The rotational inertia of a disk about its axis is 0.70kgm2. When a 2kg mass is added to its rim ,0.40m what will be its rotational inertia?

1 Answer
Narad T.
Aug 7, 2018

The moment of inertia is #=1.02kgm^2#

Explanation:

The moment of inertia of the disc about the axis #O# is

#I_O=0.7kgm^2#

The moment of inertia of the mass is

#I_m=mr^2=2*0.4^2=0.32kgm^2#

The total moment of inertia is

#I=I_O+I_m=0.7+0.32=1.02kgm^2#

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