Question #b30cd

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Answer 1 · 2016-04-13T23:55:51

I used the definition of density:

I think you mean density of air not water (water density should be approx. #1000(kg)/m^3#).

You can use the relationship between density, #rho#, volume, #V#, and mass #m#:

#rho=m/V#

in your case (for the 4 options) you have:

1) #V_1=2m^3# of bricks:
#m_1=rho_("bricks")*V_1=2000*2=4000kg# Lowest mass of bricks

2) #V_2=4m^3# of bricks:
#m_2=rho_("bricks")*V_2=2000*4=8000kg#

3) #V_3=6000m^3# of air:
#m_3=rho_("air")*V_3=1*6000=6000kg# lowest mass of air

4) #V_4=10000m^3# of air:
#m_4=rho_("air")*V_4=1*10000=10000kg#