LJ. Question 5 (7 marks} A wooden sphere is held below the surface of a fresh-water lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.50 ms and the tension in the cord is 300 N. a) Determine the buoyant force exerted by the water on the sphere. b) Find the mass of the sphere. The cord now breaks and the sphere rises to the surfaoe, eventually coming to rest. c) Find the fraction of the sphere's volume that is now submerged