Question

density of alcoh
A piece of iron weighs 155 gf in air and 133 gf in
water. What is its volume and the relative density of
the iron? What would be the same piece of iron
appear to weigh in alcohol of density 0.8 gcm?
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Answer 1

Answer:

weight in air =44.5gf=0.445gN

weight in water =39.5gf=0.395gN

volume of the iron =Vi

density of the iron =d

density of the iron =dVi×dg=0.445g

density of the iron =dVi×dg=0.445g⇒Vi×d=0.445

density of the iron =dVi×dg=0.445g⇒Vi×d=0.445density of water =1000kg/m3

Vi×1000×g=0.445g−0.395g

⇒1000V=0.05

⇒1000V=0.05⇒V=0.00005

⇒1000V=0.05⇒V=0.00005d=0.445/0.00005 

DENSITY OF IRON: 8900kg/m3=8.9g/cm3