Home
Class 9
MATHS
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 (i) radius r' of the new sphere, (ii) ratio of S and S'.

Text Solution

Verified by Experts

The correct Answer is:
(i) r. = 3r
(ii) 1:9
Promotional Banner

Topper's Solved these Questions

  • SURFACE AREAS AND VOLUMES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise EXERCISE 13.9 (OPTIONAL)|3 Videos

  • SURFACE AREAS AND VOLUMES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise SKILL TESTING EXERCISE|49 Videos

  • SURFACE AREAS AND VOLUMES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise EXERCISE 13.7|9 Videos

  • PROBABILITY

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise Multiple Choice Questions (MCQs)|10 Videos

  • TRIANGLES

    NAVNEET PUBLICATION - MAHARASHTRA BOARD|Exercise SUMS TO ENRICH REMEMBER|9 Videos

Similar Questions

Explore conceptually related problems

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 (i) radius r' of the new sphere,(ii) ratio of SandS'.

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 of the new sphere.ratio of S and S.

The surface area of a sphere of radius 21 cm is

Find the surface area of a sphere of radius 7 cm.

Find the surface area of sphere if radius is 9cm?

Three solid spheres have their radii r_(1),r_(2) and r_(3) .The spheres are melted to form a solid sphere of bigger radius of the new sphere is:

Find the surface area of a sphere of radius 7cm.

Find the surface area of a sphere of radius 7cm.

Find the surface area of a sphere of radius 14cm.