Problem D7: Initially, a disk is spinning. The disk has a mass of m₀ and a radius of R₀. The kinetic energy of rotation that it initially has is E₀. Then, another disk (initially not rotating) is placed on top of the first one. The second disk has a mass of n₁m₀ and a radius of n₂R₀. The axes of the two disks are in line. There is friction between the two disks, and the two disks end up spinning at the same rate. What is the final kinetic energy of rotation of the two disks? If the final rotational energy of the system is E = E₀/n₃, what is n₃? Note: n₁, n₂, and n₃ are unitless.

n1 =	n2 =	Input n3:

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Problem: