If the time period is doubled, then the angular momentum of the body will (provided the moment of inertia of the body is constant),

Helium gas goes through a cycle $ABCDA$ (consisting of two isochoric and two isobaric lines) as shown in figure. The efficiency of this cycle is approximately

A spherically symmetric gravitational system of particles has mass density 

$\rho =\left\{\begin{array}{l}{\rho }_0 \mathrm{for} r\le R\\ 0 \mathrm{for} r>R\end{array}\right.$

where, ${\rho }_0$ is a constant. A test mass can undergo circular motion under the influence of the gravitational field of particles. Its speed $v$ as a function of distance $r\left(0<r<\infty \right)$ from the centre of the system is represented by

A particle shows distance-time curve as shown in the figure. The maximum instantaneous velocity of the particle is around which point?