- #1
howsockgothap
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Homework Statement
A solid door of mass 25.40 kg is 2.31 m high, 1.48 m wide, and 2.58 cm thick. What is the moment of inertia of the door about the axis through its hinges?
Homework Equations
I=(1/12)m(a^2 + b^2) + mr^2
(parallel axis theorem)
The Attempt at a Solution
I initially used the door height and width as a and b (I'm sure this is right) and used the door thickness as the distance between axis. On further thought it's obvious that my distance between the axis (r) is not the door thickness. I guess my confusion comes from knowing what to use in that area of the eq'n.