MI OF DISC ABOUT N AXIS PASSING THOUGH CENTRE AND AT RIGHT ANGLES TO ITS PLANE IS 1/2MR SQUARE .FIND MI ABOUT A DIAMETER .WHAT WOULD BE MI ABOUT AN AXIS TANGENTIAL TO AND LYING IN PLANE OF DISC AND PEPENDICULAR TO THE PLANE OF DISC

A wheel is rolling along the ground with a speed of 2 metre per second inverse the magnitude of the velocity of the point at the extreme it's of the horizontal diameter of the wheel is equal to

a 2 root under 10ms-1

b 2 root 3 ms-1

c 2 root 2ms-1

d 2ms-1

What is radii of gyrations

2 disc of same moment of inertia rotating about their regular axis passing through the centre & perpendicular to the plane of disc with a1 &a2. they r bought face to face coincoiding to the axis of rotation . the loss of energy is

(A) I(a1-a2)2

(b) I/8(a1-a2)2

(c) I/2(a1+a2)2

(d) I/4(A1-A2)2

solve this question plz