A satellite moving with velocity $v$ in a force free space collects stationary interplanetary dust at a rate of $\frac{{dM}}{{dt}} = \alpha v$ where $M$ is the mass (of satellite + dust) at that instant . The instantaneous acceleration of the satellite is
$ - \frac{{\alpha {v^2}}}{{2M}}$
$ - \frac{{\alpha {v^2}}}{{M}}$
$ - \alpha {v^2}$
$ - \frac{{2\alpha {v^2}}}{{M}}$
At what height above the earth's surface is the value of $'g'$ is same as in a $200\, km$ deep mine ........ $km$
Suppose the gravitational force varies inversely as the nth power of distance. Then the time period of a planet in circular orbit of radius $R$ around the sun will be proportional to
Two masses $m_1$ and $m_2$ start to move towards each other due to mutual gravitational force. If distance covered by $m_1$ is $x$, then the distance covered by $m_2$ is
Two particles of equal mass go round a circle of radius $R$ under the action of their mutual gravitational attraction. The speed of each particle is
When a body is taken from pole to the equator its weight