We have two spheres, one of which is hollow shell and the other solid. They have identical masses and moment of inertia about their respective diameters. The ratio of their radius is given by
$5 : 7$
$3 : 5$
$\sqrt 5 :\sqrt 3 $
$\sqrt 3 :\sqrt 7 $
Four particles of masses $1\,kg, 2 \,kg, 3 \,kg$ and $4\, kg$ are placed at the four vertices $A, B, C$ and $D$ of a square of side $1\, m$. The coordinates of centre of mass of the particles are
Two particles which are initially at rest, move towards each other under the action of their internal attraction. If their speeds are $v$ and $2v$ at any instant, then the speed of centre of mass of the system will be
The instantaneous angular position of a point on a rotating wheel is given by the equation $\theta (t) = 2t^3 -6t^2$. The torque on the wheel becomes zero at $t$ $=$ ........ $\sec.$
Which vector in the figures best represents the acceleration of a pendulum mass at the intermediate point in its swing?
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