You understood correctly shaft is passing from the centre of the both discs perpendicularly and from the centre of the Hollow shell parallel to the axis of the shell and each disc is welded at the each end of the hollow shell.
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I understood what you mean just make it sure either...
I am confused with how to find moment of inertia of composite example. Like a hollow shell having one disc at each end and a shaft in the centre. How to find out Moment of Inertia if Force is applied tangentially on the shell and if force is applied tangentially on the shaft. Should I sum up...