A 3 ft. diameter cylindrical block with specific weight 50 lb/ft3 is supported by a spring whose force is given by F=kx.(diameter=3 ft.; height=2 ft.)
With a spring constant k=10 lb. /in. The spring is at its free length, i.e. x=0, with the block being held at the fluid surface. Calculate how far the block will sink into oil with specific gravity 0.9 when released.