A solid is composed of a cylinder with hemispherical ends if whole length of the solid is 108 cm and the diameter of the hemispherical ends is 36 cm find the cost of polishing its surface at the rate of 70 paise per square cm
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Q :- A solid is composed of a cylinder with hemispherical ends if whole length of the solid is 108 cm and the diameter of the hemispherical ends is 36 cm find the cost of polishing its surface at the rate of 70 paise per square cm.
A :- Radius of hemisphere=36/2=18
In the given solid height of cylinder = 108 - 2{radius of hemisphere}
= 108 - 18 = 90
CSA of the solid = CSA of cylinder + CSA of both hemispheres
= 2*22/7*18*90 + 2 (2*22/7*18*18) = 14256 cm^2
Cost = 14256 *70 = Rs 9980
Q :- A solid is composed of a cylinder with hemispherical ends if whole length of the solid is 108 cm and the diameter of the hemispherical ends is 36 cm find the cost of polishing its surface at the rate of 70 paise per square cm.
A :- Radius of hemisphere=36/2=18
In the given solid height of cylinder = 108 - 2{radius of hemisphere}
= 108 - 18 = 90
CSA of the solid = CSA of cylinder + CSA of both hemispheres
= 2*22/7*18*90 + 2 (2*22/7*18*18) = 14256 cm^2
Cost = 14256 *70 = Rs 9980
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