Gravitation Tes...

Fill in the blank. 

As per the request of one of his friends from equator, Rahul buys 100 gram of silver at the north pole. He hands it over to his friend at the equator. The weight found by friend will be __________  the weight of silver bought.

If the acceleration due to gravity on the surface of the earth is $$9.8\,\,m/s^2$$,  what will be the acceleration due to gravity on the surface of a planet whose mass and radius both are two times the corresponding quantities for the earth ? 

If the weight of a body on the surface of the moon is 100 N, what is its mass? (g =1.6 m$$s^{-2}$$)

Calculate the force of gravitation between the earth and the sun, given that the mass of the earth is $${6\times 10^{24}}\ kg$$ and the sun is $${2\times 10^{30}}\ kg$$. The average distance between the two is $${1.5\times 10^{11}}\ m$$.

Two fishes are $$1 m$$ apart underwater. The gravitational force between them is $${F_1}$$,They jump above the surface of water keeping the same distance (i.e $$1 m$$) between them. The new gravitational force between them is $${F_2}$$. The relationship between $${F_1}$$ and $${F_2}$$ is

_______ of a body changes from place to place but its ______ remains constant.

Gravitational force on the surface of the moon is only $${\frac{1}{6}}$$ as strong as gravitational force on the earth. What is the weight in Newton of a 10 kg object on the moon ?

Is the buoyant force on a submerged object equal to the weight of the object itself or equal to the weight of the fluid displaced by the object?