Question

radius of an iron sphere is 0.21 centimetre. If density of iron is 7.80 clcc calculate its mass

Answer 1

Radius = r = 0.21cm

Density = 7.80 g/ cm³

Volume of a sphere = 4/3πr³
                                = 4/3 × 22/7 × 0.21 × 0.21 × 0.21
                                = 0.38808 cm ³ 

Density = Mass ÷ Volume

Mass = Density × Volume 
          = 7.80 ×  0.38808
          = 3.02 grams [ approx.]

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Answer 2

Radius of iron sphere , r = 0.21 cm;

Density of iron is, d = 7.80g/cc

Mass of the iron sphere, m = ?

Mass = Volume * Density
M =
4
3
πr
3
* 7.80
M =
4
3
* 
22
7
* 
(0.21)
3
* 7.80
M = 0.303 g