A linear torsional spring deforms such that an applied couple moment M is related to the s...

A linear torsional spring deforms such that an applied couple moment M is related to the spring’s rotation θ in radians by the equation m = (20 θ) N • m. If such a spring is attached to the end of a pin-connected uniform 10-kg rod, determine the angle θ for equilibrium. The spring is undeformed when θ = 0°.