doubts on gravitation,mechanical properties etc

- AravindG

doubts on gravitation,mechanical properties etc

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- AravindG

HI THX FOR CMING ...i hav many doubts so pls stay k?

- TuringTest

Sure, I'll try

- AravindG

wow thx

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## More answers

- AravindG

xplain tangential acceleration and radial acceleration .how to find net acceleration?when are the cases when they become 0 alternatively?

- AravindG

turing?

- TuringTest

|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

- TuringTest

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.

- AravindG

k

- AravindG

so radiall acc does not contribute to change in angular velocity?

- AravindG

doubt 2:when an apple falls towards earth the earth moves up to meet the apple .is this true xplain?

- TuringTest

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.

- AravindG

hey why does earth move less?

- TuringTest

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

- AravindG

k so a body in uniform circular motion has 0 tangential acceleration?

- TuringTest

right

- AravindG

do u know applications of modulus of elasticity?

- TuringTest

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|

- TuringTest

mmm... I never really studied that stuff much.
which modulus are we talking about, young's?

- AravindG

ya

- AravindG

turing?

- AravindG

|dw:1327595834758:dw|

- AravindG

beam of girder is I shape why?

- AravindG

srry or girder

- TuringTest

hmm... not sure I can answer that effectively

- AravindG

what does product of speed and area give us?

- TuringTest

not sure I understand what you mean

- TuringTest

area of what?

- AravindG

area of crossection of a tube

- AravindG

and speed of water thriugh it

- ash2326

Volume of water /second

- TuringTest

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

- TuringTest

^oh good, I'm right

- AravindG

ya hw u got that?

- ash2326

Speed= distance/ time
Area*distance/time
Volume/time

- TuringTest

...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

- AravindG

k

- AravindG

hey turing hw long will u be here?

- AravindG

(Also ash)

- AravindG

:P

- ash2326

Aravind won't be able to help you with rotation:(
I've completely forgotten about it

- TuringTest

Mexican holiday today, but I still gotta eat breakfast :P

- AravindG

i dont need rotation help k i hav some other doubts

- AravindG

hey turing tell time

- ash2326

I'll be here for 5 minutes more, have to study

- AravindG

:P

- AravindG

me 2 thats y i enquired

- TuringTest

I'll be here until I get hungry!

- AravindG

u see i get a lot of doubts wen i study

- AravindG

i want to make sure smone will be here to help me

- AravindG

u see i hav imp exams

- ash2326

Aravind preparing for JEE?

- AravindG

yes

- AravindG

nic guess

- ash2326

I will get my brother to help you some time, he knows much more than me

- AravindG

so turing can i cm online after smtime with a bunch of doubts pls be here :P

- AravindG

@ash wow where is he studying ??iwhats his name?>

- TuringTest

yeah, most likely in an hour or two is good

- ash2326

He's in IIT Bombay, his name is suyash

- AravindG

k thx pal i wanna be the topper in the xam pray for me and help me k?

- AravindG

wow is he there in openstudy?

- ash2326

ok, i'll surely. He's there but comes very less

- AravindG

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

- AravindG

ash?

- ash2326

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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