The slender rod AB of length l = 30 in. is attached to a collar at B and rests on a small wheel located at a horizontal distance a = 4 in. from the vertical rod on which the collar slides. Knowing that the coefficient of static friction between the collar and the vertical rod is 0.25 and neglecting the radius of the wheel, determine the range of values of P for which equilibrium is maintained when Q = 25 lb and θ = 30^o.