# Joint Entrance Examination/2000 Screening/Q018 Spinning rod with a bead on it, time when it starts slipping

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| Original Question by Dharav Here's the question... A long horizontal rod has a bead which can slide along its length and is initially placed at a distance L from one end A of the rod. The rod is set in angular motion about A with a constant angular acceleration, α. If the coefficient of friction between the rod and the bead is μ, and gravity is neglected, then the time after which the bead starts slipping is ${\sqrt {\frac {\mu }{\alpha }}}$ ${\frac {\mu }{\sqrt {\alpha }}}$ ${\frac {1}{\sqrt {\mu \alpha }}}$ infinitesimal Posted by Dharav 04:50, 18 August 2009 (UTC) | What's Up? Latest discussions on the forum Mechanics-Help Joint Entrance Examination/2000 Screening/Q028 Ball dropped from a height, graphs Joint Entrance Examination/2000 Screening/Q004 Roatting triangular frame with beads, what quantities are conserved Joint Entrance Examination/2000 Screening/Q018 Spinning rod with a bead on it, time when it starts slipping Joint Entrance Examination/2000 Screening/Q027 Wind power turbine relation between wind speed and output power Joint Entrance Examination/2000 Screening/Q003 A tank with two holes, one square and another round Physics-Help User:Thewinster/Sandbox/Forum-Watch User:Thewinster/Sandbox Joint Entrance Examination/2000 Screening/Q001 X Ray Tungsten filament and electrons Joint Entrance Examination/2000 Screening/Q010 Intensity versus wavelength graphs of blackbodies Joint Entrance Examination/2000 Screening/Q033 Glass slab in water and total internal reflection |
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