Example 11 - Chapter 11 Class 9 Surface Areas and Volumes

Last updated at April 16, 2024 by

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Example 11 : 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 r3 = 4/3 22/7 4.9 4.9 4.9 cm3 = 493.0053 cm3 = 493 cm3 (approx) Now, Density = / 7.8 = /493 /493 = 7.8 Mass = 7.8 493 g Mass = 3845.44 g

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science and Computer Science at Teachoo