Gravitation Tes...

The centers of two bowling balls are $$2.0\,m$$ apart. The mass of one bowling ball is $$5.0\ Kg$$. The mass of the other is $$6.0\ kg$$. How much gravitational force do they exert on each other?
The universal gravitational constant is: $$6.67 \ \times \,10^{-11}\,\dfrac{N.\,m^2}{Kg^2}$$

The distance between the two point masses $$m_1$$ and $$m_2$$ is d. Now, the distance between them is reduced by two-thirds, Calculate by which factor new gravitational force would be change?

Mass differs from weight in which way?

Relative density of a body with respect to  a medium of density $$\rho_1$$ is $$a$$. What is the relative density of the body with respect to a medium of density $$\rho_2$$?

The pair of physical quantities having the same unit is

Four different pairs of people stand in the same park. The tables show the weight of each person, along with the distance between their centers of mass. Which pair has the strongest attraction for each other (gravitationally)?

On the earth, a Sumo of 420 kg is checking his reading on a spring balance. To have the same reading of spring balance on the moon, how many Sumos of mass 420 kg each should stand on it. Explain. (g = 30 m s$$^{-2}$$)

Find the gravitational attraction between two atoms in a hydrogen molecule when $$G$$ is $$6.67\times { 10 }^{ -11 }N{ m }^{ 2 }{ kg }^{ -2 }$$, mass of a hydrogen atom is $$1.67\times { 10 }^{ -27 }kg$$ and the distance between two atoms is $$1\mathring { A } $$.

From a place where, g = 9.8 m $$s^{-2}$$, a stone is thrown upwards with a velocity of 4.9 m $$s^{-1}$$. The time taken by the stone to return to the earth is :