b243970
Guest
question:
why the moment of inertia of a homogeneous cylinder internal radius r and outer radius r vale (m(r^2+r^2))/2? ? ?
According to me, integrating an infinitesimal cylindrical shell from r to r should be (m(r^2-r^2))/2;
and also considering the moment of inertia of a cylinder full of radius r, (mr^2)/2, less that of a cylinder full of radius r and negative mass would anyway i=(m(r^2-r^2))/2,
Then why isn't it? I searched around but on the books and on the internet I found only the formula put there so without development. Give me your sleep.
:frown:
why the moment of inertia of a homogeneous cylinder internal radius r and outer radius r vale (m(r^2+r^2))/2? ? ?
According to me, integrating an infinitesimal cylindrical shell from r to r should be (m(r^2-r^2))/2;
and also considering the moment of inertia of a cylinder full of radius r, (mr^2)/2, less that of a cylinder full of radius r and negative mass would anyway i=(m(r^2-r^2))/2,
Then why isn't it? I searched around but on the books and on the internet I found only the formula put there so without development. Give me your sleep.
:frown: