Question

the quantity YaK2 is called​

Answer 1

The Yak-2 was initially known as the Ya-22, in the Yakovlev OKB numbering sequence, before it was redesignated as the Yak-2 in 1941. It was of mixed construction with wooden wings and center fuselage, duralumin forward fuselage, and steel tube framing in the rear fuselage with a wooden upper decking and fabric skin.

Explanation:

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Answer 2

Answer :

The term $YAk^2$ is called Flexural Rigidity.

Explanation :

$YAk^2$ is quantitatively defined as the External Bending Moment of a beam required to produce unit radius of curvature.

And Internal Bending Moment = $YAk^2/R$.

Two equal and opposite force acting on beam constitute a couple of moment.Certain lines along the length of the beam are extended, others are compressed, while some are unaltered in length. The latter lie ina surface, called the neutral surface. The resultant elastic reaction will produce forces in both parts of the beam and these will constitute a system of couples, whose resultant may be called internal bending moment.

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