Two lead spheres of `20 cm` and `2 cm` diametre respectively are planet with centres `100 cm` apart. Calculate the attraction between them, given the radius of the Earth as `6.37 xx 10^(8) cm` and its mean density as `5.53 xx 10^(3) kg m^(-3)`. Speciffic gravity of lead `= 11.5`. If the lead spheres are replaced by bress sphere of the same radii, would the force of attraction be the same?

The radius of the earth is 6.37 xx 10^(6) m and its mean density is 5.5 xx 10^(3) "kg m"^(-3) and G = 6.67 xx 10^(-11) "N-m"^(2) kg^(-2) Find the gravitational potential on the surface of the earth.

Two spheres, each of mass 625 kg, are placed with their centres 50 cm apart. The gravitational force between them is

Calculate the acceleration due to gravity on the earth 's surface , given that gravitational constant G = 6.7 xx 10^(-11) SL unit , radius of he earth = 6. 4 xx 10 ^(6) m and mean density of earth = 5.5 xx 10^(3) kg m^(-3) .

The volume of a sphere of radius 10.5 cm is

Three small lead spheres of radii 3 cm, 4 cm and 5 cm respectively, are melted into a single sphere. The diameter of the new sphere is

Two brass spheres of diameter 10 cm and 1 cm are placed with their centres 50 cm apart. If the relative density of brass is 8.5, calculate the gravitational attraction between the spheres. If the brass spheres are replaced by lead spheres (relative density greater than brass) of same radii, will the force of attraction increase or decrease ? For earth Take R = 6.37 xx 10^(8) cm Mean density = 5.53 xx 10^(3) kg m^(-3)

Calculate the force of attraction between a sphere of mass 40 kg and another sphere of mass 80 kg with their centres 30 cm apart.

Metallic spheres of radii 6cm, 8cm and 10cm respectively are melted to form a solid sphere. Find the radius of the resulting sphere.

Metallic spheres of radii 6 cm, 8 cm and 10 cm respectively, are melted to form a single solid sphere. Find the radius of the resulting sphere.