# Moment of inertia formula

## Homework Statement

To calculate the moment of inertia of a cantilevered tapered tube with mid-thickness large radius RL and mid-thickness small radius RS

## The Attempt at a Solution

Area of the larger end of the tube
AL=2*pi*RL*t
Area of the smaller end of the tube
AS=2*pi*RS*t
Area of the tube at a distance x is
AX=2*pi*RX*t
RX=RL - x*tanalpha
tanalpha=deltaR/L
deltaR = RL-RS[/B]

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SteamKing
Staff Emeritus
Homework Helper
When you say 'calculate the moment of inertia', do you mean calculate the 'second moment of area' of the cross section of the tube (units of L4 ) or do you mean calculate the 'mass moment of inertia' of this piece (units of ML2 )? It makes a difference ...

When you say 'calculate the moment of inertia', do you mean calculate the 'second moment of area' of the cross section of the tube (units of L4 ) or do you mean calculate the 'mass moment of inertia' of this piece (units of ML2 )? It makes a difference ...
Second moment of area

SteamKing
Staff Emeritus