You are designing a rotating metal flywheel that will be used to store energy. the flywheel is to be a uniform disk with radius 27.0 cm . starting from rest at t = 0, the flywheel rotates with constant angular acceleration 3.00 rad/s2 about an axis perpendicular to the flywheel at its center if the flywheel has a density (mass per unit volume) of 8600 kg/m3, what thickness must it have to store 800 j of kinetic energy at t = 8.00 s?

Explanation:

Given:

We know for rotational kinetic energy:

.................................(1)

where:

I = mass moment of inertia for the given mass  geometry

= angular velocity in radians per second,

Here,

∵

Now,

∴Using eq. (1)

which statement about this sum is true? −245+2.7

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.