A circular disc of radius b has a hole of radius a at its centre (see

1.	A circular disc of radius b has a hole of radius a at its centre (see figure). If the mass per unit area of the disc varies as (σ₀/r) then the radius of gyration of the disc about its axis passing through the centre is :(A) (a + b)/3(B) √[(a² + b² + ab)/3](C) (a + b)/2(D)√[(a² + b² + ab)/2]
Answer» ANSWER: SORRY I don't KNOW because I am in CLASS 5

A circular disc of radius b has a hole of radius a at its centre (see figure). If the mass per unit area of the disc varies as (σ₀/r) then the radius of gyration of the disc about its axis passing through the centre is :(A) (a + b)/3(B) √[(a² + b² + ab)/3](C) (a + b)/2(D)√[(a² + b² + ab)/2]

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ANSWER:

SORRY I don't KNOW because I am in CLASS 5

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