Mechanism of Mechanics.

A \(3\) Kg uniform rod rotates in a vertical plane about a smooth pivot at \(B\). A spring of constant \(K=300\) N/m and of unstretched length \(100\) mm is attached to The rod as shown .Knowing that in the position shown the rod has an angular velocity of \(4\) rad/s clockwise,determine the angular velocity of The rod after it has rotated through \(90^°\).


Take \(g=10 \) m/s^2

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