What is the gravitational force between two 10 kg iron balls separated by a distance of 0.1 m?

Gravitational force,    

Explanation:

Masses of two iron balls, m₁ = m₂ = 10 kg

Distance between balls, d = 0.1 m

We need to find the gravitational force between two balls. It is given by :

Hence, this is the required solution.

there is no correct list among the choices you've provided.

the list might look something like this:

-- baby human

-- piccolo

-- flute

-- soprano singer

-- trumpet

-- tenor singer

-- trombone

-- baritone singer

-- baritone horn

-- bass singer

-- tuba

since i had to make up the list myself, i made it easy on myself, and i didn't try to shuffle the string instruments and woodwinds into it too.