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Second Moment of Area help watch

1. Hi guys,

I just wanted to ask, how can you calculate the second moments of area about the y and z axes in a beams cross section if the beam cross section is a hollow circle?
The outer radius is given in the question alongside the thickness and length of beam member. The youngs modulus is also given. Taking into account the length, the beam is probably a hollow cylinder, but I am getting confused which equations to use.

Also, is there a simple formula to calculate the torsional constant J for this same cylinder with circular cross section?

p.s In the example im looking at i think the beam members x- axis is going along its length., y axis and z are perpendicular to eachother. y facing upwards and z horizontally,

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Updated: December 3, 2010
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