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zalnas
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Homework Statement
A uniform-density 7 kg disk of radius 0.27 m is mounted on a nearly frictionless axle. Initially it is not spinning. A string is wrapped tightly around the disk, and you pull on the string with a constant force of 45 N through a distance of 0.9 m. Now what is the angular speed?
Homework Equations
Krot = .5*I*omega2
Idisk = .5*m*R2
K = .5*m*v2
where I is the moment of intertia
The Attempt at a Solution
I've attempted setting Krot equal to the force applied times the distance over which it is applied. I then plugged in I using the given information, and solved for the period from the Krot equation.