Monkey on a Rotating Cylinder

  • Thread starter Dr Meow
  • Start date
  • #1
13
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Homework Statement



A 13-kg solid steel cylinder with a 10-cm radius is mounted on bearings so that it rotates freely about a horizontal axis. Around the cylinder is wound a number of turns of a fine gold thread. A 4.0-kg monkey named Fred holds on to the loose end and descends on the unwinding thread as the cylinder turns. Compute Fred's acceleration and the tension in the thread.


Homework Equations


Acceleration: a= Vf-Vo
t
Tension Moving Down: Ft = Fg + ma


The Attempt at a Solution

 

Answers and Replies

  • #2
284
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What, no attempt at a solution? You're also going to need the moment of inertia of the cylinder, I believe
 
  • #3
13
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Sorry, my attempts at a solution only led me to the fact that Tension=MfG-MfA and then Tension=1/2McA and therefore MfG-MfA=1/2McA. "A" being acceleration, Mf being Mass of Fred, and Mc being mass of the cylinder and G being gravity.
 
  • #4
284
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Tension=1/2McA

Where did this come from? You should be able to relate the tension to the torque on the cylinder and to its angular acceleration.
 
  • #5
4
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Don't you have to keep more in mind than just the torque and tension? Such as gravity? I'm not sure how those would fit together.
 
  • #6
284
0
Yes, the last piece of the problem should be relating the angular acceleration of the cylinder to the acceleration of the monkey (and the forces on the monkey)
 

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