Question
A playground merry-go-round has a radius of 3m and a moment of inertia of 1500 kg...
A playground merry-go-round has a radius of 3m and a moment of inertia of 1500 kg m^2. 4 kids sit at the outer edge with each kid having a mass of 20 kg, and the merry-go-round spins at 1.75 rad/s. If 2 of the 4 kids move to a position that is 0.3m from the center of the merry-go-round, what is the new rotational speed of the merry-go-round? No energy is lost to friction and the children are point masses.
Homework Answers
Answer #1
Find the initial and final moment of inertia of the system and
use conservation of angular momentum to find the final angular
speed as shown below
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