A closed 2.9 litre bottle with a weight of 1.8 kg is completely immersed in water.
How many litres of water has the bottle displaced?
What is the mass of the displaced water?
What is the upthrust on the bottle?
What force F of the arm do we have to apply to the bottle to keep it under the water?
If the bottle is lowered and released so that it rises freely towards the water level, what is the resultant of all the forces on the bottle when it is released?
In which direction does the resultant of the forces point as the bottle moves toward the water surface?
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