Question [1]: A 10-kg rod is rotating with angular velocity of w=4 rad/s when it is vertical. Two springs with the same stiffness k? and unstretched length of 1.5 m pin connected to the rod. Determine the spring stiffness k such that the angular velocity of the rod will be zero (2=0) when the rod is in horizontal position. [20 marks]
E 2
K=?
G
E
K=?
B
E
1.5 m
4m