Child on a Merry-Go-Round: Calculating Angular Velocity After Moving Inward

  • Thread starter Steveadams79
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In summary, a child with a mass of 40kg moves from a distance of 2m to 1.5m from the center of a merry go round spinning at 30rpm's. The problem involves finding the change in the rotational speed of the merry go round. The key is to understand that there is no net external torque acting on the system.
  • #1
Steveadams79
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Homework Statement


A child with a mass of 40kg is sitting 2m from the center of a merry go round. He moves inward to a point 1.5m from the center. If the merry go round was originally spinning at 30rpm's, how fast is it spinning after the child moves inward?


Homework Equations





The Attempt at a Solution

 
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  • #2
Welcome to PF.

How would you think to approach the problem?
 
  • #3
I really do not have a clue. i can't seem to find which formula I need to use.
 
  • #4
What is the initial state?
What is the final state?
The preservation of what quantities holds here?
 
  • #5
Hint: No net external torque acts on the system.
 

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