Bathyscaphes are capable of submerging to great depths in the ocean. What is the pressure at a depth of 5 km, assuming sea water has a constant specific weight of 10.1 kN m-³? Express your answer in kilopascals. The bathyscaphe contains several ballast tanks to regulate its buoyancy. If the dry mass of the bathyscaphe is 800 kg and its volume is 15 m³, the ballast tanks must contain what volume of seawater for the bathyscaphe to begin to sink?

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