Rotational inertia of a rod that has mass on one end

[xd14]

Homework Statement

a 3 kg mass is on the end of a metal rod which is pivoted at one end. the mass of the rod is 2kg its length is 4 meters

Homework Equations

I=(ML^2)/3

The Attempt at a Solution

the rotational inertia of the rod itself is 10.6 but i don't know how the 3kg mass at the end would effect things

 

[PhanthomJay]

Homework Statement

a 3 kg mass is on the end of a metal rod which is pivoted at one end. the mass of the rod is 2kg its length is 4 meters

Homework Equations

I=(ML^2)/3

The Attempt at a Solution

the rotational inertia of the rod itself is 10.6 but i don't know how the 3kg mass at the end would effect things

Assuming the mass at the end has negligible size , what is the I of a particle of mass m about a pivot point , and then note the I of the rod-mass system is the sum of the I's of its parts.