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`        sir please explain what exactly perpendicular and parallel axis theorem`
7 years ago

419 Points
```										Dear Simran

parallel axis theorem:
The moment of inertia about the  axis z is given by:
$I_z = I_{cm} + mr^2,\,$
where:
$I_{cm}\!$ is the moment of inertia of the object about an axis passing through its centre of mass and parallel to the z axis;$m\!$ is the object's mass;$r\!$ is the perpendicular distance between the two axesperpendicular axis theorem:
The perpendicular axis theorem states that if body lies in XY plane then                                                       IZ = IX + IYwhere,

IX be the moment of inertia of the body about the X axis;
IY be the moment of inertia of the body about the Y axis; and
IZ be the moment of inertia of the body about the Z axis

The 3 axis X, Y and Z are mutually perpendicular to each other

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```
7 years ago
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