The temperature gradient at the earths surfae is `32^@C//km`, and earth has average thermal conductivity of 0.008 CGS unit. R = 6000 km (radius of earth). Then what will be the loss of heat from earths surface?

The ratio of the mass of the moon to that of the earth is 1:81. If the radius of the moon is assumed to be one-fourth of that of the earth , then what is the acceleration due to gravity on the surface of the moon in terms of that on the earth's surface ? Hence, find the escape velocity from the surface of the moon in terms of that from the earth's surface.

If the radius of the earth is R, what will be the distance of a geostationary satellite from the centre of the earth ?

Gravitational acceleration on the surface of a planet is (sqrt(6)//11) g, where g is the gravitational acceleration on the surface of the earth. The average mass density of the planet is 2/3 times that of the earth. If the escape speed on the surface of the earth is taken to be 11 km*s^(-1) , the escape speed on the surface of the planet in km*s^(-1) will be

The acceleration due to gravity at a height R ( radius of the earth ) from the earth' s surface is

A person ascends vertically from the earth's surface to a height which is the same as the earth's radius. Then he descends to the centre of the earth. What will be the weight of the person with respect to his weight on the earth's surface in each case ?

The average distance of the sun from the earth is 1.5xx10^8 km and the average distance of the moon from the earth is 384000 km. if the attraction of the sun on the earth is 180 times the attraction of the moon ,how many times is the mass of the sun greater than that of the moon ?

If g is the acceleration due to gravity on the surface of the earth , the gain in potential energy of an object of mass m raised from the earth's surface to a height equal to the radius R of the earth is

The radius of the earth = R. if a geostationary satellite is revolving along a circular path at an altitude of 6R above the surface of the earth, what will be the time period of revolution of another satellite revolving around the earth at an altitude of 2.5R ?