A mass attached to a cord around a disk

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The discussion revolves around a physics problem involving a frictionless pulley and a falling bucket. The key questions are about calculating the tension in the cord and the torque on the pulley. Participants suggest using conservation of energy to determine the speed of the bucket, then differentiating to find acceleration. Newton's second law is recommended for calculating the tension in the cord. The emphasis is on applying fundamental physics principles to solve the problem effectively.
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Homework Statement



Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.200 m which is used to draw water from a well. A bucket of mass m = 1.50 kg is attached to a massless cord wrapped around the pulley. The bucket starts from rest at the top of the well and falls for t = 3.00 s before hitting the water h = 9.99 m below the top of the well.

What is the tension in the cord?
What is the torque that is applied to the pulley due to the cord?

Homework Equations


Torque=force*radius
Tension=mass*g?


The Attempt at a Solution


 
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Hi disque! :smile:
disque said:
Torque=force*radius

Yes :smile:
Tension=mass*g?

No … use conservation of energy to find the speed, differentiate for the acceleration, then use good ol' Newton's second law to find the tension :wink:
 

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