Physics 10 - Lecture 04: Gravity and Satellites II

[death153278]

Hurr durr...

[61miroman]

Pikes peak is almost 13,000 feet. That is a little closer isnt it. Just thinking out loud. But then you would be launching over everybodys heads. But 13,000 feet closer to the 80,000 foot orbit.

[muhammadzahmad]

good lecture...but this video is low quality...

[ymkamara420]

THANK YOU BASED GOD

[ZniLe]

shouldn`t be called "physics for future presidents" but "Physics that everybody should know"

[mugwamp4]

hey guys you're future presidents ya dont need to know shit!! just pass ya law degrees so you can learn to lie with a straight face ..

[GzackOD]

The lecture is good but the video quality is horrible.

[00Avenger17]

why is it called physics for future presidents?

[freyajean]

that would have to be very accurate like:  hyperphysics.phy-astr.gsu.edu/­hbase/acoustic/invsqs.html a

[mspatriciaanne]

Wanted:

Knowledge on long term storage Solar Power Specialist,

Knowledge with Sound Waves Expert, with gravity experience,

Must enjoy a thankless work environment, sometimes hostile.

Must have Computer Science Mathematical Genius ability.

Please Contact

[mspatriciaanne]

Exports around the world would not demand fuels or excess energy costs,

could one not send a solar power vessel in the zero gravity field , then float with GPS the Vessel/Cargo Crate , to any were in the world, and then land the vessel like a little shuttle in China?

My Zero Gravity Theory.

Air Traffic Control , incoming baggage….

Would one be able to send the human in such public transit way?

[mspatriciaanne]

Exports around the world would not demand fuels or excess energy costs,

could one not send a solar power vessel in the zero gravity field , then float with GPS the Vessel/Cargo Crate , to any were in the world, and then land the vessel like a little shuttle in China?

[S3851471]

Great man

[jkolt89]

A++! Great

[AbsolutCamilos]

I hope this help me with my IB physics

[tomte47]

I dont get his argument that rockets become inefficient the faster they go, the fuel is still expelled at the same relative velocity to the rocket and give the same force regardless of the velocity of the rocket ? 

[ghostrider82599]

Just read a book called the kings mirror.

it uses a candle and a sphere to describe

why its hot in Jerusalem and cold in Norway in a time when the earth was though flat.

This king says stuff about gravity that

might be worth considering

[JPO1618]

Well, now we know the Great Question of Life, the Universe and Everything: What velocity must you have (in km/sec) to reach Pluto?

[ravex24]

Wouldn't it make it a little more efficiant if you decreased nozzle diameter the higher your velocity gets with mechanical clamping? That way you can can maintain G's and get to a higher speed faster without crushing the human payload. Or would the pressure get too high and cause the whole thing to blow? I've never taken any classes on physics or anything related but it's something I have been wondering for a while and if anybody could answer that, I would appriciate it.

[sparks444]

thanks for these videos. Ive always been wondering how something can fall without hitting the ground like satellites, now I get it.

[kal1985]

Many thanks to Richard Muller and the filming crew for sharing these educational and highly entertaining lectures; these videos make the internet worth paying for!

[visualkei72]

0:38:17 - Owuh-uh-o-uh-uh-wa

I thought he was gonna start beatboxing. Love these vids.

[eksadiss]

@visualkei72 I didn't notice it until I read this, then it made me lol

[Eniacbc]

@visualkei72 I noticed that too, LOLed xD

[xaznkraziedudex]

great video! hah

[jbwhitmore]

Minutes 47 - 50 ish... The prof says a few things incorrectly. You want the fuel to push off you has hard as it can so that your ship recoils with the fastest possible velocity. It is wrong to say that it is the most efficient to leave the fuel at rest -- if you have the option of the fuel going twice as fast in the opposite direction, you should take it.

[Sogeking32201]

@jbwhitmore I think he's just making the comparison to show how much more efficient it is to eject your fuel while your speed is 8 km/s (shooting from a gun example), so that not only are you already at your escape velocity but you're left with more fuel. Also, when you escape Earth's gravity you will be in a state of inertia with a high velocity, whereas if you launch the fuel in the opposite direction it's 22% less efficient and you're just wasting fuel.

[bigpapanoel]

@Sogeking32201 Actually @jbwhitmore is completely correct. No matter what your relative velocity is, the best possible move is to shoot the most energetic particles possible in the opposite direction you wish to move. The most efficient rocket (largest change in momentum for the smallest change in mass) would be an engine that fires off photons. Everyone needs to imagine the rocket in empty space - this idea of velocity is a relative concept which has no meaning to the voyagers on the rocket.

[blurglide]

Turbo props have the turbine geared to a traditional propeller. Turbofans are what most commercial aircraft have, and the turbine is geared to a ducted fan.

[tinygirl505]

This guy thinks that - in the future - not only will the US still be sending things to space, but the president will be someone who went to Berkeley.

[4jonah]

"Future presidents dont need to know about Newtons. But when they sell it to you in the supermarket...."

mmmmm...Fig Newtons. Ahhhhh

[logihrafn]

this guy is so wrong, what about jesus?

[crazyeyemother]

@logihrafn Jesus was a regular dude. Like you and me.

[logihrafn]

haha excactly - you seem to be the only one who got the joke

[girocraz]

yup you got an A+ for that

[mx5speedracer]

I love these movies. The man is a natural regarding making things easy to understand. But... in fact Bernoulli's principle is what makes planes fly. That's why a B-52 takes off with its wings pointing downwards. You've got to study that subject better, Professor.

Disregarding that, you're by far the best Physics teacher I've had.

[cjholmes2]

He says that Bernoulli's principle IS what makes planes fly. He's just making the point that the typical explanation of pressure differences etc. is misleading because what really causes planes to fly (lift) is the wings redirecting LOTS of air downwards. The Bernoulli principle is simply the method by which they redirect all that air downwards. He's saying that flight/aerodynamics is no different from anything else in the physical world and conservation of momentum is still king.

[jeff2235]

turboprops and jet engines(gas turbines) are not the same.

[forgotmypassword3]

Thank you for making me less dumb

[adepressedlife]

@forgotmypassword3 That's the first step, now have you remembered your password yet?

[criticalthought123]

Even with the statements from below, I have to look at the big picture. Consciousness is there. It drives everything. It makes for unreasonable arguments but it, itself, is rooted in pure reason. We have the choice to love everyone. We have the choice to accept externalized theories to make ourselves feel intelligent, or to gain, from what I perceive to be an artificial sense of peace and well knowing. We have the choice to strive to embrace our consciousness and act on what we think is right.

[criticalthought123]

So, with those first two comments out of the way, I will try and explain.

The idea that consciousness doesn't exist everywhere, and that we aren't bound by a universal consciousness is impossible to imagine for me.

To assume we are the fluke result of a process of physical reactions, is a theory that I can understand and have been at the point of accepting before. But I realize how flawed my thinking was in this respect. Yes the dinosaurs were hit by a meteor. Yes, AIDS, Yes, Infant Deaths

[criticalthought123]

Looking at the big picture scenario. Through my own eyes. In going as far as I can to this point in my existence to remove externalized, unproven theories as facts in my mind. I've come up with some personal conclusions that I have found no reasonable debate for. Furthermore, it becomes scary what some intelligent people accept as factual conceptualizations of things we do not have the capacity to understand. To read "you can't prove a negative". That's unfair to humans and to basic science.

[criticalthought123]

With regards to the "God" debate. I'm going to try and make this as concise as possible.

First, remove the term "God" from your thinking. Remove the need to relate the idea to any Religion, especially those who are as laughable as Creationists. Now, look at the world through your eyes and your eyes alone. If you don't have the time to look deep within yourself and see if there is anything outside of what you previously perceived, then please do not debate this concept with people who have.

[JmSantos78]

@larcyactress You're an idiot or trying to trick the idiots. Anyway, stop it!

[TTTopGun]

If gravity is a feature of matter then why doesn't an ant move through space to orbit around my waist. I don't see astronauts being bombarded with paper clips while on the space station due to their exhibiting gravity.

[psyman88]

have you ever tried that experiment? if you were in a space craft then no, an ant would not orbit your waist, cos the gravity of the surrounding craft and air resistance would be affecting its orbit too much, also the odd shape of a human tould make it more difficult to find the correct velocity for orbit.

if you were nearly spherical, and were away from other souces of gravity and there was no or very little air resistance then i bet you'd be able to make an ant orbit you.

[jamesdmike]

ok fuck i want to not want to use my math to fuck this port math im here me and youre there like two inches people will always try to advaece ecexle advacen but gravity dosent matere when a kil. oh yeah i weighed that and it was a gram you are a fuck that gets paid for a ramble job you could take your thing and liftr it with a cosmic ray. jesu teach somthing original. how about theory in human biengs and the thouhgt that br

[rajus0]

how can u teach something original?? when a syllabus dictates what needs to be taught. also u cant teach new stuff unless its discovered

[phantaros]

when will Americans learn the metric system! This is the 21st century! people! wake up!

[90goldwater]

When the French learn how to fight!

[vanman465]

He is describing a turbofan not a turboprop engine.

[gilc7540]

is there a god? answer honestly

[themachinegunn]

no no no no no

[quarkphotonect]

good answer!!!!!

LOL

[bucketheadkfc]

Nobody can say there is or isnt a God, all we can do is use our best judgement. God is most likely not real, nearly 0% but you cant prove a negative therefore you are always gonna have a hardtime arguing with Creationists. The chance of God being real is about as much as Santa Claus

[ainmire42]

you atheist physicists baffle me. There are universal constants. All things degrade over time, yet you can create equations which perfectly explain the most complex anything and everything. You barely know what the shit light is. Human consciousness comes from the sub-quantum level. Space and matter is in perfect balance and the moon never takes her face away from the earth.

Your answer is the big bang. Other, thinking rational people can answer Creator.

There's more order than chaos; +1 God.

[rajus0]

surely order can only come out of chaos hence where we are now

[evangrogers]

i'm trying to justify your argument "we barely know what the shit light is"... it's an electromagnetic wave generated by the movements of electrons, which they themselves are of wave-particle duality... Light is the movement of a magnetic field really fast back and forth....

Space and matter is in perfect balance? that ... explains... why... the dinosours got hit by a fucking huge meteor...

[8data]

i am sorry, i typed that prematurely, i meant, i just decided to watch Professor muller for no reason whatsoever, and lo and behold, he was suddenly on national public radio with that nice man Jim Flemming, such is the inability to get through life without being used by the same media I believe I control, physicists are great, but i am leaving this country on Presidents Day without being lectured to by this man since I will not be here due to my escape velocity.

[8data]

i am listening to jim flemming with mueller right now and watching this, man, it is a strange world indeed

[8data]

the satellites that just collided could have used this lecture

[flurble33]

Future presidents? Are they training to be president?

[Adkit2]

it's more like: "children of today will grow up and be the presidents of the future, these kids need to be educated and know these things."

it's not LITERALLY for kids who are all trying to become presidents. x.x

[goldensleeves]

QUESTION: If orbital velocity for earth must be 8km/sec and escape velocity is 11km/sec, then what happens when you obtain a velocity of, say, 9.5km/sec (assuming you aimed the rocket with 9.5km/sec in the same direction as you WOULD've aimed it to put it in orbit at 8km/sec)? I mean, it wouldn't be in perfect orbit because it's more than 8km/sec but if it doesn't have enough to escape either. So, would it orbit SOME and THEN EVENTUALLY esape?? Sorry for my amatuer physics & thanks in advance

[Adkit2]

I'm guessing that the 8km/s figure is simply the MINIMUM speed to put something in an orbit. if the object had 9.5km/s for speed it would simply be in a different orbit...? maybe? because it CAN'T escape unless it goes up to 11...uh, right? I think that's right. I could be wrong.

[jepartan]

Adkit, you're right. 8 km/s is the minimum and that would put you into LEO. 9,5 km/s would put you orbiting further away but you wouldn't escape. 11 km/s is the MINIMUM you need to escape.

[goldensleeves]

Oh I see... so if you obtained around 9.5 km/sec velocity you would still orbit but you would simply be orbiting further away than you would have if you had only reached the minimum 8 km/sec. It's funny how simple physics ideas seem so obvious only after you understand it. THanks so much.

[Firehawk2047]

Great question goldensleeves. When a space shuttle has a velocity of 8km/s it has a LEO, and that means it descibes a circle above the telluroids surface (LEO comes from Low Earth Orbit so the telluroid is in this case Earth). When you increase the speed to 9.5hm/s the radius of the circle discribed grows so it will reach a distance fron Earth of more than 200km, untill it reaches a peak.

[sspoke]

its obvious no one listening to this guy its all common sense hes spitting out :P we all just want to see the gun shoot ;P cuz we smart mans only retards wanna learn what he talks.

Gun shot at 37:50

[Darkfoster22]

Jets don't run off fans.Works with heating up air.

[sspoke]

wrong man.. jets work by cutting air.. then shooting the cut air behind you so you go foward like no gravity in space no air u go foward easy with a little thrust.

pls if it was hot air it would go up.. jets need to go left or right not up like a rocket!

[tropdars]

I like how neither of you know how jets work.

[sspoke]

tropdars.. who are you talking to! i know exactly how it works because its pretty much common sense.. the helicopter works nearly the same way.. except it is not shielded in a tube which gives it less thrust.. the area too big i mean..

[tropdars]

Actually the key difference is in how jets compress air, mix it with jet fuel and then ignite the fuel-air mixture. Unless we're talking strictly about turbojets, you don't even need compressor blades. Also in the lecture, he confuses a turboprop with a turbojet, the former actually being a standard propeller that is turned by a gas turbine.

[sspoke]

ohh nice yah.. well those are minor details for improvement I guess.

[Adkit2]

a helicopter wouldn't really work in outer space, would it? a jet would. you know why? of course you don't, because you don't actually know how a jet works like tropdars said. x.x

you also don't seem to know how gravity works. saying there's "no gravity" in space. there's almost as much gravity on a guy in an orbiting spacestation as there is on someone on the surface of the planet.

[sspoke]

there is no gravity once you leave the falling zone of a planet. Gravity is after all a godly force made by our lord GOD.

Think about it.. if gravity was as hard as it suppose to be.. then wouldn't it crush our bodies?... (obviously).

Yes Jet/Heli won't work in space.. Jet pulls AIR in and compresses it and shoots it out at much faster rate.. jeez christ..

[Adkit2]

way to be a troll.

and way to misuse the name of the lord, you're going to hell now...I'd say if I believed in imaginary men.

[SPRMSSVBLCKFOTSEN]

you need mathematics to really excel at physics but its the concepts and models that will really help you in the end as no theory is final as of yet so new ideas should be welcomed and ya consciousness is the perfect tool for seeing the mathematics, im sure feynman would agree, not many of the heavy weights were impressed with his diagrams apparently.

[phatehunter]

unfortunately, I learned this already in Physics 11 IB. I hardly believe this is university physics

[kanuckadisk]

Really? It seems about on par with any first year University course, they all tend to be painfully simple, even more so when they are conceptual courses like this one.

[sn1pe352]

I'm glad he agrees with our current technology being barbaric.

These lectures are so great I have to watch them a second and third time around

Thank you Berkeley and Muller!

[finehops]

Not orbit I mean atmospheric pressure and gravitational pull

[finehops]

What about using anti-gravity tech to break orbit???

[bob8878]

every physical object is effected by gravity

even gas

[musicalaviator]

even light

[bob8878]

photons are massless particles

when light appears to be sucked into a black hole its realy the space it travels through

[Darkfoster22]

anti-gravity is just a name.Its not like the name

[hizand]

Well, it is a good start . Without rigorous maths proof, this should be used for introduction ...

I think, not all the lectures are open to the public :)

[Sebolains]

shame...

I wish there were more advanced lectures available. I already know this subjects. Perhaps in the later videos it advances a little. I guess I'll find out.

[griffrs]

yeah, I think universities usually charge for those. If they put them on the net it would drive down the demand...

[SnarkieM]

I have to stand up for my alma mater and explain things to visitors. With 9 physics Nobel Laureates, and contracts to manage THREE DOE labs--Los Alamos, Livermore and Berkeley--do you really think U California doesn't know how to teach physics?!

Physics 10 IS FOR NON-SCIENCE-MAJOR students. It's physics for psychology and history majors. That's why Dr. Muller writes down high school physics equations, and says "You won't be tested on this."

Read explanatory comments below.

[gabecollett]

thanx

I am a history major

I am embarrassed that I never turned out to be a genius

but understand that it was meant to be to appreciate history

i agree it is too simplistic, but its still fun

[SnarkieM]

Physics H7A-C is Caltech level. Did you get 5s on AP Calculus BC and Physics C, and have a 780+ SAT-? Take this course.

Physics 7A-C is for people who got 4s in Calc BC and Physics C, or 4s in Calc AB and Physics B. SAT 720+.

Physics 8A-B is for life science and architecture students. Pre-meds' favored course. "Baby Calculus" Math 16A or a 3 on AP Calc AB is required. Trig-based HS physics useful.

[teddybeahr]

I really agree that this is not advanced at all. I knew all this and much more (and all the math behind it) when i was 16-17. This is like a course for those who need to repeat the basic concepts for physics before advancing to more difficult courses.

BUT, it's still though very good material. Very well explained by the professor in an entertaining way, and that's what the description says, right?

Very nice uploads, thanks.

[SnarkieM]

Physics 10, known by the video lectures as "Physics for Presidents" is now called Descriptive Introduction to Physics. The previous title was a bit of a jab at President Bush. Physics 10 is for humanities and social science students who have "math and science phobia" who are required to take a science course to graduate.

[leatherman7553]

I am sitting here listning to this having a pint of cherry garcia..... life is good

[mallamace]

Where is the Nuke video? Just curious... I didn't see anything else from this professor.

[bgg0071]

To all the idiot critics. Read the description of the videos....

Physics 10: Physics for Future Presidents. Spring 2006. Professor Richard A. Muller. The most interesting and important topics in physics, STRESSING CONCEPTUAL UNDERSTANDING RATHER THAN MATH, with applications to current events.

[zetreque]

He could have easily related the sneezing to the gun experiment on how humans over react to what is coming on lifting the gun up when firing, or expecting to fall back when firing and ending up pushing too much forward.

[particlenumberfour]

i felt bad for my last commet so i will offer some constructive criticism1. mass is not the determining varible when lifting things into the atmosphere. density determines the forces required(if the density is less the air it will lift itself)2. it does get harder to lift something into space until you pass the final atmosphere(escape velocity)3.you forgot terminal velocity3.rockets are not the only thing we have to get us to space

[alzalacoppa]

I cant't believe that this is the niveau of a so called elite University. Well the elite don't have to work, they just give orders to lower creatures. In german universities the level is much higher! Its not about drawing but about maths and exact theorie.

[MC91335]

Energy that is

[MC91335]

ERROR: F X distance is the Work done not the amount of Eergy expended.

[hastinbe]

All the Physics lessons I have seen so far are excellent. I've successfully annoyed my girlfriend for watching these the past few hours.

[Francuzina88]

HEY DOES ANYBODY KNOW when they are going to upload the 3rd LACTURE: Gravity and Satellites II - 1 ???

[Francuzina88]

THIS COURSE is to provide a general perception of the topic. It doesn't involve deep mathematical analysis and solving problems. That is why all lectures are so interesting. The material is provided straight forward and is very easy to be understood.

[VictorWasechkin]

Great lecture for the University!

But I studied it all in 10th class, middle school, in Russia.

[alzalacoppa]

Is this what you leran in american University?? Where is all the mathematics??

[perspectual]

Another great lecture, Muller explains the concepts exceptionally well using demos that really aids understanding of the scientific concepts easily for anyone who has a basic understanding of the subject matter.