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

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Homework Help Overview

The problem involves a child moving inward on a merry-go-round and seeks to determine the angular velocity after this movement. The subject area pertains to rotational dynamics and conservation laws.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants are discussing the initial and final states of the system and questioning which physical quantities are conserved during the child's movement. There is uncertainty about the relevant formulas to apply.

Discussion Status

Some participants are offering hints regarding the absence of net external torque, which may guide the exploration of conservation principles. Multiple interpretations of the problem's setup are being considered.

Contextual Notes

The problem does not provide specific formulas or detailed equations, and participants are grappling with the foundational concepts necessary to approach the solution.

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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

 
Physics news on Phys.org
Welcome to PF.

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

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