Two planets, A and B are orbiting a common star in circular orbits of radii $R_{A}$ and $R_{B}$, respectively, with $R_{B}=2 R_{A}$. The planet $B$...

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The kinetic energy needed...

A particle is released from height S above the surface of the earth. At certain height its kinetic energy is three times its potential energy....

Earth has mass 8 times and radius 2 times that of a planet. If the escape velocity from the earth is $11.2 \mathrm{~km} / \mathrm{s}$,...

Acceleration due to gravity on the surface of earth is ' $g$ '. If the diameter of earth is reduced to one third of its...

A satellite of mass $\frac{M}{2}$ is revolving around earth in a circular orbit at a height of $\frac{R}{3}$ from earth surface. The angular momentum of...

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason(R).
Assertion (A) : Time period of...

A satellite is launched into a circular orbit of radius 'R' around the earth. A second satellite is launched into an orbit of radius 1.03...

A positive ion A and a negative ion B has charges $6.67\times {{10}^{{-19}}}\text{C}$ and $9.6\times {{10}^{{-10}}}\text{C}$, and masses $19.2\times {{10}^{{-27}}}~\text{kg}$ and $9\times {{10}^{{-27}}}~\text{kg}$ respectively. At...

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): A simple pendulum is...