Ameter stick is balanced at the 50 cm mark. you tie 70 n weight at the 30 cm mark. what weight at the 90 cm mark would create a rotational equilibrium?

b.

explanation:

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.