Elements Of Electromagnetics
7th Edition
ISBN: 9780190698614
Author: Sadiku, Matthew N. O.
Publisher: Oxford University Press
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3.32). As shown in Figure 3, a yo-yo toy is formed by wrapping a massless cord around a
disk of radius R= 0.2 m and mass M=3 kg. The cord is vertical and its top end is fixed and the disk is
initially stationary. The cord remains vertical for the entire motion and does not slide on the disk.
When the disk is released from rest, it falls down by a distance H=0.8 m, The moment of inertia of
the disk around its center is I disk=1/2mdiskR^2
a . Find the angular acceleration of the disk when it is lowered by a distance H.
b . Find the angular velocity of the disk when it is lowered by a distance H.
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