The system is at rest with the spring unstretched when θ = 0. The 5-kg uniform slender b...

The system is at rest with the spring unstretched when θ = 0. The 5-kg uniform slender bar is then given a slight clockwise nudge. The value of b is 0.4 m. (a) If the bar comes to momentary rest when θ = 40° determine the spring constant k. (b) For the value k = 90 N/m, find the angular velocity of the bar when θ = 25°.