A planet revolves around a massive star in the elliptical orbit shown. Point A on the orbit corresponds to perigee. Consider motion of the planet from position P to position Q. About A, angular momentum of the planet

The correct match is

Two thin circular discs of mass $m$ and $4m$, having radii of $a$ and $2a$, respectively, are rigidly fixed by a massless, right rod of length $\mathcal{l}=\sqrt{24}a$ through their center. This assembly is laid on a firm and flat surface, and set rolling without slipping on the surface so that the angular speed about the axis of the rod is $\omega$ . The angular momentum of the entire assembly about the point $O$ is $\overrightarrow{L}$ (see the figure). Which of the following statement(s) is(are) true?

(A) Ratio of the relative strength of gravitational to weak force is nearly ${10}^{-3}$
(B) Ratio of the relative strength of gravitational to weak force is less than ${10}^{-3}$
(C) Ratio of the relative strength of strong nuclear to electromagnetic force is nearly ${10}^2$
(D) Ratio of the relative strength of strong nuclear to electromagnetic force is nearly ${10}^{-2}$.

Which of the following is true?

A particle is moving uniformly along a straight line as shown in the figure. During the motion of the particle from $A$ to $B$, the angular momentum of the particle about ${}^{\text{'}}O^{\text{'}}$

A particle of mass $2 \mathrm{kg}$ is on a smooth horizontal table and moves in a circular path of radius $0.6 \mathrm{m}$. The height of the table from the ground is $0.8 \mathrm{m}$. If the angular speed of the particle is $12\mathrm{ }\mathrm{rad}\mathrm{ }{\mathrm{s}}^{-1}$ , the magnitude of its angular momentum about a point on the ground right under the center of the circle is: