doubts on gravitation,mechanical properties etc

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doubts on gravitation,mechanical properties etc

Physics
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HI THX FOR CMING ...i hav many doubts so pls stay k?
Sure, I'll try
wow thx

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xplain tangential acceleration and radial acceleration .how to find net acceleration?when are the cases when they become 0 alternatively?
turing?
|dw:1329408300806:dw|the terms are not quite what I'm used to, but radial acceleration is a result of the change in direction of the object:\[a=\frac{v^2}r\]it is because the motion vector changes that we get this acceleration (change in direction always means acceleration is happening) so if the object is moving in a straight line the radial acceleration (I call it centripetal acceleration) is zero
this illustrate that the change in direction causes an acceleration because the velocity vector changes|dw:1329408593274:dw|As for tangential acceleration that is a result of the object speeding up or slowing down linearly. if, say, we have an object moving in a circular path we have\[a=\alpha r\]where alpha is the angular acceleration:\[\alpha=\frac{d\omega}{dt}\]So if the angular velocity is changing, the object is experiencing a tangential acceleration.
k
so radiall acc does not contribute to change in angular velocity?
doubt 2:when an apple falls towards earth the earth moves up to meet the apple .is this true xplain?
no radial acceleration happens just by virtue of the object turning, tangential means the object is actually speeding up along the direction of motion (circle, line, whatever) Last question: Yes this is true, because the all forces come in action-reaction pairs. Because the earth exerts a force (gravity) on the apple, the apple exerts a gravity force on the earth. The magnitudes of those forces are the same, therefor the earth doesn't move much, but it must theoretically move some.
hey why does earth move less?
because it is more massive, and\[F=ma\]m of the apple is small, and m of the earth is large, so the same force on the apple and earth will cause a much greater acceleration on the smaller mass (the apple) than the earth
k so a body in uniform circular motion has 0 tangential acceleration?
right
do u know applications of modulus of elasticity?
if v1=v2 from one point to the next we have 0 change in tangential velocity, which is tangential acceleration of 0|dw:1329409969038:dw|
mmm... I never really studied that stuff much. which modulus are we talking about, young's?
ya
turing?
|dw:1327595834758:dw|
beam of girder is I shape why?
srry or girder
hmm... not sure I can answer that effectively
what does product of speed and area give us?
not sure I understand what you mean
area of what?
area of crossection of a tube
and speed of water thriugh it
Volume of water /second
well area times velocity is a constant for an incompressible fluid like water, so when the tube narrows the speed of the water increases. I'm pretty sure they multiply to unit volume passing though the area in question
^oh good, I'm right
ya hw u got that?
Speed= distance/ time Area*distance/time Volume/time
...or just looking at units\[v\times A=\frac ms\cdot m^2=\frac{m^3}{s}\]which at least suggests it's volume over time
k
hey turing hw long will u be here?
(Also ash)
:P
Aravind won't be able to help you with rotation:( I've completely forgotten about it
Mexican holiday today, but I still gotta eat breakfast :P
i dont need rotation help k i hav some other doubts
hey turing tell time
I'll be here for 5 minutes more, have to study
:P
me 2 thats y i enquired
I'll be here until I get hungry!
u see i get a lot of doubts wen i study
i want to make sure smone will be here to help me
u see i hav imp exams
Aravind preparing for JEE?
yes
nic guess
I will get my brother to help you some time, he knows much more than me
so turing can i cm online after smtime with a bunch of doubts pls be here :P
@ash wow where is he studying ??iwhats his name?>
yeah, most likely in an hour or two is good
He's in IIT Bombay, his name is suyash
k thx pal i wanna be the topper in the xam pray for me and help me k?
wow is he there in openstudy?
ok, i'll surely. He's there but comes very less
k can u tell him ...its my biggest aim to reach iit pls tell him to come ...i would be glad if he is willing to use skype :P
ash?
Aravind G, he can't use skype, he doesn't have laptop but I'll ask him to come. And I'll also try to help you out. You can find me more here

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