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Question2 Marks: 10
A 3kg plastic tank that has a volume of 0.2m3 is filled with liquid water. Assuming the density of water is 1000kgm-3determine the weight of combine system.
Assumption The density of water is constant throughout.
mwater= ρV=(1000 kgm-3)( 0.2 m3)=200kg 3 Marks
mtotal= mwater + mtank=200kg + 3kg = 203kg 3 Marks
W=mg=(203 kg)(9.81ms-2)=1991.40N ≈ 1990N (up to 3 significant digits) 4 Marks