Moment of inertia for an irregular shaped object

[Punchlinegirl]

An irregular shaped object of mass 2.45 kg has a moment of inertia 5.782 kgm2 about an axis through a point 1.40 m from its center of mass. Calculate the moment of inertia about a parallel axis through its center of mass.

I used the parallel axis theorem,
I= I_c + Mh^2
I= 5.782 +(2.45)(1.40)^2
I= 10.6 kgm^2

This wasn't right.. can someone tell me what I'm doing wrong. Thanks

 

[Pyrrhus]

You are asked for the moment of inertia about the centroid, yet you are calculating the moment of inertia about a parallel axis to the centroid axis...

 

[Cyrus]

I_c is not 5.782, I_C is what your solving for.

I just got beaten to it. Have fun cyclovenom, I am going back to learning matlab.

 

[Punchlinegirl]

ok I got it.. thanks

 

[Pyrrhus]

hahaha funny thing, this has happened two times already cyrus with the same theorem

Check https://www.physicsforums.com/showthread.php?t=98694