Total Kinetic Energy: Man, Globe, Platform

[spirited]

Homework Statement

A man stands at the center of a turntable that can rotate without friction. He then takes a 1.5 kg globe of the Earth and swings it around his head at the end of a 0.7 m long chain. The world revolves around him every 3.4 s, and the man and the platform have a moment of inertia of 0.5 kgm^2. The angular velocity is 2.71 rad/s in the opposite direction to that of the globe. What is the total Kinetic Energy of the man, the globe, and the platform?

Homework Equations

K = 0.5Mv^2 of the globe + L^2/(2I) of the platform

The Attempt at a Solution

K total = 0.5Mv^2 + L^2/(2I)
K total = 0.5(1.5)(0.7x2pi/3.4)^2 + (0.5x2.71)^2/(2x0.5) = 3.091J

Plz. help... I do not think my answer is right... mainly the equation part...
-Thanks a lot...

 

[ak1948]

Looks right to me.