A solid piece of iron in the form of a cuboid of dimensions (49 cm × 33 cm × 24 cm) is moulded to form a solid sphere. The radius of the sphere is
Given: Dimension of cuboid (49 cm × 33 cm × 24 cm)
Volume of cuboid is : length × breadth × height
Volume of Solid Sphere is : × π × r3 (here r is radius of the sphere)
Let v1 be the volume of given cuboid.
∴ v1 = 49 cm × 33 cm × 24 cm = 38808 cm3
Let v2 be the volume of Solid Sphere.
We know that when a object is moulded from one shape to other its volume does not change.
∴ v1=v2
That is,
38808 = × π × r3
r3 = × 38808
r3 = 9261 r = ∛9261 = 21
∴ r = 21cm
That is, radius of the Solid sphere = 21cm