Gravitation Tes...

A man weighs $80$kg on the surface of earth of radius R. At what height above the surface of earth his weight will be $40$kg?

A planet is revolving in an elliptical orbit around the Sun. Its closest distance from the Sun is $r_{min}$ and the farthest distance is $r_{max}$. If the velocity of the planet at the distance of the closest approach is $v_1$ and that at the farthest distance from the Sun is $v_2$, then $v_1/v_2$.

Net torque on the planet is

Two identical particles of mass $m$ are placed at a distance $r$ from each other. If their separation is doubled, then the effect on gravitational constant will be 

The value of universal gravitational constant on earth for a particle of mass 5 kg is 

Velocity of the planet is minimum at

If the gravitational constant is expressed in terms of $dynes\ m^{-2} kg^{2}$, how will the value of G change:

A spring balance is graduated on sea level. If a body of mass 5 kg is weighed with this balance and the balance is taken to a height of 360kms and the object is weighed again, then the weight of the object

At what height over the earths pole, the free fall acceleration decreases by one percent (assume the radius of earth to be 6400 km)            

Which of the following laws are conserved, if the areal acceleration is zero