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HomePhysicsA circular disc of radius R and thickness R/6  has moment of inertia I about an axis passing through its centre and perpendicular to its plane.  It is melted and recasted into a solid sphere.  The moment of inertia of the sphere about its diameter as axis of rotation is

A circular disc of radius R and thickness R/6  has moment of inertia I about an axis passing through its centre and perpendicular to its plane.  It is melted and recasted into a solid sphere.  The moment of inertia of the sphere about its diameter as axis of rotation is

(a)    I

(b)  2I/8

(c)   I/5

(d)   I/10

Ans. c

(7)

5/5 - (1 vote)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (126)

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