- #1

Neon32

- 68

- 1

## Homework Statement

## Homework Equations

Total energy = Translational kinetic energy + Rotational kinetic energy

Total energy= 1/2 m V

^{2}+ 1/2 I W

^{2}

## The Attempt at a Solution

W= v/r = 3.20/0.100 = 32 rad/sec

Total energy= 1/2 m V

^{2}+ 1/2 I W[

^{2}

Total energy = 1/2 (8)(3.20)

^{2}+ 1/2 (1.60x10

^{-2}) (32)

^{2}=49.152 Joule

I found a different answer in solution. Why did he find the moment of inerta? it was already given in the problem + why didn't he square the angular velocity? Please tell me why he did that and if my answer or his answer is correct.