ABCD is a square whose vertices are A(0, 0), B(2, 0), C(2, 2), and D(0, 2). The square is roated in the XY-plane through and angle `30^(@)` in the anticlockwise sense about an axis passing though A perpendicular to the XY-plane. Find the equation of the diagonal BD of this rotated square.

A B C D is a square whose vertices are A(0,0),B(2,0),C(2,2), and D(0,2) . The square is rotated in the X Y-p l a n e through an angle 30^0 in the anticlockwise sense about an axis passing though A perpendicular to the X Y-p l a n e . Find the equation of the diagonal B D of this rotated square.

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Radius of gyration of a disc of mass 50 g and radius 0.5 cm about an axis passing through its centre of gravity and perpendicular to the plane is

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