A rigid body rotates about a fixed axis with variable angular velocity equal to $(\alpha \,-\,\beta t)$ at time $t,$ where $\alpha $ and $\beta $ are constants. The angle through which it rotates before it comes to rest is
$\frac {\alpha ^2}{2\beta }$
$\frac{{{\alpha ^2} - {\beta ^2}}}{{2\alpha }}$
$\frac{{{\alpha ^2} - {\beta ^2}}}{{2\beta }}$
$\frac{{\alpha (\alpha - \beta )}}{2}$
A $T$ shaped object with dimensions shown in the figure, is lying a smooth floor. A force $'\vec F'$ is applied at the point $P$ parallel to $AB,$ such that the object has only the translational motion without rotation. Find the location of $P$ with respect to $C$
Two points of a rigid body are moving as shown. The angular velocity of the body is: ?
If a solid sphere is rolling the ratio of its rotational energy to the total kinetic energy is given by
A massless string is wrapped round a disc of mass $M$ and radius $R$. Another end is tied to a mass $m$ which is initially at height $h$ from ground level as shown in the fig. If the mass is released then its velocity while touching the ground level will be
If the angular velocity of a merry-go-round is $60^o/sec$ and you are $3.5\,m$ from the centre of rotation, your linear velocity will be