Given that σij and εij are second order tensors, show that σij=λεkk δij+2μεij is invariant with respect to coordinate rotation.

hotter stars = bluer stars

carla slowed down in the beginning of her trip, stopped, and then sped up

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.