The Periodic Table

Tell me another thing ... whenever I say an object is 10 feet above from the ground ..... what do I actually mean? Do I mean that its centre of gravity is 10 feet above?

M.A.R.

No, that it's 10 feet tall.

ffahim

Oh let me clear ... I meant I lifted up that object to 10 feet above from the ground...

DeNiSkA

@ffahim to be precise, it depends whether you consider the object a point particle or not?

ffahim

@DeNiSkA let's think us not

Let's think its vertically @DeNiSkA

Well I am referring to potential work = mgh .... @M.A.R. @DeNiSkA

M.A.R.

5:29 PM

@ffahim Then the object has a height of 10 feet. That is, it's lowest part is 10 feet above the ground.

That's really semantics, not physics.

DeNiSkA

@ffahim wait! you have to calculate the work done by gravitational force in moving object 10 feet above the ground?

@M.A.R. I remember you were good at english!

M.A.R.

@DeNiSkA I'm not good at English. I'm just not bad.

DeNiSkA

-.-

!beer

!!beer

Chemobot

ffahim

Yeah so when I calculate work done there is h .. in what just h means ? Is it simple height or the distance of the objects centre of gravity to the ground from where it's lifted up? @M.A.R. @DeNiSkA

M.A.R.

5:32 PM

@DeNiSkA If I'm good at English, then what will we call all those profound linguists?

ffahim

Oh come on pls....

M.A.R.

@ffahim It's delta h. How much you have lifted the thing.

DeNiSkA

::*I can smell confusion*::

M.A.R.

@ffahim If you calculate it from the 'center of gravity', it still yields the same result.

ffahim

So if the cover distance wats not pverpendicular ... I meant slightly turned ... then?

DeNiSkA

5:36 PM

then answer will vary

ffahim

Pls let me clear? :-)

Vary... why?

M.A.R.

@ffahim Cos pi/2 = 0

So whatever work has been done parallel to the ground is NOT gravitational work.

ffahim

Hmmm .... then?

DeNiSkA

@ffahim have you studied dot products

M.A.R.

You only should calculate that vertical thingy.

Ugh, I'm not used to physics terminology in English, it seems.

ffahim

5:38 PM

As far as I learned that two dot product of vector is scalar

DeNiSkA

Ok cool then you should know that work done on a body is not just force times displacement, it is force (dot) displacement. And here force is mg and displacement is h

and because dot is there you can't just multiply them

ffahim

Not a big deal at all... I can understand that and that's enough English for me to understand... I am not also fluent in writing or spoken English.. as u have seen before ... @M.A.R. :-)

@DeNiSkA I think I need to learn vector first

Thanks @M.A.R. @DeNiSkA ... both of u guys... :-)

DeNiSkA

bye @ffahim

ffahim

Gd night... sweet dream @DenisKa

DenisKa

nailed fellas on old game :D

M.A.R.

6:09 PM

How to argue with A-holes

Conspiracy theories conspiracy

►

This guy is prolly gonna be added to the list of my YouTube heroes

orthocresol

6:26 PM

@DenisKa lol... you are correct here. you have to consider the object a point particle or else it kinda devolves into semantics.

Anyway, isn't that what high school physics is all about? Point particles, no friction, etc. etc.

Massless rope, frictionless pulley...

DenisKa

yeah! haha @orthocresol

M.A.R.

orthocresol

@M.A.R. Just curious, do you get a message when I edit your chat messages?

M.A.R.

@orthocresol Nope

orthocresol

edits all past messages

M.A.R.

6:29 PM

You're just jealous of my badassnessity. Tongue

orthocresol

I find it a little bit upsetting that the Resources post is only at +5..

invokes mod powers

M.A.R.

@orthocresol You can doez nothing MWAHHAHA

orthocresol

@M.A.R. I could unlock the post and upvote it and lock it again

Ezpz.

M.A.R.

That's just one vote. Pfft.

Akin to nothing.

orthocresol

I could create many new accounts to upvote the same post.

How do you know I haven't already done so on my own answers?

M.A.R.

6:51 PM

@orthocresol You don't got the guts

Health, vaccinations and junk science

►

2 hours later…

Mithoron

8:58 PM

Q: Will supercritical nitrogen stay supercritical if we raise temperature and pressure high above critical values?

Nitrogen's critical temperature is -146.96 °C and critical pressure 33.96 bar. If we maintain nitrogen at 220 bar and 400 °C. What will be the state of N2; will it be still supercritical? I know that phase diagram says after critical temperature and pressure we have supercritical. But no graphs i...