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Wc = Wu - Wc
= ρb.g.Vb - ρc.g.Vb
= g.Vb (ρb-ρc)
= g. mb (1 - ρc/ρb)
40 = 10.6 (1- 800/ρb)
2 = 3-2400/ρb
-1 = -2400/ρb
ρb = 2400
a. Fa = Wu - Wc
= 60 - 40
= 20 N
b. Fa = ρc. g. 1/3 Vb
= 800. 10. 1/3. (mb/ρb)
= 800.10.1/3. 6/2400
= 6,67N
c. Wc (1/3 bag) = Wu - Fa(1/3 bag)
= 60-6,67
= 53,33 N