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# Physics: Moment of Inertia of disk B

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Two disks are rotating about the same axis. Disk A has a moment of inertia of 8.86 kg·m2 and an angular velocity of +8.31 rad/s. Disk B is rotating with an angular velocity of -9.45 rad/s. The two disks are then linked together without the aid of any external torques, so that they rotate as a single unit with an angular velocity of -2.95 rad/s. The axis of rotation for this unit is the same as that for the separate disks. What is the moment of inertia of disk B?

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#### Solution Preview

As the linking of the two discs takes place without application of any external torque (i.e. the system is isolated), law of conservation of angular momentum applies.

Initial ...

#### Solution Summary

The moment of inertia of disk B is determined. The axis of rotation for the unit is given.

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