An undersea research chamber is spherical with an external diameter of 5.50 m . the mass of the chamber, when occupied, is 87600 kg . it is anchored to the sea bottom by a cable. the density of seawater is 1025 kg/m3.part a what is the buoyant force on the chamber? express your answer to three significant figures and include the appropriate units. part b what is the tension in the cable? express your answer to two significant figures and include the appropriate units.