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**Q.1 A simple mass-spring oscillatory system consists of a mass m, suspended from a spring of stiffness k. Considering z as the displacement of the system at any time f, the equation of motion for the free vibration of the system is The natural frequency of the system is [2019 : 1 Mark, Set-I](a) m/k(b) k/m(c) (d) Ans.**(D)

Comparing with

We get

For the externally applied moment of 30 kNm at node F, the rotation (in degrees, round off to 3 decimals) observed in the rotational spring at node H is___________ [2019 : 2 Marks, Set-II]

No moment can be taken by segment FE

∴ M

Ans.

By giving unit displacement in 2^{nd} direction without giving displacement in any other direction, the force developed R_{B}, is,

(∴ Δ = 1)

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