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I came across this formula by Blevins for calculating the natural frequency of a hollow cylinder and was hoping that someone could answer a question I have for calculating the

f = A/(2*pi*L^2)*sqrt(E*I/m)

A= 9.87 for first mode

I = Area Moment of Inertia (m^4)

m= Mass per Unit Length (kg/m)

In this formula what equation should I use to determine the

*mass per unit length*(m). Here's the formula:f = A/(2*pi*L^2)*sqrt(E*I/m)

A= 9.87 for first mode

I = Area Moment of Inertia (m^4)

m= Mass per Unit Length (kg/m)

In this formula what equation should I use to determine the

**m**(mass per unit length) for a thin-walled cylinder? Also, does I = pi/64*(d^4-di^4) in this case?
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