Question

What is the gravitational force of attraction between a 55 kg boy and a 40 kg girl if they are 0.10 meters apart?

Answer 1

`1.5\cdot 10^(-5)\:\mathrm{N}`

Step-by-step explanation:

Newton's Law of Gravitation is given as:

`F=G(m_1m_2)/(r^2)`, where
`G` is gravitational constant
`6.67\cdot 10^(-11)` and
`r` is the distance between their centers of mass.

Therefore, the gravitational force between them is:

`F=6.67\cdot 10^(-11)(55\cdot40)/(0.1^2)= \fbox{$1.5\cdot 10^(-5)\:\mathrm{N}$}` (two significant figures).