1. A thin spherical shell of mass 0.400 kg and diameter 0.200 m is filled with alcohol (Ď = 806 kg/m3). It is then released from rest at the bottom of a pool of water. Find the acceleration of the alcohol-filled shell as it starts to rise toward the surface of the water.
2. A rectangular air mattress is 2.0 m long, 0.50 m wide and 0.08 m thick. If it has a mass of 2.0 kg, what additional mass can it support in water?
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