Re: An IITJEE problem

N:dlzc D:aol T:com (dlzc):
Dear Nishu:

"Nishu" <amitk_dni@xxxxxxxxxxx> wrote in message news:1146152710.843745.302370@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have a SHM problem.

"Simple Harmonic Motion"

A rod of length L is placed on two circular dics.
The co-efficient of friction between rod and disks
is k. The rod is displaced by a small distance x.
Determine the time period of the oscillations.

_______________________
O O <----disks
<-------------- L ----------------->


The answer is t = 2??(L/2kg) [g- acc due to gravity)
But I want the solution.

The problem setup is lacking much.

Try this figure:

================================
(o) L (o)
A B

I assume the disks are acting like wheels, so there would be no SHM.

If the wheels, A and B, are *counter rotating*
(driven at the same angular speed) the rod will
move (slide) to and fro.

Your formula gets trashed if you do not use ASCII.
Is this t = 2 . pi . sqrt( L / (2 . k . g) ) ?

Seems to be correct.

David A. Smith

mL
.

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