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Twenty seven solid iron spheres, each of...

Twenty seven solid iron spheres, each of radius r and surface area S are melted to form a sphere with surface area S'. Find the radius r' area of the new sphere.

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MBD-Surface Areas and Volumes-Exercise
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  5. A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. ...

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  6. Find the volume of a sphere of radius 4 cm.

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  7. Find the volume of a sphere whose radius is : 3.5 cm.

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  8. Find the volume of a sphere whose radius is : 14 dm.

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  9. A hemispherical bowl has inner diameter 11.2 cm. Find the volume of th...

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  10. If S denotes the surface area and V the volume of the sphere, then sho...

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  11. The surface area of a sphere is 1386 cm^2. Find its volume.

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  12. The diameter of a copper sphere is 6 cm. It is beaten and drawn into a...

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  13. A hemispherical bowl is made of steel 0.25 cm thick. The inner radius ...

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  14. Find the volume and total surface area of a soild in the form of a rig...

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  15. A sphere of diameter 6 cm is dropped into a cylindrical vessel partly ...

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  16. A spherical balloon grows to twice its radius when inflated. How has i...

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  17. The diamater of a shot-put made of brass is 14 cm. If 1 cm^3 of brass ...

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  18. How many lead shots each 0.3 cm in diameter be can made from a cuboid ...

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  19. A copper wire 36m long with diameter 2 mm is melted to form a sphere. ...

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  20. A copper wire 36m long with diameter 2 mm is melted to form a sphere. ...

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