Final answer:
The provided information is related to physics concepts such as moment of inertia and magnetic fields, not to the calculation of a solid's volume using disks or washers in mathematics. The student should look into calculus resources for the correct solution.
Step-by-step explanation:
The question appears to be asking about the calculation of the volume of a solid of revolution using the method of disks or washers. However, the reference information provided pertains to concepts of the moment of inertia, shear deformation of a spinal disk, and the magnetic field produced by a rotating charged disk. These topics are related to physics and do not address the original mathematical question. To find the volume of the solid of revolution about the x-axis, we must apply integral calculus, specifically using the disk or washer method. This involves integrating the area of circular cross-sections perpendicular to the axis of rotation. The student should consult resources specific to calculus to find the appropriate formulas and methods for solving their particular problem.