Moon revolves round the earth in an orbit of radius `3.8 xx 10^5` km in 27 days. Earth used to involve round the sun in the orbit of radius `1.5 xx 10^8` kms in 365 days. What is the ratio of mass of sun with the mass of earth.

Assuming that the moon moves around the earth in a circular orbit of radius 3.8xx10^5 km in 27 days and the earth moves around the sun in a circular orbit of radius of radius 1.5xx10^8 km in 365 days, find the ratio of the masses of the sun and the earth.

An artificial satellite of mass m is moving round the earth in an orbit of radius 2R. How much work is to be done to transfer the satellite to an orbit of radius 4R ? How will the potential energy of the satellite change ? (R=Radius of earth)

An aritificial satellite of mass m is moving round the earth, in an orbit of radius 2R. How much work is to be done to transfer the satellite to an orbit of radius 4R? How will the potential energy of the satellite change? (R = Radius of earth).

The earth rotates around the sun in a circular orbit of radius R. Calculate the orbital speed of rotation of the earth around the sun. Also find the time period of rotation. Take the mass of the earth =m, mass of the sum =M.

The radius of the first electron orbit of a hydrogen atom is 5.3 xx 10^(-11) m. what is the radius of its second orbit ?

The distance the sun and the earth is 1.5xx10^8 km . At what point on the line joining them, will the gravitational attraction of the sun and that of the earth be equal but opposite ? ( Mass of the sun is 336400 times the mass of the earth )

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 ?

An artificial satellite revolves around the earth in a circular orbit and is at a height of 300 km above the surface of the earth. Find the orbital speed and the time period of the satellite. The radius of the earth=6400 km, g=980 cm*s^(-2) .

Two satellites A and B of the same mass revolve around the earth in circular orbits. They are at heights of R and 3R respectively from the surface of the earth (R=radius of the earth). Find the ratio of their kinetic energies and potential energies.