Posted by **Claudia** on Monday, January 19, 2009 at 3:51pm.

a 3.5 kg rectangular air mattress is 2.73m long, 1.1m wide, and .124m thick.

what mass can it support in water befor sinking?

answer in units of kg.

so do i do volume times density=mass?

3.5*2.73*1.1*.124=1.303302

- physics -
**bobpursley**, Monday, January 19, 2009 at 4:05pm
No.

The bouyancy is equal to volume*densitywater(g).

Supported Weight=bouyancy-weightmat

mg=volume*density*g-3.5kg

masssupported=volume*densiy -3.5kg

where density is the density of water.

- physics -
**Claudia**, Monday, January 19, 2009 at 4:11pm
density of water=1.0*10^3

so,

26*3.9*23*(1.0*10^3)-3.5=2332196.5

- physics -
**Naz**, Wednesday, November 5, 2014 at 1:09pm
I don't know 😭😭😭

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