Physics Test 18...

A circular disc A of radius r is made from an iron plate of thickness t, and another circular disc B of radius 4r is made from an iron plate of thickness t/4. The relation between the moments of inertia I_A and I_B is

A solid homogeneous sphere is moving on a rough horizontal surface, partly rolling and partly sliding. During this kind of motion of the sphere

A sphere of mass m and radius r rolls on a horizontal plane without slipping with the speed u. Now, if it rolls up vertically, the maximum height it would attain will be

The wheels on the old-time bicycle shown in the diagram have radii of 60.0 cm. and 10.0 cm. If the larger wheel is rotating at 12.0 rad s^-1, what is the angular speed of the smaller wheel?

Angular momentum is conserved

If the earth shrinks such that its mass does not change but radius decreases to one-quarter of its original value then one complete day will take

A solid sphere rolls down two different inclined planes of same height, but of different inclinations. In both cases,

The angular speed of rotating rigid body is increased from 4ω to 5ω keeping moment of inertia constant. The percentage increase in its K.E is -

The radius of a solid sphere is R and its density D. When it is made to rotate about an axis passing through any diameter of sphere, expression for its moment of inertia is

The equation τ = Iα is valid about which of the following?