posted by phys .
can you tell me what i did wrong on this problem
Rigid rods of negligible mass lying along the y axis connect three particles. The system rotates about the x axis with an angular speed of 3.30 rad/s.
a)Find the total rotational kinetic energy evaluated from 1/2 I omega^2
b)Find the tangential speed of each 4kg and 3kg particles
c)Find the total kinetic energy evaluated from Σ mi vi2/2
i don't know why i got these wrong