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|dw:1443166269719:dw|

EWWWW I might have this problem on my test!

|dw:1443166523518:dw|\[\sum F_y = ma_{cp} = F_{N} + F_{g} = N + mg=\frac{mv^2}{r}\]

haha, vertical circle
looks like you've fallen in the trap that physics is :)

in the course of a few years parth has learned like 4 times as much physics as me.

why do we need to know the mass :-)

I wasnt there yet haha

anyway the answer is \(h_{min} = 5R/2\)

yeah, Galileo and Neil Armstrong!!

is that tesla in ur dp

yes
if anyone loads up an Edison avatar, there's gonna be blood!!

no this is a dog

lol!

so a naive q, do roller coasters really work like this?
without any chains hooked to the tracks?

Just from the back of my mind, i think Walter Lewin did this in one of the 8.01 lectures on MIT OCW

been a couple years since watching those

they had removed all his lectures from MIT after some controversy

in ideal conditions, they can work like that

:-O, well good thing i dl them all, hehe

hell yes, his lectures and feynman spiked my interest

watching top 5 rolller coaster accidents
https://www.youtube.com/watch?v=mM0HE7DKTvg

https://www.youtube.com/watch?v=HN8nv4tVFuA

maybe a way to do it with just energy conservations

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of course they go faster because here we're calculating the minimum velocity

I just figured out why \(U_f = mg(2r)\) lol... -_-

\(r/2 + 2r = 5r/2\)

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Yah I cant either. That's not eve important. Pfft.

Oh I just realized something

ah gravity doesn't matter

isn't that convenient

@DanJS so if g = 0 ??!!

ganeshie try solving this question about vertical circles... it'd really test your knowledge.

2.5R min height to start

\[h=\frac{5}{2}r \qquad r=\frac{D}{2} = \frac{100}{2} = 50~m\]\[h_{min} =\frac{5}{2}(50) = 125~m \]

Yes PK, post...
today it is going to be a gravity/uniform circular motion day for me!

can I have that extension, ganeshie? you know, the drawing one.

yeah I have a huge collection of questions so no worries

send me meeting id in teamviewer
it would be simpler if i install it

Back to eating my kichadi.

whatever... I found an image that does suit my purpose.

https://www.youtube.com/channel/UCliSRiiRVQuDfgxI_QN_Fmw/playlists
someone uploaded em

@DanJS Im saving this.

download those playlists to disk

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I have a friend attending MIT that's met him.

this thread is really slow for me so can we move to another one?

okiee

http://datagenetics.com/blog/march42014/index.html

oh, never knew it was called a trifecta.

@irishboy123
Where is gravity ever zero in this universe .. infinite range

Well gravity is practically zero at the center of the earth or in free fall :D

\[F \propto \dfrac{mM}{r^2} \]
so the Force is not defined at \(r=0\) right

man i discussed this awhile back, about how you can not have zero distance.. been too long

strong force repulsion or something

Ah, yes. that's true, @ganeshie8

EM repulsion

you can't be sure r=0 by uncertainties in position

nah, inside the earth gravity is pulling you outwards. zero at centre - theoretically

the r assumes a point mass and works outside the sphere that is the earth or any body

And that's why their bone structure slowly decomposes over time - he gravity that acts on them!

microgravity, they are moving very fast and falling around the earth

Yep

like a super cannon that fires so fast the ball falls slower than the horizon curves away

or the same rate

@IrishBoy123 Is the gravity at the center of a uniform Ball zero?

@Jhannybean that's 2 degrees of separation, i think it's called ie w/ Lewin

yes, if you look at it classically.

I don't like playing with words one bit.

but i agree totally that a force that has unlimited reach much reach everywhere :-)

Can we measure the gravitational pull of planets outside of our solar system?

Does that have something to do with a metal sphere and charge concentrated on the surface...

@DanJS but i only know classical physics so if it reaches back on itself .... :p i dunno

the electric field in the center is

isit a conducting sphere?!

it is like, there exists a point between earth and moon where the force would be 0

yes, just recalling barely, i have no numbers , just concepts

@Empty hit nail on head, the inverse square law and the surface area of a sphere ...

basic E&MM concepts?

so you get the same stuff happening. \(\dfrac{stuff}{r^2}\)

@Jhannybean basic to anyone with only 2 degrees of separation from Walter Lewin!

so you can think of earth as all mass distributed around circumference then in that state?

@Empty cracking link!

Is what you're talking about have to do with Poisson's equation @Empty ?

right,

goodnight

It has to do with gravitational fields with results of electrostatics from Maxwell's equation

lol, this all started because i said the universe has gravity throughout..

does gravity "travel" at the speed of light ?!

Yeah

newtonian gravity

+1
Allan Adams is cool

Ha, right!

about 8mins and the lights go out