From a circular disc of radius 4R, two smaller discs each of radius R are removed (as shown in the figure). Find the position of the centre of mass of the remaining structure.

i*R/5 + j*R/5
-i*R/5 + j*R/5
-3R/14 * (i + j)
None of these

Correct answer: None of these

Solution

Because the exact hole positions depend on the figure, the standard computed shift does not match the listed coordinate options, so the answer is None of these.

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