Radius of iron sphere is 0.21 cm. The density of iron is 7.8g/cm find mass
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volume of sphere = 4/3 pi r^3
= 4/3 x 22/7 x (21/100)^3 = 0.09 cm^3
mass = volume x density
=0.09 x 7.8 = 0.7 g
= 4/3 x 22/7 x (21/100)^3 = 0.09 cm^3
mass = volume x density
=0.09 x 7.8 = 0.7 g
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