The gravitational force between the sun and Jupiter is approximately $4\times {\text{10}}^{23}\text{\hspace{0.17em}N}$. If mass of sun $1.99\times {\text{10}}^{30}\text{\hspace{0.17em}kg}$, the mean distance of the Jupiter from the sun is $d=7.8\times {\text{10}}^{11}\text{\hspace{0.17em}m}$, find the mass of jupiter. 

What is the nature of the force which keeps a satellite revolving around the earth?

What is wrong in the figure? Given $F_A$ and $F_B$, are gravitational pull of the earth on persons A and B respectively.

The value of $g$ at the centre of the Earth is _____.

(Choose from: infinity/ zero)