Homework Help: physics

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

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