Question

Two metal disks, one with radius R1 = 2.60 cm and mass M1 = 0.900 kg and the other with radius R2 = 5.10 cm and mass M2 = 1.50 kg, are welded together and mounted on a frictionless axis through their common center (see figure below). a) What is the total moment of inertia of the two disks? b) A light string is wrapped around the edge of the smaller disk, and a 1.50 kg block is suspended from the free end of the string. If the block is released from rest at a distance of 1.60 m above the floor, what is its speed just before it strikes the floor? c) Repeat part B, this time with the string wrapped around the edge of the larger disk

          Two metal disks, one with radius R1 = 2.60 cm and mass M1 = 0.900 kg and the other with 
radius R2 = 5.10 cm and mass M2 = 1.50 kg, are welded together and mounted on a 
frictionless axis through their common center (see figure below).
a) What is the total moment of inertia of the two disks?
b) A light string is wrapped around the edge of the smaller disk, and a 1.50 kg block is 
suspended from the free end of the string. If the block is released from rest at a 
distance of 1.60 m above the floor, what is its speed just before it strikes the floor?
c) Repeat part B, this time with the string wrapped around the edge of the larger disk

Added by Dr Anas S.

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