# Homework Help: Angular Momentum of Earth

1. Nov 17, 2013

### sammythesp3rmy

1. The problem statement, all variables and given/known data
Determine the angular momentum of the Earth about its rotation axis (assume the Earth is a uniform sphere).

2. Relevant equations
L = Iω
I = (2/5)Mr^2
ω = 2$\pi$/T

3. The attempt at a solution
I = (2/5)(6.0 X 10^24 kg)(6.4 X 10^6m)^2
ω = 1.992 X 10^-7 rad/sec

L = (2/5)(6.0 X 10^24 kg)(6.4 X 10^6m)^2 * (1.992 X 10^-7 rad/sec)
What I get from this is 1.958 X 10^31 and the answer is supposed to be 7.1 X 10^33. where did I go wrong? Thank you

2. Nov 17, 2013

### TSny

How long does it take the earth to rotate one revolution on its axis?