Aphysics student rests her backpack upon his shoulder. the backpack is suspended motionless by one strap from one shoulder. which free-body diagram best represents this situation?

magnitude and direction

uranium fissions/breaks up giving out energy and neutrons

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.