Homework Answers
density of aluminium=2830 kg /m^3
volume of block = mass / density = 1 kg/ 2830 = 3.553 x 10^-4 m^3
Scale reading = Weight - buoyant force = mg - Vg = 1 (9.8 ) -
1000 ( 3.553 x 10^-4) 9.8 = 9.8 - 3.48 = 6.32 N apprx
b) for floating , weight of ballon= buoyant force
0.3 (9.8) = Vg ( where
of air=1.2
kg/m^3)
V = 0.25 m^3
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