The centre of mass of a semi-circular ring lies 5cm above the centre of the semi-circle. What is the circumference of the ring?
A
20.67cm
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B
27.48cm
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C
24.67cm
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D
18.56cm
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Solution
The correct option is C24.67cm YCOM of a semi circular ring is at a distance of 2Rπ from the centre. ∴YCOM=2Rπ=5 ⇒R=5π2=7.85cm
Circumference of the ring =πR =24.67cm