Question

A solid is composed of a cylinder with hemispherical ends. If the whole length of the solid is 104cm and the radius of each hemispherical end is 7cm find the cost of polishing it's surface at the rate of RS.4 per 100cm3.
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Answer 1

Step-by-step explanation:

Given radius of hemispherical ends = 7cm Height of body (h+2r)= 104cm Curved surface area of cylinder = 2πrh Substitute ‘h’ value in (1) Curved surface area of cylinder = 2π(7)(90) =3948.40cm2 ................(2) Curved surface area of 2 hemisphere = 2(2πr2) Total curved surface area = (2) + (3) Read more on Sarthaks.com solid-composed-of-cylinder-with-hemispherical-ends-if-the-whole-length-of-the-solid-104cm