Question

radius of an iron sphere is .21 cm.if dencity of iron is 7.8 g/cm2.calculate its mass.

Answer 1

R= 0.21 cm 
density (d)= 7.80 g /cm²
mass of iron (m) =?
 we know that ,
                         mass = volume × density
  m= 4/3 π r³ × 7.80 
m = 4/3 × 22/7 × (0.21)³ × 7.80 
m = 0.303 g ..
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Answer 2

radius=21cm
density=7.8g/cm2
mass=????

mass = volume×density
vol.=4/3PIr^3
vol.=4/3×22/7×0.21^3
vol.=0.038808cm^3

mass=0.038808×7.8
mass=0.3027g

round off
mass=0.303g

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hope it's correct
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