Question

Which of the following is correct?

(a) Radius of gyration K = (I/A)^0.5

(b) Radius of gyration K = (I/A)^0.8

(c) Radius of gyration K = (I/A)*0.2

(d) Radius of gyration K = (I/A)*0.8

The question was posed to me during an internship interview.

My question comes from Structural-Analysis Fundamentals topic in chapter Structures and Loads of Aircraft Design

Answer 1

Right option is (a) Radius of gyration K = (I/A)^0.5

To explain I would say: Above relationship is used to correlate radius of gyration K with moment of inertia I and cross section area A. Correct relationship is given by, radius of gyration K=(I/A)^0.5 where, I = moment of inertia and A is the cross section area.