Solve the following examples / numerical problems:
Find the magnitude of the acceleration due to gravity at the surface of the earth. ( M= 6xx 10^24 kg, R= 6400 km)

Solve the following examples / numerical problems: Find the magnitude of the gravitational force between the Sun and the earth.( Mass of the Sun =2xx10^30 kg, mass of the earth = 6xx10^24 kg and the distance between the centres of the Sun and the earth = 1.5xx 10^11 m, G =6.67 xx10^-11 N-m^2 /kg^2 ).

Solve the following examples / numerical problems: If the acceleration due to gravity on the surface of the earth is 9.8 m/s^2, what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth ?

Solve the following examples / numerical problems: Find the escape velocity of a body from the earth. [M_(earth)= 6xx10^24 kg, R_(earth)=6.4xx10^6m,G=6.67xx10^-11 N-m^2/kg^2]

Calculate the acceleration due to gravity at a height of 300 km from the surface of the Earth

Solve the following examples / numerical problems: If the weight of a body on the surface of the moon is 100 N , what is its mass ?

Solve the following examples/numerical problems : Calculate the critical velocity (Vc) of the satellite to be located at 2000 km above the surface of the earth?

Derive an expression for critical velocity of satellite. Calculate the acceleration due to gravity at a height of 300 km from the surface of the earth. M = 6xx10^24kg R = 6400 km.

Solve the following examples/numerical problems : Calculate the critical velocity (Vc) of the satellite to be located at 35780 km above the surface of the earth .