Questions
Circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4 R is made from an iron plate of thickness..Then, the relation between the moment of inertia IX, and Iy is
detailed solution
Correct option is A
The mass of the disc = Volume x density =πR2t×ρFor disc X,IX=12M1R12 =12πR4tρFor disc Y,IY=12π(4R)2t4ρ(4R)2 =32πR4tρ∴ IY=64IXTalk to our academic expert!
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If a disc of mass m and radius r is reshaped into a ring of radius 2r, the mass remaining the same, the radius of gyration about centroidal axis perpendicular to plane goes up by a factor of
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