Two spheres of masses $m$ and $M$ are situated in air and the gravitational force between them is $F$. The space around the masses is now filled with a liquid of specific gravity $3$. The gravitationalforce will now be
$3F$
$F$
$\frac{F}{3}$
$\frac{F}{9}$
In a satellite if the time of revolution is $T$, then $P E$ is proportional to ..........
A satellite is orbitting around the earth with areal speed $v_a$. At what height from the surface of the earth, it is rotating, if the radius of earth is $R$
A particle of mass $M$ is situated at the centre of a spherical shell of same mass and radius $a$. The gravitational potential at a point situated at $\frac {a}{2}$ distance from the centre, will be
The height at which the weight of a body becomes $1/16^{th}$, its weight on the surface of earth (radius $R$), is
At what height above the earth's surface is the value of $'g'$ is same as in a $200\, km$ deep mine ........ $km$