Physics System of Particles and Rotational Motion

A thin rod of mass 0.9 kg and length 1 m is suspended, at rest, from one end so that in can freely oscillate in the vertical plane. A particle of move 0.1 kg moving in a straight line with velocity 80 m/s hits the rod at its bottom most point and sticks to it (see figure). The angular speed (in rad/s) of the rod immediately after the collision will be 

Consider a uniform rod of mass $\mathrm{M}=4\mathrm{m}$ $$ and length $\mathcal{l}$ $$ pivoted about its centre. A mass $\mathrm{m}$ $$ moving with velocity $v$ $$ making angle $\theta =\frac{\pi }{4}$ $\frac{}{}$ to the rod's long axis collides with one end the rod and sticks to it. The angular sped of the rod-mass system just after the collision is

As shown in the figure, $a$ $$ bob of mass $m$ $$ is tied by $a$ $$ massless string whose other end portion is wound on a fly wheel (disc) of radius $r$ $$ and mass $$ $m$ . When released from rest the bob starts falling vertically. When it has covered a distance of $h$ $$ , the angular speed of the wheel will be

Three point particles of masses $10\mathrm{k}\mathrm{g},1.5\mathrm{k}\mathrm{g}$ $$ and $$ $2.5\mathrm{k}\mathrm{g}$ are placed at there corners of a right angle triangle of sides $4.0\mathrm{c}\mathrm{m},3.0;\mathrm{c}\mathrm{m}$ $$ and $$ $5.0\mathrm{c}\mathrm{m}$ as shown in the figure. The centre of mass of the system is at a point:

The radius of gyration of a uniform rod of length $$ $\mathcal{l}$ , about an axis passing through a point $\frac{\mathcal{l}}{4}$ $\frac{}{}$ away from the centre of the rod, an perpendicular to it is:

The coordinates of centre of mass of a uniform flag shaped lamina (thin flat plate) of mass 4 $\mathrm{k}\mathrm{g}$ . (the coordinates of the same are shown in figure) are:

Mass per unit are of a circular disc of radius a depends on the distance $r$ from its centre as $\sigma \left(r\right)=\mathrm{A}+\mathrm{B}\mathrm{r}$ . The moment of inertia of the disc about the axis, perpendicular to the plane and passing through its centre is:

Consider a 20 kg uniform circular disk of radius 0.2 m. It is pin supported at its centre and is at rest initially. The disk is acted upon by a constant force F = 20 N through a massless string wrapped around its periphery as shown in the figure. Suppose the disk makes n number of revolutions to attain an angular speed of 50 rad s-1. The value of n, to the nearest integer, is ---------.

[Given : In one complete revolution, the disk rotates by 6.28 rad ]

Four equal masses, m each are placed at the corners of a square of length l as shown in the figure. The moment of inertia of the system about an axis passing through A and parallel to DB would be :

A body of mass 2 kg moving with a speed of 4 m/s, makes an elastic collision with another body at rest and continues to move in the original direction but with one fourth of its initial speed. The speed of the two body centre of mass is x/10 m/s. Then the value of x is _______ .