Rotational Motion Question -- please help 1. The problem statement, all variables and given/known data Estimate the energy stored in the rotational motion of a hurricane. Model the hurricane as a uniform cylinder 300 km and 5 km high, made of air whose mass is 1.3 kg/m^3. Estimate the outer edge of the hurricane to move at a speed of 200 km/h. 2. Relevant equations KE = (1/2)*I*w^2 v= wR For a uniform cylinder, I=(1/2)MR^2 (but it's hollow so would that make a difference, even though you're only given one radius) 3. The attempt at a solution So here's how I started out: KE = (1/2)*I*w^2 v= wR --> Therefore KE = (1/2)[(1/2)MR^2][v/R]^2 The answer is 4E17 J, but I can't seem to get that. Can someone please tell me where I'm going wrong? I've been doing this problem for so long and I'm just not getting what I keep doing wrong. I feel like it might have something to do with the mass I'm using (M=1.3 kg/m^3) or the fact that I'm neglecting the height (h=5km)? It's not supposed to be a difficult problem...please help!