Example 18 - A shot-putt is a metallic sphere of radius - Examples

  1. Chapter 13 Class 9 Surface Areas and Volumes
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Example 18 : A shot-putt is a metallic sphere of radius 4.9 cm. If the density of the metal is 7.8 g per cm3, find the mass of the shot-putt. To find mass, we have to find volume of sphere Radius of sphere = r = 4.9 cm volume of the sphere = 4/3 πr3 = 4/3 × 22/7 × 4.9 × 4.9 × 4.9 cm3 = 493.0053 cm3 = 493 cm3 (approx) Now, Density = 𝑀𝑎𝑠𝑠/𝑉𝑜𝑙𝑢𝑚𝑒 7.8 = 𝑀𝑎𝑠𝑠/493 𝑀𝑎𝑠𝑠/493 = 7.8 Mass = 7.8 × 493 g Mass = 3845.44 g

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