A scuba tank and an air balloon are both filled with air. They are placed in direct sunlight.  What happens to them:

c.) The tank pressure increases  / the balloon expands


A 500 kg cement mooring block lies in 29 meters of FRESH water. The block displaces 300 liters. To move the block off the bottom, what is the minimum amount of water that must be displaced from a lifting device?

a.)   500 liters

b.)  300 liters

c.)   200 liters

d.)  The answer can not be determined

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