Each of the uniform bars oa and ob has a mass of 2.0 kg and is freely hinged at o to the vertical shaft, which is given an upward acceleration a = 5.01 m/s2. the links which connect the light collar c to the bars have negligible mass, and the collar slides freely on the shaft. the spring has a stiffness k = 103 n/m and is uncompressed for the position equivalent to θ = 0. calculate the angle θ assumed by the bars under conditions of steady acceleration.