CBSE Class 11science  Law of Gravitation Videos
Gravitation
This video explains the universal law of gravitation and the acceleration due to gravity.
 Mention the method of determining the mass of planets star etc
 4 identicle bodies of mass m are located at vertices of square of side l they revolve under the effect of mutual gravitational force in circle circumscribing the square then the speed of each body will be
 why the value of g is zero at the centre of the earth

Please give answer
 what is the derivation of formula of gravity
 if acceleration due to gravity g at height h
 what is gravitational force
 SI unit of gravitational force is Nm^{2}kg^{2} OR Nm^{2}kg^{2} ...?
 A planet moves around the earth in nearly circular orbit. Its period of revolution ‘T’ depends upon: (i) radius ‘r’ of the earth (ii) mass ‘m’ of the sun (iii) the gravitational constant ‘G’. Show dimensionally that T2 DIRECTLY PROPORTIONAL TO r3

mm