Một chất điểm chuyển động tròn đều với chu kì T=5s tốc độ góc có giá trị nào?

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.

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up