Find out the centre of gravity of solid sphere, Mechanical Engineering

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Find out the centre of gravity of solid sphere:

Find out the C. G. of a body formed by a solid sphere placed over a solid cylinder of similar radius a as illustrated in Figure, where a = 20 cm.

1870_Find out the centre of gravity of solid sphere.jpg

Solution

Let y axis to be vertically along with the axis of cylinder with centre O of its base as origin.

V1 = Volume of cylinder = π a 2 × 2 a =  2 π a3

V2 = Volume of sphere=(4/3)  π a3

Total volume = V1 + V2 = V (say)

 If G is the centre of gravity of the combined body, then OG =  y¯

V y¯ = V1  y1 + V2  y2

π a3   [2 +  (4/3)]  y¯ = π a3  [2 × a] + π a3 × ((4/3)× 3a)

=  π a3 [2 a + 4 a]

∴ y = 6 a / (2 +  (4 /3)) =     6 a / (10/3)

= 1.8 a


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