When the teacher hums while teaching... u know its gonna be good
@Deadlyaztec27
8 жыл бұрын
I have never learned so much, so quickly. Damn.
@abdullahmohammad5613
7 жыл бұрын
Deadlyaztec27 OMG man you are amazing smart and intelligent professor who proves physics makes since
@andrewedgeller6424
9 жыл бұрын
You sir are a life saver!
@UNEMPLOYEDSENSEI
9 жыл бұрын
Dude's hilarious!
@LeavingCertMaths
10 жыл бұрын
If there is no friction, at least one of the surfaces is perfectly smooth and the record remains stationary even if it is in contact with the rotating turntable.
@mewtwo610
6 жыл бұрын
Daaaaaaang
@AK-gt8zy
9 жыл бұрын
Hahaha you are great I want to be in your class!
@ouukun
7 жыл бұрын
Where is the 1/2 in the inertia coming from?
@robertrenald5663
4 жыл бұрын
For solid cylinder and disc the moment of inertia is 1/2MR²
@carultch
3 жыл бұрын
It comes from Calculus. You add up an infinite number of thin uniform hollow cylinders as your "dm" value (infinitesimal mass element), you add up the moment of inertia (dI) of each one. dI = dm*r^2 dm = rho * 2*pi*r * thickness dr * height h dI = 2*pi*rho*h * r^3 *dr Calculate density rho from the original cylinder's size * mass: m = rho*pi*R^2*h rho = m/(pi*R^2*h) integrate from 0 to R: dI = 2*pi*rho*h * r^3 *dr I = 2*pi*rho*h * [1/4*r^4] from r=0 to r=R I = pi*rho*h/2*R^4 I = pi*(m/(pi*R^2*h))*h/2*R^4 I = 1/2*m*R^2
@JMC50005
6 жыл бұрын
Amazing video, Doc. I watched at 2x speed and I had to pause at 6:19 and go back because it became confusing to think of the record slowing the turntable down so much. I guess I was imagining a record player assembly instead of a turntable part.
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