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12:00 AM
hey, @hhh
you there?
 
hhh
Yes.
 
could you help me with some basic force v position thing?
I don't understand the graph
 
hhh
post it here, I will check it later -- reading for an exam in 7 hours and going to sleep soon.
 
okay...
thats the image
hey chris
can someone explain how to get those things?
I mean I have the answers, but don't know why
can you explain the theory behind it?
 
hhh
It is accelerating: the distance moved is $d=vt+\frac{1}{2}at^2$ where $d$ is on the $x$ axis and acceleration from $F=ma$ where $F$ is on y-axis. It starts from rest so $v(0)=0$. The area under the curve is the work with respect to x-axis.
 
12:10 AM
but how do you know it's acelrating?
 
hhh
Because there is a force on y-axis.
 
okay
 
hhh
$\sum F_x$
 
i don't get it :p
 
hhh
and by Newton $F=ma$
$\sum$ means just summation
 
12:11 AM
I know that
but I just don't get why it's accelerating because there is a force on the y axis
 
hhh
Let say the box lies on table. The net force is 0 at start i.e. $\sum F_x=0$ -- so not accelerating, right?
 
yup
oh
i get it
but sinces it's 1 it accelrates!
 
hhh
Move one unit right and you have case $\sum F_x=1$ and by Newtow's law, $F=ma$ so $a=\frac{F}{m}$ where $F=\sum F_x=1$ and $m\not =0$ so $a\not = 0$ so acceleration.
Great, not hard. Consider one step at time :)
 
yay
okay next question
why is the work .75J?
 
hhh
Work is the area i.e. $W=Fd$ where $d$ is the distance travelled and $F$ is the force.
 
12:15 AM
shouldn't it be 6.75 if area is work?
 
hhh
$W=\int F dx$ which in discreate form is the same as $W=\sum_x F d_x$.
 
huh?
oh
can you exaplain it in laymans terms?
i don't really get calc that much
still studying it
 
hhh
It is basically just the area: if you can calculate the area 1 times 1 is one square so work 1.
 
wait, what?
 
hhh
If you move 1kg box from point 0 to point 10, how much work have you done?
10*1=10 unit of work, right?
 
12:18 AM
uh, 10J?
yup
 
hhh
yes
 
but still why is .75?
if I count the boxes, it should add up to 6.75..
 
hhh
1B?
 
yea
 
hhh
7.5 boxes uder the graph from 0 to 5
 
12:27 AM
okay
but why does that make it .75???
oh nvm
I'm sorry, it is 7.5
okay, onto 1c, how do you get max position?
 
hhh
Trick quesiton -- infinite on the x-axis?
No, the box will stop at some spot -- it is impossible to tell. We cannot see when it stops.
It could start moving backwards with negative force.
But now this was the last one: I need to read for my exam. Post your question to the main site as simple as possible -- people will surely try to help.
 
okay
thanks
really apprecaite it
good luck on your exam
 
hhh
no question is too stupid, just ask questions -- best way to learn...

Thank you :)
 
 
1 hour later…
1:38 AM
Manishearth has been automatically appointed as owner of this room. (What does this mean?)
 
hehe, @Manishearth I guess the computer has big plans for you
 
user54412
1:53 AM
lol
 
hhh
2:49 AM
I am stuck with parametrization of a square to calculate electric field from the change of magnetic field. Could some preview this question here?
I am not sure whether there was some physical rule by which I can do an arbitary parametrization just along a closed loop.
in which I contain the original area -- if I could do it -- I could change the hard integral into polar form and then solve it
 
 
2 hours later…
4:31 AM
@DavidZaslavsky lol
 
 
2 hours later…
6:52 AM
And now, he has become the owner too..?
Could someone please appoint me to something else...?
It's so boring during daytime (when no one's active) LOL :-D
3 Cheers @Manishearth...
 
@CrazyBuddy I was the owner already
May 3 '12 at 23:19, by Feeds
Manishearth has been automatically appointed as owner of this room. (What does this mean?)
12 hours ago, by Stack Exchange
12 hours ago, by David Zaslavsky
@Manishearth I figured since you're a mod now there's no point in also being an owner of the room
 
Well, I didn't know that...?
Why so..??
 
5 hours ago, by Stack Exchange
Manishearth has been automatically appointed as owner of this room. (What does this mean?)
5 hours ago, by David Zaslavsky
hehe, @Manishearth I guess the computer has big plans for you
 
What's the use? - Is it some kinda moderator like thing...
 
@CrazyBuddy the room didn't have an owner
When a room has enough activity but no owner, an owner is automatically appointed from whoever is the most active
which was me
I wasn't a mod anywhere at the time
 
6:55 AM
Oh... I see... Then, Could many owners exist at a time?
 
Yep
It's a permissions thing
 
Don't you have colg. today?
Coz, I'm in colg. now..
 
Users can have explicit read access (for private rooms), explicit write access (for gallert/private rooms OR when the user doesn't have enough rep to chat), or ownership (wherever applicable)
@CrazyBuddy yeah. But no lectures atm
 
@Manishearth I didn't know that too :-D
 
I had one from 11-12 (slot is till 12:30, but the teacher says that the course only needs 1hr per slot). Then I have chem lab from 2-5, but it'll get over in 15mins since its the first day
 
6:58 AM
@Manishearth Do ya know Pongal..?
All lecturers went of...
 
@CrazyBuddy the food? yep.
Or the festival? That too
 
@Manishearth Er.. No
The festival
 
But not celebrated in my state
 
I know that...
 
and I don't know much about it :s
 
6:59 AM
@Manishearth There's no need to know abt it..
I came to say that all our colg. lecturers except a few (and the DEAN)
went to their homes (a vacation for upto 5 days)
We're enjoying today with seniors...
Taking several classes and dictating (on our own) - teasing several subjects, etc.. , etc...
A doubt though (not offensive)
If I wanna complain about you (as a chat owner) and expect a replace for you...
I'll talk to the mod. But in this case, being a mod, you may get my flag...
@Manishearth What then?
 
@CrazyBuddy ah. you wanna complain about a mod. this question has cropped up often :)
In chat, its a bit harder, but the easiest thing to do is go to the assembly and complain
also, chat flags are seen by all mods
so, there's a high chance that someone else will come and see
BUT, if a mod is misbehaving, the problem isn't just "he's an owner of this room"
 
@Manishearth Er... That was just a doubt though. For now, I like these mods :-)
 
I know :)
the problem then is "this mod is abusing his powers"
 
Is the assembly - made for all mods to assemble..? - at some time?
 
in which case, a meta post or an email to community@SE.com is better
 
7:09 AM
@Manishearth Well, Thats good...
 
@CrazyBuddy nah
 
What is it actually..?
Not a part of any site... - THEN?
 
@CrazyBuddy note that a meta post may not always be a good idea. If you write a calm, well-written email to community@, you probably will get a better response. A meta post may cause unnecessary drama and may be taken the wrong way
Note that if a mod "retaliates" to something like this, that generally is cause for temporary removal of the diamond
@CrazyBuddy The private mod room is this:
 
At least, other users would provide some intuitive look on the issue - if we post in meta..
 
The Assembly is the place for normal users to ask mods questions etc
 
7:11 AM
Then, it is related to MSO (along with the Tavern?)
 
@CrazyBuddy nah
that's on chat.mso
this room just doesn't have a parent site
 
Yeah...
Oh.. Okay - Got it :-)
 
All the rooms here don't
 
Why is that?
Isn't h-bar not related to Physics.SE?
 
They don't belong to any site
@CrazyBuddy it is
 
7:13 AM
No, I don't talk about "belonging"
 
that's why it is associated with phy.se
 
I just mention in relation to or relatively..!
 
No, the chat.SE rooms - have some relation to parent site (each site - its own non-private chat room)
 
Yeah, but that's not necessary
 
7:15 AM
Yeah....
 
You can make rooms not associated with any sites
 
I haven't tried that yet...
but not needed if it isn't necessary :-)
 
it is necessary, but I see no need for any new rooms :)
 
well, ok... gtg.. C'ya later Manish
 
cya :)
 
8:08 AM
Gee... I haven't noticed that I could change my picture...
Looks like I could forget gravatar now... (I've already forgot the password over there)
I could just add some fx to my smiley balls now :-D
 

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