The uniform slender rod has a mass of 9 kg. If the spring is unstretched when θ = 0°, de...

The uniform slender rod has a mass of 9 kg. If the spring is unstretched when θ = 0°, determine the magnitude of the reactive force exerted on the rod by pin A when θ = 45°, if at this instant ω = 6 rad/s. The spring has a stiffness of k = 150 N/m and always remains in the horizontal position.