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![[Post New]](/templates/default/images/icon_minipost_new.gif) 30 Mar 2007 21:40:17 IST
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1.)a solid uniform disk of mass m & radius r is pivoted about a horizontal axis tangential to the rim of disc .A particle of mass m is attached to a point on the rim of the disc, diammetrically opposite to the pivot.The combination is now released from rest, with the plane of disc initially horizontal. find the angular velocity when the small particle reaches its lowest point. 2.)a kid of mass M stands at the edge of a platform of radius R which can be freely rotated about its axis . the moment of inertia of platform is 'I' The system is at rest when a friend throws a ball of mass m & the kid catches it.if the velocity of the ball is v horizontally along the tangent to the edge of platform when it was caught by the kid, find angular speed of the platform after the event.
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30 Mar 2007 21:46:50 IST
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hey is the answer to the 2nd one mvr/I ??
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What i wud lyk to be is unique....Govind |
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30 Mar 2007 21:55:50 IST
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and the ans to the first one.......is it 2 X root ( pie x g / 7r )
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What i wud lyk to be is unique....Govind |
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30 Mar 2007 22:14:46 IST
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answer of the first one is 2 into root of (g pie/7R)
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1 Apr 2007 21:55:51 IST
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hey cud sumone tell if the ans right or wrong?
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What i wud lyk to be is unique....Govind |
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3 Apr 2007 17:46:26 IST
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Hello Shikha, welcome to GOIIT community.
Seems u r new to the forum as it si your first post.
But dear protocol is you should ask just one/single question in one post.
DO let me know your preference.
And other question u please send as a separate post.
thank you.
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The Scientist does not study nature because it is useful; he studies it because he delights in it, & he delights in it because it is beautiful. If nature were not beautiful, it would not be worth knowing, life would not be worth living. Ofcourse I do not here speak of that beauty that strikes the senses, the beauty of qualities & appearances; not that I undervalue such beauty, far from it, but it has nothing to do with science; I mean that profounder beauty which comes from the harmoniuos order of the parts, & which a pure intelligence can grasp. |
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14 May 2007 11:56:28 IST
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hey ...... is there sumbody to tell if the answers are ryt or not?
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What i wud lyk to be is unique....Govind |
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14 May 2007 19:05:03 IST
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Q2
the ball has linear momentum=mv
hence its angular momentum is mvr...right?
now as there is NO TRANSLATIONAL MOTION there will be only angular momemtum
as the boy "caught" the ball the combined inertia of the system is
I+(m+M)r^2 ( I is inertia of platform and m+M is the combined mass of ball and boy)
and mom.=(I+(m+M)r^2).w
equating the momentum we have
w=mvr/I+(m+M)r^2
which is the answer..
dont forget to rateeeeee
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IIT- Imposible Is This(atleast fr meeeeeeeee) |
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