Mechanics - iit jee problem for practice...a very famous 1 ........

1

skygirl ·2009-03-28 08:24:55

din get the question....

wat are initial conditions ? and in which way the cylinder is rolling ?

wat about that block .. is it long.. ?

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iitimcomin ·2009-03-28 08:26:48

BLOCK IS FIXED AND DONST CUM TO PICTURE ......

THE CYLINDER IS SLIGHTELY DISTURBED SO IT ROLLS OF THE EDGE..............

Q . FIND ANGLE UNTIL IT ROLLS ...........

THE CONDITIONS ARE SUCH THAT THE FRICTION IS SUFFICIENT TO MAKE IT ROLL.....

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skygirl ·2009-03-28 08:28:39

1.) Î¸=cos^-1(2/3) ?

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skygirl ·2009-03-28 08:30:15

2.) v= √2gR/3

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iitimcomin ·2009-03-28 08:30:25

nope [2]

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iitimcomin ·2009-03-28 08:30:42

cos inv 4/7

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skygirl ·2009-03-28 08:32:43

[2] 2nd wala bhi wrong hi hoga phir... ruko achhe se banate hai...

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shubh_452 ·2009-03-28 08:34:54

yes, cond. for no contact....

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skygirl ·2009-03-28 08:41:13

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skygirl ·2009-03-28 08:41:56

yep solving the above two we get cos^-1(4/7) ...

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skygirl ·2009-03-28 08:44:52

2.) solving above two only, v² = 4gr/7 => v = √4gr/7

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skygirl ·2009-03-28 08:57:10

3.)trans KE= 1/2m.4/7.gR + mgR.4/7 = 6/7mgR.

rot KE= 1/2. 1/2m. 4/7gR = 1/7gR.

so ratio=6.

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iitimcomin ·2009-03-28 09:16:07

ur rite now..........

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iit jee problem for practice...a very famous 1 ........

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iit jee problem for practice...a very famous 1 ........

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