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Deepak Bora
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Asked: 2020-08-09T20:17:36+05:30 In:

A spherical cannon ball, 28 cm in diameter, is melted and recast into a right circular conical mould with base diameter of 35 cm. Find the height of the cone.

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This question was asked in 2001 cbse board exam. Question from RS Aggarwal book chapter volume and surface area of solid, page number 810, exercise 17B, problem number 10

cbse class 10thexercise 17bncert class 10thrs aggarwalvolume and surface area of solid
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    1 Answer

    1. Newbie

      Given data,

      Diameter of cannon ball = 28 cm

      Radius of the cannon ball = 14 cm

      Let h be the height of cone.

      Then

      volume of conical mould = volume of spherical cannon ball

      1/3π(35/2)2 h = 4/3π(14)3

      ∴ h = 4 × 14 × 14 × 14 × 2 × 2/35 × 35

      = 896/25

      = 35.84 cm.

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