Find Max mass(not weight) supported by an air matress in fresh water.

[dspivak01]

1. An air mattress is 2.4 m long, 0.65 m wide, and 12 cm deep.



2. If the air mattress itself has a mass of 0.21 kg, what is the maximum mass it can support in freshwater?



3. I have absolutely no clue in which direction to go in once i found the buoyant force, which I am not sure is right either.

Please Help

 

[berkeman]

1. An air mattress is 2.4 m long, 0.65 m wide, and 12 cm deep.



2. If the air mattress itself has a mass of 0.21 kg, what is the maximum mass it can support in freshwater?



3. I have absolutely no clue in which direction to go in once i found the buoyant force, which I am not sure is right either.

Please Help

What is the volume of the mattress? What would an equivalent volume of water weigh?

Given that number, and the weight of the mattress, what can you say about what buoyant force the mattress can generate when fully submerged in water?