Homework Help: physics(check my answer)

Posted by phys on Tuesday, April 6, 2010 at 11:32pm.

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.
4kg,y=3.00m
2kg,y=-2.00m
3kg,y=-4.00m

a)Find the total rotational kinetic energy evaluated from 1/2 I omega^2
4(3^2)+2(2^2)+3(4^2)=92
.5(92)(3.3)^2
b)Find the tangential speed of each 4kg and 3kg particles
4kg: 4x3.3=13.2m/s
3kg: 3x3.3=9.9m/s

c)Find the total kinetic energy evaluated from Σ mi vi2/2

.5(4kg)(6^2)+.5(2kg)(4^2)+.5(3kg)(8^2)=184

i dont know why i got these wrong

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