Posted by **dmkp** on Tuesday, January 29, 2013 at 11:14am.

The second moment of area of a hollow cylindrical beam with an inner radius of 18mm and an outer radius of 20mm is equal to

A) 2.7x10-9m 4

B) 4.3x10-8 m 4

C) 7.9x10 - 13m 4

D) 2.7x10 3 m 4

- mechanics of materials -
**Elena**, Tuesday, January 29, 2013 at 12:58pm
J=π(D²-d²)/32 =...

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