Aweightlifter’s barbell consists of two 25-kg masses on the ends of a 15-kg rod 1.6 m long. the weightlifter holds the rod at its center and spins it at 10 rpm about an axis perpendicular to the rod. what’s the magnitude of the barbell’s angular momentum?

The angular momentum is

So, we need to find the moment of inertia of the barbell.

The barbell consist of three parts, two masses of 25 kg and a rod of 15 kg.

The moment of inertia of the barbell can be found by summing the moment of inertia of the rod and two masses.

We need to convert 10 rpm to rad/s.

The angular momentum can now be calculated.

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.