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 :-