Bar AB is straight and fixed in space. Spring CD has 4 N/mm stiffness and 200 mm unstretched length. If there is no friction between collar C and bar AB, determine: (a) The weight W of the collar that...

Bar AB is straight and fixed in space. Spring CD has 4 N/mm stiffness and 200 mm unstretched length. If there is no friction between collar C and bar AB, determine: (a) The weight W of the collar that produces the equilibrium configuration shown. (b) The reaction between the collar and bar AB