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Question

A conical vessel of radius 6 cm and height 8 cm is completely filled with water. A sphere is lowered into the water and its size is such that when it touches the sides, it is just immersed. What fraction of water overflows?

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Solution

Radius of the conical vessel, R = AC = 6 cm.

Height of the conical vessel, H = OC = 8 cm.

Let the radius of the sphere be r.

Then, PC = PD = r.

Now, AC = AD = 6 cm.

[Since lengths of two tangents from an external point to a circle are equal]

OA=OC2+AC2=82+62=100=10cm

OD= (OA - AD) = (10 - 6) cm = 4 cm.

OP = (OC - PC) = (8 - r).

In right angled ΔODP, we have:

OP2=OD2+PD2

(8r)2=42+r2

6416r+r2=16+r2

16r=48r=3.

Volume of water overflown = Volume of sphere
=43πr3=[43π×(3)3]cm3=(36π)cm3 .

Volume of water in the cone before immersing the sphere = volume of cone
=13πr2h=(13π×(6)2×8)cm3=(96π)cm3


Fraction of water overflown = Volume of water overflownOriginal volume of water

Fraction of water overflown =36π96π=38


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