Gravitation Tes...

The value of $$g$$ at the surface of earth is $$9.8\ m/s^{2}$$ then the value of $$'g'$$ at a place $$480\ km$$ above the surface of the earth will be nearly (radius of the earth is $$6400\ km)$$.

Three particles each of mass $$'m'$$ are at the vertices of an equilateral triangle of side length $$'l'$$. Then the work done is moving one particle to infinity is:

The value of acceleration due to gravity will be $$1\%$$ of its value at the surface of earth at a height of $$(R_{e} = 6400\ km)$$.

The SI unit of the universal gravitational constant G:

At what height from the surface of the earth, the value of g is reduced by 36% from its value at the surface of the earth of radius R=6400 km?

A body weights $$63 N$$ on the surface of the Earth. At a height $$h$$ above the surface of Earth, its weight is $$28 N$$ while at a depth $$h$$ below the surface Earth, the weight is $$31.5 N$$. The value of $$h$$ is:

At what height above the surface of earth the value of "g" decreases by 2%?  [radius of the earth is 6400 km]

The period of a simple pendulum on the surface of earth is $$T$$. At an altitude of half of the radius of earth from the surface, its period will be

At a certain height above the earth's surface, the gravitational acceleration is $$4$$% of its value at the surface of the earth. Find the height. ($$R$$ is the surface of the earth)

A rocket is fired from the earth to the moon. The distance between the earth and the moon is $$r$$ and the mass of the earth is $$81$$ times the mass of the moon. The gravitational force on the rocket will be zero, when its distance from the moon is then