The radius of the Earth may be taken to be 6,371 km. Assume a satellite is in orbit at an
altitude he above the Earth, so R =
6,371+he km. If the period of the orbit of the
satellite around the Earth is 90.0 min, what is
the altitude, he, of the satellite (km)?
he = [ ? ] km
Hint: The acceleration of gravity near the
surface of the Earth is g = 9.80 m/s2.

i think the answer is a, hope this is right, that would be my best guess.

b.

hope this : )

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.