What is the correct speed to keep the cylinder at rest?

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SUMMARY

The correct speed to keep the hanging cylinder at rest in this scenario is 0.785 m/s. The problem involves a puck of mass 1.00 kg sliding in a circle of radius 17.0 cm on a frictionless table, connected to a hanging cylinder of mass 3.70 kg. The equations of motion applied include F=ma and a=v²/r. A common mistake noted in the discussion was miscalculating the radius as 1.7 cm instead of the correct 17.0 cm.

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Homework Statement


A puck of mass m = 1.00 kg slides in a circle of radius r = 17.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.70 kg by a cord through a hole in the table. What speed keeps the cylinder at rest?

http://edugen.wileyplus.com/edugen/courses/crs7165/art/qb/qu/c06/q55.jpg
[/B]

Homework Equations


F=ma, a=v2/r[/B]

The Attempt at a Solution


I don't see why 0.785m/s is incorrect. thanks.[/B]
http://i1164.photobucket.com/albums/q562/falsovero/20150630_150006_zpsk3vkjyjj.jpg
 
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The radius is 17 cm, not 1.7 cm.
 
thanks, what an elementary mistake.
 

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