Calculate the volume of a hemisphere with radius $3.1 \mathrm{cm}$ .        [Enter the value excluding units and up to three significant figures]

The volume of iron sphere and the volume of cylinder are numerically the same. Their radii are also the same. 

$\therefore$The height of cylinder$=$_____$\times \mathrm{radius}$

The volume of sphere is $288\pi c{m}^3$. The radius of the sphere is 

The volume of a solid hemisphere is $144\mathrm{\pi } \mathrm{cubic} \mathrm{cm}$, then find the diameter of the sphere.

If the diameter of sphere is $12 cm$, then find the surface area and volume of the sphere.

Radius of a cylinder is equal to its height. If the radius is taken as ‘$r$’, the volume of the cylinder is $\mathrm{\pi }{r}^2\times r=\mathrm{\pi }{r}^3$. Like this find the volumes of the solids, with the following measures.

What is the ratio of the volumes of the cone, hemisphere, cylinder and the sphere?

By melting a solid cylinder of radius 3 cm and height 20 cm, five spherical balls each of same size are formed. Find the radius of each ball. 

(A) 2 cm

(B) 3 cm 

(C) 4 cm 

(D) 5 cm