Two disks with the same rotational inertia i are spinning about the same frictionless shaft, with the same angular speed ω, but with opposite angular velocities ~ω and −~ω. what is the total rotational kinetic energy kr of this system of two disks? 1. 1 2 i ω 2 2. zero 3. none of these

3. none of these

Explanation:

The rotational kinetic energy of an object is given by:

where

I is the moment of inertia

is the angular speed

In this problem, we have two objects rotating, so the total rotational kinetic energy will be the sum of the rotational energies of each object.

For disk 1:

For disk 2:

so the total energy is

So, none of the options is correct.

ill do it for 100, also this isnt 80 its 40