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

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To keep the hanging cylinder at rest while a puck slides in a circle on a frictionless table, the correct speed must be calculated using the relationship between centripetal force and gravitational force. The mass of the puck is 1.00 kg, and the radius of the circular path is 17.0 cm. An initial attempt suggested a speed of 0.785 m/s, which was later identified as incorrect due to a miscalculation regarding the radius. The correct radius is confirmed to be 17 cm, not 1.7 cm. Accurate calculations are essential for determining the speed required to maintain equilibrium in this system.
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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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