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A body weighs $72N$ on the surface of the earth. What is the gravitational force on it, at a height equal to half the radius of the earth ?

A body weighs 200 N on the surface of the earth. How much it weigh half way down to the centre of the earth ?

If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?

At what temperature will the rms speed of oxygen molecules become just sufficient for escaping from the Earth's atmosphere?(Given: Mass of oxygen molecule(m)$=2.76×10_{−26}$kg

Boltzmann's constant $k_{B}=1.38×10_{−23}JK_{−1}$)

Boltzmann's constant $k_{B}=1.38×10_{−23}JK_{−1}$)

The acceleration due to gravity at a height 1 km above the earth is the same as at a depth d below the surface of earth. Then:

A body of mass 'm' is taken from the earth's surface to the height equal to twice the radius (R) of the earth. The change in potential energy of body will be -

Infinite number of bodies, each of mass 2 kg are situated on x-axis at distances 1m, 2m, 4m, 8m, , respectively, from the origin. The resulting gravitational potential due to this system at the origin will be -