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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Nov 2007 17:32:01 IST
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A bobbin with thread wound round it is on a horizontal table and it can roll without sliding.If the end of the thread is pulled with a velocity 'v' in the horizontal direction,what is the velocity of the axis of the bobbin? Radius of inner cylinder-r " " outer cylinder-R. Please help... Rates assured(for previous questions also !! :-) )
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22 Nov 2007 19:36:22 IST
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The answer is: vR/R+r
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23 Nov 2007 17:41:04 IST
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Hmm... okay.. let me try this one
Edit - okay I think I am a bit confused with the linear velocity of a particle on the periphery. For a disc, V(at periphery) = V(cm) + Rw right?
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Will nip in at times to solve problems :)
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23 Nov 2007 17:47:32 IST
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Can someone explain clearly what is a bobbin? Is it a cylinder wound with thread simply or the thread is wound on it in a zigzag way?
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23 Nov 2007 17:48:41 IST
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Yeh karthik you are right.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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23 Nov 2007 17:55:56 IST
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let vel of axis is v1 and its angular speed be w
for pure rolling, v1-wR=0 or w=v1/R
velocity of thread with inner radius r = v
that means v1+wr=v
or v1+v1r/R=v
this gives v1=vR/(R+r)
if u don't understand, i will give u a figure for this
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
I am only one,
But still I am one.
I cannot do everything,
But still I can do something;
And because I cannot do everything
I will not refuse to do the something that I can do.
- Edward Everett Hale
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23 Nov 2007 17:58:54 IST
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Please give the figure. I don't know exactly what a bobbin is?
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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23 Nov 2007 18:02:32 IST
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ok this is the fig
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
I am only one,
But still I am one.
I cannot do everything,
But still I can do something;
And because I cannot do everything
I will not refuse to do the something that I can do.
- Edward Everett Hale
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23 Nov 2007 18:05:28 IST
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u may have seen hollow cylinders on which threads r wounded on an inner cylinder
thats called a bobbin
fig is from the crosssectional view of bobbin
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<TABLE CELLSPACING="1" CELLPADDING="1" BORDER="0">
<TR><TD>
<DIV ALIGN="right">Animated Letters</DIV></TD></TR></TABLE>
I am only one,
But still I am one.
I cannot do everything,
But still I can do something;
And because I cannot do everything
I will not refuse to do the something that I can do.
- Edward Everett Hale
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23 Nov 2007 18:20:10 IST
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Oh lol... I was thinking that the string is being pulled from the top of the bobbin. Didnt know that it was pulled from the middle. Good work mate
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Will nip in at times to solve problems :)
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24 Nov 2007 16:47:59 IST
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Thanks guys!!
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