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Five uniform circular plates, each of di...

Five uniform circular plates, each of diameter `D` and mass `m` are laid out in a pattern shown. Using the origin shown, find the `y` co-ordinate of the centre of mass of the five-plate system.
.

A

`2D//5`

B

`4D//5`

C

`D//3`

D

`D//5`

Text Solution

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The correct Answer is:
B
Ans.(2)
`y_(cm)=(summ_(i)y_(i))/(summ_(i))=(mxx0+mxxD+mxx2D+mxxD+mxx0)/(m+m+m+m+m)=(4D)/(5)`
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