Gravitation Tes...

A particle hanging from a massless spring stretch it by $$2 cm$$ at earths surface. How much will the same particle stretch the spring at height $$2624 km$$ from the surface of earth $$?$$ (radius of earth 6400 km)

The magnitude of gravitational potential at a distance $$\frac {a}{2}$$ from the center

A body of mass 2 kg is thrown into space with escape velocity 11.2 km/s, the escape velocity for another body of mass 5 kg will be

At what height $$h$$ above the earth surface, the value of $$g$$ becomes $$\dfrac{g}{2}$$? (where $$R$$ is the radius of the earth)

A man in a balloon rising vertically with an acceleration of $$4.9m/sec^2$$ releases a ball $$2$$ sec after the balloon is let go from the ground. The greatest height above the ground reaches by the ball is $$(g=9.8m/sec^2)$$  

The height at which the acceleration due to gravity becomes $$g/9$$ (where $$g=$$ the acceleration due to gravity on the surface of the earth) in terms of $$R$$, (the radius of the earth) is:-

If retardation produced by air resistance of air resistance is one - tenth of acceleration due to gravity. the time to reach maximum height.

A body weighs W newton at the surface of the earth. Its weight at a height equal to half the radius of the earth will be:

A body weighted 980 N on the surface of the earth. It weight half way down to the centre of the earth is (Assume earth to be of uniform density)

A man weights 100 kgf on the surface of earth. At what height above the surface of earth his weight will be 50 kgf? [where R is radius of the earth]