Two disks are free to rotate about a shared axle. The moment of inertia of the l

Question

Two disks are free to rotate about a shared axle. The moment of inertia of the lower disk is twice as large as the moment of inertia of the upper disk. As shown below, a disk either does not rotate, or rotates at an angular speed of or 2.

For the two configurations shown above: which one is true?

A) the magnitude of the angular momentum for the configuration A is greater than configuration B

B) the magnitude of the angular momentum for the configuration A is less than configuration B

C) the magnitude of the angular momentum for the configuration A is the same as configuration B

Explanation / Answer

C)both have same since first one cancels out the angular momentum of each disk leading to zero

while the second one will be zero if calculated

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