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Mechanics

Scorching goIITian

Joined:	28 Feb 2007
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16 Mar 2007 23:07:34 IST

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851

circular motion

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Comments (8)

arvind1990

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16 Mar 2007 23:09:40 IST

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angular velocity=omega=v/r!!

Prateek Agarwal

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16 Mar 2007 23:10:54 IST

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well...thats what even i thought...but the correct answer is (b)...i need 2 know y???

jalanshruti

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17 Mar 2007 07:56:01 IST

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angular velocity is v/r from centre of circle not from pt on the circle

the pt can b fixed anywhere on circle so lrt us fix it at diametrically oppo. to body executing motion. Now body moves with radius 2r wrt that pt.

= v/2r (considering initial motion of body pure rotatory wrt fixed pt.)

kislay kumar

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17 Mar 2007 11:32:32 IST

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well jalanshruti the particle will move about any point on the circle with radius as 2r if its is always diametrically oppo.to the fixed point .but the case is diff.

Here is correct solution.
Let the angular velocity of any body in circular motion be

about the center of circle .but d

/dt of the particle about any point on the circle is equal to

/2(any arc subtends on the centre twice the angle subtended at any point on the circle )

=v/r(about centre)

/2=v/2r.(about any pt. on circle)
please rate me!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

ARUN K

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Joined: 17 Feb 2007

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17 Mar 2007 12:09:42 IST

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=V/R

WHERE R IS THE RADIUS OF THE CIRCLE

HERE R=2r
SO

=V/2r

PLS RATE

Prateek Agarwal

Scorching goIITian

Joined: 28 Feb 2007

Posts: 287

17 Mar 2007 19:10:07 IST

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hey kislay...i think ur right...i never thought of this in that way...plz tell me have u done this earlier and i'll give u a salute...

kislay kumar

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Joined: 7 Mar 2007

Posts: 784

17 Mar 2007 19:18:19 IST

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no prateek i had not done that before.pls rate!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Prateek Agarwal

Scorching goIITian

Joined: 28 Feb 2007

Posts: 287

17 Mar 2007 19:20:53 IST

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thnx man...rated u...

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