Gravitation Tes...

If the ratio of the masses of two planets is $8 : 3$ and the ratio of their diameters is $2 : 3$, then what will be the ratio of their acceleration due to gravity?

The density of ice, if density of water is $1 g/cm^3$ and relative density of ice is $0.92$, will be:

A ball is dropped from the top of building. The ball takes $0.5s$ to fall post the $3m$ length of window some distance from the top of the building. If the velocity of the ball at the top and at the bottom of the window are $V_T$ and $V_B$ respectively, then

A point P lies on the axis of a ring of mass M and radius a, at a distance a from its centre C. A small particle starts from P and reaches C under gravitational attraction only. Its speed at C will be 

A body weight $700 \ g-wt$ on the earth. How much will it weigh will it weight on the surface of a planet whose mass is $\dfrac{1}{7}$th and radius is half that of the earth

The maximum height from which a person can safely jump is 2.45 m. What is the maximum allowable landing speed for a parachutist?

A body has a weight $90\ N$ on the earth's surface. The mass of the moon is $\dfrac{1}{9}$ that of the earth's mass and its radius is $\dfrac{1}{2}$ that of the earth's radius. On the moon, the weight of the body is :

Who among the following did first give the experimental value of $G$?

A small spherical ball of radius $r$ falls freely under gravity through a distance of $h$ before entering a tank of water. If, after entering the water, the velocity of the ball does not change, then $h$ is proportional

A solid sphere of mass M and radius R is surrounded by a spherical shell of same mass M and radius 2R as shown. A small particle of mass m is released from rest from a height h (<<R) above the shell. There is a hole in the shell. 
In what time will it enter the hole at A :-