisoner into a president and seeking no payback, no revenge, but forgiving what has been done to oneself in great human elegance,
I consider that an almost superhuman feat. So this book is really a great gift for me. Thank you very much for that!

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Getting the best mobile phone deal – MoneySmart Rookie


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How to make stress your friend | Kelly McGonigal


I have a confession to make. But first, I want you to make
a little confession to me. In the past year,
I want you to just raise your hand if you’ve experienced
relatively little stress. Anyone? How about a moderate amount of stress? Who has experienced a lot of stress? Yeah. Me too. But that is not my confession. My confession is this: I am a health psychologist, and my mission is to help people
be happier and healthier. But I fear that something
I’ve been teaching for the last 10 years
is doing more harm than good, and it has to do with stress. For years I’ve been telling people,
stress makes you sick. It increases the risk of everything
from the common cold to cardiovascular disease. Basically, I’ve turned stress
into the enemy. But I have changed my mind about stress, and today, I want to change yours. Let me start with the study
that made me rethink my whole approach to stress. This study tracked 30,000 adults
in the United States for eight years, and they started by asking people, “How much stress have you
experienced in the last year?” They also asked, “Do you believe that stress
is harmful for your health?” And then they used public death records
to find out who died. (Laughter) Okay. Some bad news first. People who experienced a lot of stress
in the previous year had a 43 percent increased risk of dying. But that was only true for the people who also believed that stress
is harmful for your health. (Laughter) People who experienced a lot of stress but did not view stress as harmful were no more likely to die. In fact, they had the lowest risk of dying of anyone in the study, including people
who had relatively little stress. Now the researchers estimated
that over the eight years they were tracking deaths, 182,000 Americans died prematurely, not from stress, but from the belief
that stress is bad for you. (Laughter) That is over 20,000 deaths a year. Now, if that estimate is correct, that would make
believing stress is bad for you the 15th largest cause of death
in the United States last year, killing more people than skin cancer,
HIV/AIDS and homicide. (Laughter) You can see why this study freaked me out. Here I’ve been spending
so much energy telling people stress is bad for your health. So this study got me wondering: Can changing how you think
about stress make you healthier? And here the science says yes. When you change your mind about stress, you can change
your body’s response to stress. Now to explain how this works, I want you all to pretend
that you are participants in a study designed to stress you out. It’s called the social stress test. You come into the laboratory, and you’re told you have to give a five-minute impromptu speech
on your personal weaknesses to a panel of expert evaluators
sitting right in front of you, and to make sure you feel the pressure, there are bright lights
and a camera in your face, kind of like this. (Laughter) And the evaluators have been trained to give you discouraging,
non-verbal feedback, like this. (Exhales) (Laughter) Now that you’re sufficiently demoralized, time for part two: a math test. And unbeknownst to you, the experimenter has been trained
to harass you during it. Now we’re going to all do this together. It’s going to be fun. For me. Okay. (Laughter) I want you all to count backwards from 996 in increments of seven. You’re going to do this out loud, as fast as you can, starting with 996. Go! (Audience counting) Go faster. Faster please. You’re going too slow. (Audience counting) Stop. Stop, stop, stop. That guy made a mistake. We are going to have to start
all over again. (Laughter) You’re not very good at this, are you? Okay, so you get the idea. If you were actually in this study, you’d probably be a little stressed out. Your heart might be pounding, you might be breathing faster,
maybe breaking out into a sweat. And normally, we interpret
these physical changes as anxiety or signs that we aren’t coping
very well with the pressure. But what if you viewed them instead as signs that your body was energized, was preparing you to meet this challenge? Now that is exactly
what participants were told in a study conducted
at Harvard University. Before they went
through the social stress test, they were taught to rethink
their stress response as helpful. That pounding heart
is preparing you for action. If you’re breathing faster,
it’s no problem. It’s getting more oxygen to your brain. And participants who learned to view
the stress response as helpful for their performance, well, they were less stressed out,
less anxious, more confident, but the most fascinating finding to me was how their physical
stress response changed. Now, in a typical stress response, your heart rate goes up, and your blood vessels
constrict like this. And this is one of the reasons
that chronic stress is sometimes associated
with cardiovascular disease. It’s not really healthy to be
in this state all the time. But in the study, when participants viewed
their stress response as helpful, their blood vessels
stayed relaxed like this. Their heart was still pounding, but this is a much healthier
cardiovascular profile. It actually looks a lot like what happens in moments of joy and courage. Over a lifetime of stressful experiences, this one biological change could be the difference between a stress-induced
heart attack at age 50 and living well into your 90s. And this is really what the new
science of stress reveals, that how you think about stress matters. So my goal as a health
psychologist has changed. I no longer want
to get rid of your stress. I want to make you better at stress. And we just did a little intervention. If you raised your hand and said you’d had a lot of stress
in the last year, we could have saved your life, because hopefully the next time
your heart is pounding from stress, you’re going to remember this talk and you’re going to think to yourself, this is my body helping me
rise to this challenge. And when you view stress in that way, your body believes you, and your stress response
becomes healthier. Now I said I have over a decade
of demonizing stress to redeem myself from, so we are going to do
one more intervention. I want to tell you about one of the most under-appreciated
aspects of the stress response, and the idea is this: Stress makes you social. To understand this side of stress, we need to talk about a hormone, oxytocin, and I know oxytocin has already gotten
as much hype as a hormone can get. It even has its own cute nickname,
the cuddle hormone, because it’s released
when you hug someone. But this is a very small part
of what oxytocin is involved in. Oxytocin is a neuro-hormone. It fine-tunes
your brain’s social instincts. It primes you to do things that strengthen close relationships. Oxytocin makes you crave physical contact
with your friends and family. It enhances your empathy. It even makes you more willing
to help and support the people you care about. Some people have even suggested
we should snort oxytocin… to become more compassionate and caring. But here’s what most people
don’t understand about oxytocin. It’s a stress hormone. Your pituitary gland pumps this stuff out as part of the stress response. It’s as much a part
of your stress response as the adrenaline that makes
your heart pound. And when oxytocin is released
in the stress response, it is motivating you to seek support. Your biological stress response is nudging you to tell
someone how you feel, instead of bottling it up. Your stress response wants
to make sure you notice when someone else
in your life is struggling so that you can support each other. When life is difficult, your stress response wants you
to be surrounded by people who care about you. Okay, so how is knowing this side
of stress going to make you healthier? Well, oxytocin doesn’t only act
on your brain. It also acts on your body, and one of its main roles in your body is to protect your cardiovascular system
from the effects of stress. It’s a natural anti-inflammatory. It also helps your blood vessels
stay relaxed during stress. But my favorite effect on the body
is actually on the heart. Your heart has receptors for this hormone, and oxytocin helps heart cells regenerate and heal from any stress-induced damage. This stress hormone
strengthens your heart. And the cool thing
is that all of these physical benefits of oxytocin are enhanced
by social contact and social support. So when you reach out
to others under stress, either to seek support
or to help someone else, you release more of this hormone, your stress response becomes healthier, and you actually recover
faster from stress. I find this amazing, that your stress response
has a built-in mechanism for stress resilience, and that mechanism is human connection. I want to finish by telling you
about one more study. And listen up, because this study
could also save a life. This study tracked about 1,000 adults
in the United States, and they ranged in age from 34 to 93, and they started the study by asking, “How much stress have you
experienced in the last year?” They also asked, “How much time have you spent
helping out friends, neighbors, people in your community?” And then they used public records
for the next five years to find out who died. Okay, so the bad news first: For every major stressful life experience, like financial difficulties
or family crisis, that increased the risk
of dying by 30 percent. But — and I hope you
are expecting a “but” by now — but that wasn’t true for everyone. People who spent time caring for others showed absolutely no stress-related
increase in dying. Zero. Caring created resilience. And so we see once again that the harmful effects
of stress on your health are not inevitable. How you think and how you act can transform your experience of stress. When you choose to view
your stress response as helpful, you create the biology of courage. And when you choose to connect
with others under stress, you can create resilience. Now I wouldn’t necessarily ask
for more stressful experiences in my life, but this science has given me
a whole new appreciation for stress. Stress gives us access to our hearts. The compassionate heart
that finds joy and meaning in connecting with others, and yes, your pounding physical heart, working so hard to give you
strength and energy. And when you choose to view
stress in this way, you’re not just getting better at stress, you’re actually making
a pretty profound statement. You’re saying that you can trust yourself
to handle life’s challenges. And you’re remembering
that you don’t have to face them alone. Thank you. (Applause) Chris Anderson: This is kind
of amazing, what you’re telling us. It seems amazing to me
that a belief about stress can make so much difference
to someone’s life expectancy. How would that extend to advice, like, if someone is making
a lifestyle choice between, say, a stressful job
and a non-stressful job, does it matter which way they go? It’s equally wise to go
for the stressful job so long as you believe
that you can handle it, in some sense? KM: Yeah, and one thing
we know for certain is that chasing meaning
is better for your health than trying to avoid discomfort. And so I would say that’s really
the best way to make decisions, is go after what it is
that creates meaning in your life and then trust yourself to handle
the stress that follows. CA: Thank you so much, Kelly.
It’s pretty cool. (Applause)

How does an Electric Car work ? | Tesla Model S


Electric cars are making big waves in the automobile world These noise-free, pollution-fre and high-performance] vehicles are expected to make their IC engine counterparts obsolete by 2025 This video will unveil the hidden technologies behind the Tesla model S which recently became the world’s fastest accelerating car We will see how electric cars have achieved superior performance by analyzing the technology behind the induction motor, inverter Lithium-Ion battery Power source, and, above all, the synchronized vehicle mechanism, in a logical step-by-step Manner The powerhouse of the tesla car is an invention made by the great scientist Nikola Tesla around 100 Years back: the induction motor The induction Motor has two main parts: the stator and the rotor You can see the construction details of the motor here The rotor is simply a collection of conducting bars short-circuited by end rings A three-phase AC power input is given to the stator The three-phase alternating current in the coils produces a rotating magnetic field. The tesla motor produces a four-pole Magnetic field. This rotating magnetic field that induces current on the rotor bars to make it turn In an induction motor the rotor always lags behind the RMF. An induction motor has neither brushes nor a permanent magnet. At the same time it is robust and powerful. The beauty of an induction motor is that its speed depends on the frequency of the AC power supply. So just by varying the frequency of the power supply, we will be able to alter the drive wheel speed This simple fact makes electric car speed control easy and reliable The motor Supply is from a variable frequency drive, which in turn controls motor speed. The motor speed can range from Zero to 18,000 rpm. This is the most sizable advantage electric cars have when compared to internal combustion cars. An Internal Combustion engine produces usable torque and power output only within limited speed range Therefore, directly connecting the engine rotation to the drive wheel is not a clever idea. A transmission must be introduced to vary the drive wheel speed On the other hand an induction motor will work efficiently in any speed range Thus no speed varying transmission is needed for an electric car moreover an IC engine does not produce direct rotational motion The linear motion of the piston has to be converted to rotational motion This causes major problems for mechanical balancing Not only is the internal combustion engine not self-started like an induction motor further, the power output of an IC engine is always uneven Many accessories are needed to solve these issues On the other hand you will have direct rotational motion and uniform power output with an induction motor many components in the IC engine can be avoided here As a result of these factors, a great response rate and higher power to weight ratio comes naturally to an induction motor resulting in superior vehicle Performance But from where does the motor receive power? From a battery pack the battery Produces DC power so before supply get to a motor it has to be converted to AC An inverter is used for this purpose This power electronic device also controls the Ac power frequency thus controlling the motor speed Moreover the Inverter can even vary the amplitude of the ac power which in turn will control the motor power output Thus the inverter acts as the brain of the electric car Now let’s turn our focus to the battery pack You will be amazed to find that they are just a collection of common lithium-ion cells similar to those used in your daily life The cells are connected in a combination of series and parallel to produce the power required to run your electric car Glycol coolant is passed through metallic inner tubes through the gap between the cells This is one principal innovation of Tesla by using many small cells instead of a few big cells Effective cooling is guaranteed This minimizes thermal hot spots and even temperature distribution is achieved leading to higher battery pack life The cells are arranged as detachable modules There are 16 such modules in the battery pack constituting around 7,000 cells The heated Glycol is cooled down by passing through a radiator, which is fitted at the front of the vehicle Moreover you can see how such a low height battery pack when fitted close to the ground level will lower the vehicle center of gravity The lower of gravity improves the stability of the car considerably The large battery pack is also spread across the floor offering structural rigidity against side collisions Now let’s get back to Tesla’s drivetrain The power produced by the motor is transferred to the drive wheels via a gearbox As previously discussed, tesla model s uses a simple Single speed transmission because the motor is efficient in a wide range of operating conditions You can see that output speed from the motor is reduced in two steps Even achieving the reverse gear is quite easy in an electric car. Just change the order of the power phase for this The only purpose of electric car transmission is speed reduction and associated torque multiplication The second component in the Gearbox is a differential The reduced speed drive is passed to it You can see this is a simple open differential. However, open differentials, have a problem of traction control But why does such an advanced car use an open differential rather than a limited slip differential? The answer is that the open differential is more rugged and can carry more torque A problem that occurs in an open differential can effectively be overcome with help of two methods:
selective braking and cutting the power supply In an Internal combustion engine this power supply cut by cutting the fuel is not so responsive In an induction motor, however, the power supply cut is quite responsive and an effective means for obtaining traction control In the tesla this can all be accomplished using a state-of-the-art algorithm with help from Sensors and controllers In short, Tesla Motors has replaced a complex mechanical hardware system with smart, responsive software Did you know an electric car could be driven efficiently with the help of just one pedal? This is due to its powerful regenerative braking system That means saving the huge kinetic energy of the car in the form of electricity without wasting it as heat In an electric car, as soon as you release the accelerator pedal the regenerative braking comes into action The interesting thing is that during the regenerative braking the same induction motor acts as a generator Here the wheels drive the rotor of the induction motor We know in an induction motor the rotor speed is less than the RMF speed To convert the motor to a generator. You just have to make sure that the rotor speed is greater than the RMF speed The inverter plays a crucial role here in adjusting the input power frequency and keeping the RMF speed below the rotor speed This will generate electricity in the stator coils, which is way higher than the supplied electricity The generated electricity can then be stored in the battery pack after the conversion An opposing electromagnetic force acts on the rotor during this process, so the drive wheels and the car will slow down This way vehicle speed can be accurately controlled during the drive using a single pedal The brake Pedal can be applied for a complete stop As you might already be aware, electric cars are much safer than internal combustion cars The cost of maintaining and driving an electric car is much lower than that of an IC engine car With the drawbacks of the electric car evaded through the advent of improved technology, electric cars promise to be the cars of the future We think mr.. J. Who Garcia an electric car expert and youtuber for his technical support for this video? Your support at patreon.com is highly appreciated. It enables us to make additional free educational videos for you. Thank you

North Korea-U.S. working-level talks resume in Stockholm Saturday


it’s late Saturday morning over in
Sweden where North Korea and the US have just started their working-level
discussions although details are sketchy our eg1 tells us what we can expect from
the talks North Korea and the u.s. agreed to resume their working-level
talks on Saturday at the villa a fixture and inland Ingo northeast of Stockholm
details are not yet known about the meeting but that is what’s been
reportedly agreed by the two sides at their preliminary discussions today
before it is known that the US special envoy for North Korea mark Lambert and
Kwon jungin the former head of the regime’s North American Affairs
Department carried out Friday’s exchange as the discussion was in preparation for
Saturday’s meeting the two sides only met for a few hours Friday morning to
reportedly work out the schedule and administrative tasks for the actual
working-level sit down regarding general atmosphere it’s been
reported that the US thinks proactive talks were exchanged in an amicable way
while not much is known about saturday’s talks ji myung-gil will be heading the
North Korean delegation while US Special Representative for North Korea Stephen
vegan will do so for Washington there was speculation that the talks could go
on for more than a day should there be more to discuss but there are no
indications of that happening as of yet this is the first time that the two
sides have sat down on the negotiating table since the annoy summit fell apart
in February with President Donald Trump recently having mentioned the possible
new calculation eyes are on whether the two sides can agree on the
denuclearization steps and their corresponding measures first the main
sticking point of Saturday’s meeting is expected to be whether North Korea will
give up anything more than the young banned nuclear facility and whether the
US will give partial sanctions relief or security guarantees in exchange
Time magazine citing two US officials said Trump is prepared to offer Kim
jong-un a three-year waiver from UN sanctions on textile and coal exports
should Pyongyang agreed to dismantle its main nuclear facility at Young Gun and
hold its production of highly enriched uranium easy one
yes

4-H Working Safely on Tractors


Tractors play an important role on most farms,
and proper training and use of farm equipment is essential in keeping everyone healthy and safe. Working Safely on Tractors So who can or can’t use a tractor? Well, no one is allowed to drive a tractor unless they’re under strict supervision, or are cleared by a knowledgeable and experienced supervisor. You may have been around tractors your whole life, but that doesn’t mean you’re trained to use them. The first thing you need to do is read and follow the manual. Always use the steps or ladder to climb on. Face the machine while you climb, and keep three points of contact at all times. If the machine doesn’t have a stepper ladder, use the left side — that’s the one with the clutch. Using the right side is dangerous
because you could release the brake. Never jump or try to get on or off a moving tractor. That’s just super dangerous. So now let’s talk about a few driving hazards. The biggest driving hazard can be the terrain, so always look out for things such as stumps, large stones, irrigation pipes, ditches, mud, and large holes. And if you can’t remove a hazard, mark or flag it so you or someone else will see it next time. Hills and uneven surfaces are another huge hazard when it comes to operating tractors. It’s always best to drive straight up or down a slope — never on an angle. And avoid sharp downhill turns. Always slow down before making turns, and begin to apply the brakes before you turn the wheels.
And don’t speed. Another important safety feature of your tractor is the ROPS. She means the rollover protective structure. If the machine you’re using doesn’t have one, ask if you should be using that tractor. ROPS are mandatory in most situations and must be used with a seat belt. The idea is if the tractor were to roll or flip, the ROPS would keep the tractor from rolling on top of you. But you have to wear your seat belt
so you stay in your seat and protected. It’s like a roll bar in a race car. When operating a tractor with a bucket,
always travel with the bucket low. This will keep your centre of gravity low
and the tractor stable. If you’re towing an offset implement,
the implement should always be on the uphill side. Also, avoid sharp downhill turns. Never ride on a tractor if there isn’t a seat — no matter who tells you to — and don’t let anyone else do it either. It’s extremely dangerous. Tractors can also be crazy loud. You have to
remember to wear your hearing protection. If you’re 16 or older, and you have your driver’s licence, then you’re allowed on roads. If not, you can’t go on roads, so don’t. So that’s it. Now you’ve heard about a few of the hazards of operating a tractor. Proper training and use of farming equipment
is absolutely essential in keeping everyone
healthy and safe. Remember all these things and you’ll be well on your way to working safely on and around tractors. Thanks for watching. And if you have any questions, ask your 4-H leader.

AF8 – Business Resilience


The impact of the 2011
earthquake on this company of me personally was pretty profound.
We had loss of a loved one and the business itself was pretty dramatically
impacted. We lost a lot of infrastructure, lost a lot of staff, we lost customers.
What we found was a business that was severely severely damaged in terms of
its people, in terms its machinery, in terms of the building. I had staff members saying ‘sorry Tom the business is gone but at least everyone got out alive’.
That’s what I was faced with and it might sound melodramatic now but that
was what we were looking at – everything was on the floor and
everything was damaged. The overarching decision for me was that I had 150
families relying on me to keep this business going. So if I go, there’s 150
families and suddenly now got an earthquake and no income and so I felt
personally quite responsible for the fact I had to give it my very best shot
to keep the business going. My name’s Tom Thompson and this is my company, EPL. We are a plastics profile company so we supply most of the appliance industry,
the marine industry, dairy industry, construction. The mindset that someone faces in that situation is you’ve got to be flexible and you’ve got to be fleet of
foot. I think it was it was a matter of hours between grabbing the resources
that were already being gobbled up and being able to utilize those resources
and rebuild the business. We’re talking hours, not days or weeks. So with the new building we’ve bought
our infrastructure back above ground that’s your power, your water, your high-pressure air and that type of thing is all above-ground so if anything goes
wrong we can fix it easil y. After the earthquake building codes have changed
quite rightly and we’ve made sure stayed that the front edge as we
built this building. To prepare for the Alpine Fault you need to be adaptable
and you need to be able to take people with you. I just think you need to be
aware of the type of things that can go wrong, you have to try all the time to
see how you can make the business more resilient and that may that might change
as time goes on but you do have to be fleet of foot and you do have to use
your resources because not everyone’s going to be effective. The bigger the event the bigger the fact that you will be relying on yourself to
a large extent.