Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth `= 6 xx 10^24` kg and mass of the Sun `= 2 xx 10^30kg`. The average distance between the two is `1.5 xx 10^11 m`.

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 x 10^24 kg and radius of the earth 6.4 x 10^6 m.)

A rocket is fired from the earth towards the sun. At what distance form the earth's centre is the gravitational force on the rocket zero? Mass of the sun = 2 xx 10^20 kg and mass of earth = 6 xx 10^24 kg and orbital radius 1.5 xx 10^-8 km.

A saturn year is 29.3 times the earth year. How far is the saturn from the sun if the earth's 1.5 xx 10^8 km away from the sun.

Calculate the rotation kinetic energy of the earth about its own axis. (M= 6 times 10^24 kg and R = 6400km)

Calculate the energy of a photon of wavelength 6 xx 10^(-5) cm.

Calculate the de-Broglie wave length of a Xe atom moving with velocity 2.4xx10^2ms^-1 the mass of Xe atom is 2.2xx10^(-25) kg .

The orbital radius of earth in 1.49 xx 10^13 cm. Calculate the mass of sun.

A satellite orbits the earth at a height of 400 km above the surface. How much energy must be expended to rocket the satellite out of the earth’s gravitational influence? Mass of the satellite = 200 kg, mass of the earth = 6.0 xx10^24 kg, radius of the earth = 6.4 xx10^6 m, G = 6.67 x 10^-11 N m^2 kg ^-2 .

A spaceship is stationed on Wlars. How much energy must be expended on the spaceship to launch it out of the solar system? Mass of the space ship = 1000 kg, mass of the Sun = 2 xx 10^30 kg, mass of mars = 6.4 xx-10^23 kg, radius of mars = 3395 km, radius of the orbit of mars = 2.28 x 10^8 kg, G= 6.67 xx 10^-11 m^2kg-^2 .