Question: A 3-kg slender rod rotates in a vertical plane about a pivot at B. A spring of constant k = 300 N/m and of un-stretched

A 3-kg slender rod rotates in a vertical plane about a pivot at B. A spring of constant k = 300 N/m and of un-stretched length 120 mm is attached to the rod as shown. Knowing that in the position shown the rod has an angular velocity of 4 rad/s clock wise, determine the angular velocity of the rod after it has rotated through

(a) 90?,

(b) 180?.

B D 150 mm 360 mm

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