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Question

A vessel in the shape of a cuboid contains some water. If three identical spheres are immersed in the water, the level of water is increased by 2 cm. If the area of the base of the cuboid is 160 cm2 and its height 12 cm, determine the radius of any of the spheres.

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Solution

Area of the base of the cuboid = 160 cm²
Let the radius of the sphere be r cm.
Volume of three spheres =4πr3 [3 times volume of single sphere]
Increased height of the cuboidal vessel = 2 cm
Increased volume of the water =160×2=320 cm3
Since the volume is increased after immersing the 3 spheres in the vessel, increased volume of water will be equal to the volume of three spheres.

=>4πr3=320

=>r3=25.45

=>r=2.94 cm

Thus, the radius of the spheres is 2.94 cm.


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