Final answer:
The anodes of high capacity X-ray tubes rotate at speeds up to 10,000 rpm, aiding in heat dissipation and enhancing the longevity of the tube.
Step-by-step explanation:
The anodes of high capacity X-ray tubes typically rotate at speeds up to 10,000 rpm, although some may reach up to 18,000 rpm or more to dissipate the heat generated during operation. The rotation of the anodes helps to distribute the thermal load and extend the life of the X-ray tube. While a rotation speed of 1.83 × 107 rpm mentioned in an example is theoretically possible, it's far above what can be achieved with current mechanical systems and is considered unreasonably high for practical use.