I've been watching these videos for close to 4 years now. I love how you can tell the age of his videos by the resolution of the writing. The newer ones are so much more crisp.
@hybeerian I am a philosophy teacher in a school, and did this so my students could reply to your comment (we have been studying Ryle's 'myth of volitions'). You ask "can the energies of yore [sic] internal self exist in another form such as 'ghost' or spirit?" They have answered that question for you: that there is no such thing as an 'internal self' such as states of mind, they are in fact just ways of behaving, and thus physical like the 'carbon moleicles [sic]' that you recognise exist.
@hybeerian While there may be many different ways to store or to release energy, energy itself is equivalent. The reason that static electricity doesn't kill you is that there isn't enough current (amount of charge passing a given point at any one second) while in an Alternating Current or Direct Current Circuit there can be if there is not enough resistance. This does not mean that the energy itself is any different though. You can also essentially break down all forms of energy into...
The first part is law of Conservation of Energy...... Thermodynamics is about Heat in closed system. ΔU = Q - W could u pls tell more about the heat and adiabatic process.
Adiabatic process is one where heat is neither transfered into or out of the system. Hence Q will be 0. Therefore W will be equal to -U. Now this is equal to -nCv(Ti-Tf). Cv is the specific heat at constant volume (Note - Cv is not only used for isochoric processes as it is thought to be by many. That is a mistake. Cv can be used for adiabatic and isothermal as well) . Now after substituting the expression for Cv. The FINAL eqn for W will be (PiVi-PfVf)/(gamma) - 1. So this just means that if work is done by a gas is positive, volume of the gas will increase and U will be more negative.
This is so amazing...I cannot thank you enough KhanAcademy for all the helpful tutorials...It has expanded my knowledge in Chemistry and reduced my worries :) Thank You.
Well i rather waste my time watching him write than to sit at lecture class staring at the ppt slides that confuse me. He's taking his time to help us students understand things that are unclear to us. Your comment was unnecessary and rude...
Seriously, I wish my professor is like Sal. My professor is seriously terrible at explaining everything; I think he does not understand how a student learns.. Thanks Khan Academy.
Entropy Henry Poincare named the conception of "entropy " as a " surprising abstract " Lev Landau wrote: " A question about the physical basis of the entropy monotonous increasing law remains open " One physicist said : " The entropy is only a shadow of energy“ # History of Entropy 1 - Clausius : dS= dQ / T. 2 - Boltzmann : S= k log W 3 - Planck : h*f = kT logW # The formula of Entropy is : h*f = kT logW Israel Sadovnik Socratus
Good question. The law of conservation of energy is precisely why perpetual motion is "impossible". For motion to be perpetual, there would need to be no negative forces acting on the object in motion. As he discusses in the video, friction is one of these negative forces. So, since the law of conservation of energy states that energy cannot be destroyed, it has to go somewhere, right? Well, in the case of friction, the energy is converted from kinetic energy to heat.
'And then I say no, Mister first law of Thermodynamics' XD 'The way I remember U stands for internal energy? Internal Energy doesn't start with a U!' Hahaha your funny comments in the vids help me to remember the content so much better !
It can absolutely be applied to digestion. Calories are a unit of measure for heat. By determining the caloric intake, taking into account the efficiency of the human body in processing those calories, you can determine, fairly accurately, how much work the body would need to perform in order to "burn" the calories ingested.
@hybeerian Thanks for your reply. My argument is essentially that the information in our brains is not energy. It is the result of patterns in our neural network. I will also stress that there is no such thing as one kind of energy or another kind of energy. All energy is equivalent. The energy inside my computer is exactly the same as the energy inside my head. The only difference is in the arrangement of that energy.
Nice presentation! BUT, isn't that air resistance was always present when you threw the ball up and when the ball was falling down? A constant is present in opposite directions (meaning the factor of air resistance is cancelled out), so that the velocity going up should be the same as when going down.
Personally, the writing helps; I watch videos where people just talk and it is not nearly as helpful as Khan. Plus, it creates the feeling of being in the classroom, which at the very least, gets me in the thinking mode that my house does not normally provide.
@ChirtyPoundsOfBoost Thanks! So the air resistance when the ball is being thrown upwards is much smaller than AR when the ball is moving back to the ground? Therefore, it's not "worth" mentioning the upward resistance?
i have question: A glass cleaned in 45celcius hot water and placed on the table bottom up. The room air at 20 celcius that was trapped in theglass gets heated up to 40 celcius and some of it leaks out so the net resulting pressure inside is 2 kPa above ambient pressure of 101kPa. Now the glass and the air inside cools down to room temperature. what is the pressure inside the glass?
technically energy can be created or destroyed, for example, if matter interacts with the correct amount of positron or "anitimatter", it creates a huge amount of energy.
Does the First Law of Thermodynamics apply to cold and heat energy or does it extend into types of energy like electricity (or even bio-electric -neurons) for example? If anyone can help me with this curiosity please send me a reply. Thank you.
@hybeerian Sorry for the long reply. A shadow is neither matter or energy, yet they clearly exist. Shadows contain information in that they paint a picture of the object blocking them. However, it would be incorrect to say that the information of the shadow exists as "energy". The previous analogy of the paper can be applied to patterns that your neurons make in your brain. I would say that there is information there, but the energy present in the cells is not it.
@hybeerian Cont... potential and kinetic energy. These are different ways of storing energy, but that does not mean that the energy itself is different. "Fusion energy" as you stated, or the energy released by nuclear fusion is released from the mass defect of a nuclear reaction (a little mass is lost and a lot of energy is gained). "Thermal energy" or heat is the transference of kinetic energy from one substance to another. The energy is being stored in different ways, but it is all the same.
@kroflet There is, the ball is trasnferring its kinetic energy into thermal energy when its traveling against gravity as well. He made it seem like the force that accelerated the ball upwards was much greater then when the force of gravity acceled it downwards.
I prefer the step by step actually, sticking on a whole lot of information on the screen can make the student confused and then not know how to follow the information.
And, when the energy is converted from kinetic to heat, the object decelerates. The only way an object could move perpetually would be if the object was in an "ideal" system void of any forces outside of the object's system.
I have a question. Why do you use the capital delta in U = q + w, where q = -w ? Doesn't q and w depend on how you got them? And therefore they aren't situational functions, but path functions? I don't know how you call these functions in english though. In Dutch they're called 'baanfuncties' and 'toestandsfuncties'
@bleedinmagnification it radiates out into the surroundings, doing work to speed up other molecules, perhaps the molecules in the walls of the container...
Possible in Earth because kinetic energy can be use to "defy gravity" in order to gain potential energy. But a giant Wheel bigger than a Ferris Wheel is needed to make it happen. All it needs is the propulsion which will be the ball and a propulsion driver.
Abel Ubina The WORK OUTPUT is more than double the WORK INPUT. So the theory of entropy is misconception. A 15 ball billiard pool to be strike by white mother ball When I computed the work done in pool (billiard) the white mother ball break the 15ball. F = 30lbs (White Mother Ball); D = 3ft (Distance from the white mother ball to the first ball to strike) SOLVE FOR WORK INPUT W = F X D; W = 30lbs x 3ft = 90Ft.lbs SOLVE FOR WORK OUTPUT First two ball extreme corner of the billiard ball 2 out of 15 ball W = F X D; W = 30lbs x 3ft = 90ft.lbs X 2ball = 180 ft. lbs The remaining ball (13pcs ball) can produce more than 90 ft.lbs The computation shows that the output work done is higher than the input work done Appreciated for your reply Thank you. Abel Urbina
When the ball is in motion the mass also changes. E=MCsquare Energy increased so to balance it mass shound increase as C which is speed of light in vacuum is constant.
So it was said that atoms don't really have rotational energy but molecules potentially do bc of sigma bonds that are able to rotate. However, atoms have atomic spin. Doesn't that translate into rotational energy? Was this an accidental omission or do atoms also have rotational energy? Much gratitude for your videos!
![[UA] NAVI vs MOUZ | BO5 | IEM Rio 2024](http://i.ytimg.com/vi/CMBYk0cbGoA/mqdefault.jpg)
He really understands the value of intuition when teaching hard to grasp concepts, that's why his material is the best. Cheers.
First law of thermodynamics- Never talk about thermodynamics.
👎🏻
is that a ******* ****** reference ?
@@iAnesxxdefinitely 😂
U for internal energy. The way I remember that is internal does not start with a U.
+eragon2121 I read this before I got to it in the video and was so confused
eragon2121 sodium starts with S but its NA in chemistry
Black Swan its natrium in most languages
Neither does initial velocity start with u.
You are wrong, it's unternal energy.
I cannot thank you more! You are simply amazing. A gift to the people who are eager to learn!
I've been watching these videos for close to 4 years now. I love how you can tell the age of his videos by the resolution of the writing. The newer ones are so much more crisp.
And your comment was made 6 years ago..
@@wings4994 thanks for the flash back
@just some guy tired of life my friend I’ve had this UA-cam account since 2007
That Is like the first law of everything.
Raj Harsh คััา
worse
Khan, you're the best! Literally life saver for my exam in 3 days.
My exam in 2 days lol
My exam is tomorrow lol
My exam passed LoL.
My exam is today
My exam is an hour away
Dude you are some of the best professors out there you make mine look like a disappointment.
@ aniswar lax 🤣🤣
@hybeerian I am a philosophy teacher in a school, and did this so my students could reply to your comment (we have been studying Ryle's 'myth of volitions'). You ask "can the energies of yore [sic] internal self exist in another form such as 'ghost' or spirit?" They have answered that question for you: that there is no such thing as an 'internal self' such as states of mind, they are in fact just ways of behaving, and thus physical like the 'carbon moleicles [sic]' that you recognise exist.
Be grateful that someone is willing to spend their time teaching you
8:00 internal energy
Thanks .But I have a question.Are we serving as a system or as a surrounding ?
When you realize, that you spent hours surfing the internet looking for this stuff explained, and they were here ALL THE TIME. Great courses.
@hybeerian
While there may be many different ways to store or to release energy, energy itself is equivalent. The reason that static electricity doesn't kill you is that there isn't enough current (amount of charge passing a given point at any one second) while in an Alternating Current or Direct Current Circuit there can be if there is not enough resistance. This does not mean that the energy itself is any different though. You can also essentially break down all forms of energy into...
The first part is law of Conservation of Energy......
Thermodynamics is about Heat in closed system. ΔU = Q - W
could u pls tell more about the heat and adiabatic process.
Adiabatic process is one where heat is neither transfered into or out of the system. Hence Q will be 0. Therefore W will be equal to -U. Now this is equal to -nCv(Ti-Tf). Cv is the specific heat at constant volume (Note - Cv is not only used for isochoric processes as it is thought to be by many. That is a mistake. Cv can be used for adiabatic and isothermal as well) . Now after substituting the expression for Cv. The FINAL eqn for W will be (PiVi-PfVf)/(gamma) - 1.
So this just means that if work is done by a gas is positive, volume of the gas will increase and U will be more negative.
This is so amazing...I cannot thank you enough KhanAcademy for all the helpful tutorials...It has expanded my knowledge in Chemistry and reduced my worries :) Thank You.
My favorite part: "U for internal energy... The way I remember this is because 'Internal' does not begin with 'U' " lol
Khan post too many videos. Coolest people ever
Khan this is very useful ......
Awesome, good practice for remembering for a ME graduated some years ago!!!
Well i rather waste my time watching him write than to sit at lecture class staring at the ppt slides that confuse me. He's taking his time to help us students understand things that are unclear to us. Your comment was unnecessary and rude...
Love you khan academy
very very good guide,
your not boring at all
You are really AWESOME! thanks for being such a great help!!
I understand you better than my lecturer.. thanks so much khan academy
wow this was so easy to understand. If only one of my teachers came close to this.
This is making alot of sense thanks you sal for your spend tim to save me from headaches at night😊
Seriously, I wish my professor is like Sal. My professor is seriously terrible at explaining everything; I think he does not understand how a student learns.. Thanks Khan Academy.
Entropy
Henry Poincare named the conception of "entropy "
as a " surprising abstract "
Lev Landau wrote:
" A question about the physical basis of the
entropy monotonous increasing law remains open "
One physicist said :
" The entropy is only a shadow of energy“
#
History of Entropy
1 - Clausius : dS= dQ / T.
2 - Boltzmann : S= k log W
3 - Planck : h*f = kT logW
#
The formula of Entropy is : h*f = kT logW
Israel Sadovnik Socratus
This is Amazing
Love you sal Khan! You are the best teacher I ever had!
Good question. The law of conservation of energy is precisely why perpetual motion is "impossible". For motion to be perpetual, there would need to be no negative forces acting on the object in motion. As he discusses in the video, friction is one of these negative forces. So, since the law of conservation of energy states that energy cannot be destroyed, it has to go somewhere, right? Well, in the case of friction, the energy is converted from kinetic energy to heat.
I think Sal's favorite word is "intuitive" ;)
Khan Academy helped me so much in my development
In what order should i watch all of the thermodynamics content so i can understand the full concept
wow physics on chemistry! this helps since Im takng physics 1 with chem 2.
7:32 KE was transferred to air particles (rub) = heat
11:49, 12:44 internal energy (U) - "all the energy that is in a system"
'And then I say no, Mister first law of Thermodynamics' XD
'The way I remember U stands for internal energy? Internal Energy doesn't start with a U!'
Hahaha your funny comments in the vids help me to remember the content so much better !
It can absolutely be applied to digestion. Calories are a unit of measure for heat. By determining the caloric intake, taking into account the efficiency of the human body in processing those calories, you can determine, fairly accurately, how much work the body would need to perform in order to "burn" the calories ingested.
this is the coolest video i have ever seen....I love Khan Academy
Thank you so much! Extremely helpful 👌🏻
@hybeerian
Thanks for your reply. My argument is essentially that the information in our brains is not energy. It is the result of patterns in our neural network. I will also stress that there is no such thing as one kind of energy or another kind of energy. All energy is equivalent. The energy inside my computer is exactly the same as the energy inside my head. The only difference is in the arrangement of that energy.
Nice presentation! BUT, isn't that air resistance was always present when you threw the ball up and when the ball was falling down? A constant is present in opposite directions (meaning the factor of air resistance is cancelled out), so that the velocity going up should be the same as when going down.
thanks for this vid! it's really help me in the exams!
Personally, the writing helps; I watch videos where people just talk and it is not nearly as helpful as Khan.
Plus, it creates the feeling of being in the classroom, which at the very least, gets me in the thinking mode that my house does not normally provide.
this was really helpful
does this guy just know everything. no matter what class im struggling with, he's got something up his sleeve lol
@ChirtyPoundsOfBoost Thanks! So the air resistance when the ball is being thrown upwards is much smaller than AR when the ball is moving back to the ground? Therefore, it's not "worth" mentioning the upward resistance?
Thanks,
Very good video and good refresher.....
very clear , well done
i have question: A glass cleaned in 45celcius hot water and placed on the table bottom up. The room air at 20 celcius that was trapped in theglass gets heated up to 40 celcius and some of it leaks out so the net resulting pressure inside is 2 kPa above ambient pressure of 101kPa. Now the glass and the air inside cools down to room temperature. what is the pressure inside the glass?
Incredibly helpfull
thank you!
great video....thank you so much god bless u.
thank you for this interesting video
Thankyou so much sir you are just amazing.
technically energy can be created or destroyed, for example, if matter interacts with the correct amount of positron or "anitimatter", it creates a huge amount of energy.
Thank you for this video,it help me a lot.Greetengs from Serbia
I also liked this one..and also apreciate the person who upload these kind of helpful videos... carry on... God Bless you!!
You're better than my physics lecturers ANY day
very few teachers uses this concrete method,,, talented
Does the First Law of Thermodynamics apply to cold and heat energy or does it extend into types of energy like electricity (or even bio-electric -neurons) for example?
If anyone can help me with this curiosity please send me a reply. Thank you.
He stated that it happens on the way up slightly. You had to listen carefully to hear it.
@hybeerian
Sorry for the long reply. A shadow is neither matter or energy, yet they clearly exist. Shadows contain information in that they paint a picture of the object blocking them. However, it would be incorrect to say that the information of the shadow exists as "energy". The previous analogy of the paper can be applied to patterns that your neurons make in your brain. I would say that there is information there, but the energy present in the cells is not it.
It’s always U = Q + W . The sign conventions of W differs depends whether ur class is chemistry, physics, or engineering.
@hybeerian
Cont... potential and kinetic energy. These are different ways of storing energy, but that does not mean that the energy itself is different. "Fusion energy" as you stated, or the energy released by nuclear fusion is released from the mass defect of a nuclear reaction (a little mass is lost and a lot of energy is gained). "Thermal energy" or heat is the transference of kinetic energy from one substance to another. The energy is being stored in different ways, but it is all the same.
Whats the difference between work done and pressure volume work?
Thanks!
@kroflet There is, the ball is trasnferring its kinetic energy into thermal energy when its traveling against gravity as well. He made it seem like the force that accelerated the ball upwards was much greater then when the force of gravity acceled it downwards.
so there is no air resistance when you throw the ball upwards?
Best explanation ❤!
I prefer the step by step actually, sticking on a whole lot of information on the screen can make the student confused and then not know how to follow the information.
And, when the energy is converted from kinetic to heat, the object decelerates. The only way an object could move perpetually would be if the object was in an "ideal" system void of any forces outside of the object's system.
Thank you khan, you are the man!
very helpful
mind blowing explanation of
U= Q plus or minus W
I have a question. Why do you use the capital delta in U = q + w, where q = -w ?
Doesn't q and w depend on how you got them? And therefore they aren't situational functions, but path functions?
I don't know how you call these functions in english though. In Dutch they're called 'baanfuncties' and 'toestandsfuncties'
Yea. You can watch the videos at 2x the speed like I do! :D It saves so much time when I am watching lectures or learning things on youtube!
wait i have a question wen a gas is released from a container into a room dose it expand?
That's why i like his channel!
@bleedinmagnification it radiates out into the surroundings, doing work to speed up other molecules, perhaps the molecules in the walls of the container...
@kroflet No the air resistance is the same, the density of air in this frame of reference is the same.
this is a very interesting video and very informative!
you are the best teacher
Wouldn't throwing the ball up meet the same amount of air resistance as it would when falling? Thus making the speed of the ball the same both ways?
Thanks 😌
Thanks
Possible in Earth because kinetic energy can be use to "defy gravity" in order to gain potential energy. But a giant Wheel bigger than a Ferris Wheel is needed to make it happen. All it needs is the propulsion which will be the ball and a propulsion driver.
Why is there no air resistance when the ball is being thrown? Moving upwards?
So in the case flash paper, if one burns the paper it just disappear . So what has been done to the energy not destroyed????
Abel Ubina
The WORK OUTPUT is more than double the WORK INPUT. So the theory of entropy is misconception.
A 15 ball billiard pool to be strike by white mother ball
When I computed the work done in pool (billiard) the white mother ball break the 15ball.
F = 30lbs (White Mother Ball); D = 3ft (Distance from the white mother ball to the first ball to strike)
SOLVE FOR WORK INPUT
W = F X D; W = 30lbs x 3ft = 90Ft.lbs
SOLVE FOR WORK OUTPUT
First two ball extreme corner of the billiard ball 2 out of 15 ball
W = F X D; W = 30lbs x 3ft = 90ft.lbs X 2ball = 180 ft. lbs
The remaining ball (13pcs ball) can produce more than 90 ft.lbs
The computation shows that the output work done is higher than the input work done
Appreciated for your reply
Thank you.
Abel Urbina
When the ball is in motion the mass also changes.
E=MCsquare
Energy increased so to balance it mass shound increase as C which is speed of light in vacuum is constant.
? Energy did not "increase".
U might be onto something, my balls increase in size to compensate for the increased energy while jiggling in a horizontal motion.
from where kinetic comes from ?although the participial is at ground state the is no motion.
kinetic energy is due to the motion of particles /mass??
Calculate AU for an endorthemic process in wc 20.6kj flows and where 13.7kj is done on the system
Vary super cool & good topics
What is the significance of 13.375 in physics and the universe? Any insights?
Gracias.
So it was said that atoms don't really have rotational energy but molecules potentially do bc of sigma bonds that are able to rotate. However, atoms have atomic spin. Doesn't that translate into rotational energy? Was this an accidental omission or do atoms also have rotational energy? Much gratitude for your videos!
wow. Its week tw and im still confused but now i understand. Thanks very much
Why didn't the air particals get "heated" on the way up?