- #1

- 38

- 0

## Homework Statement

Two particles, each with mass m = 0.85 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 5.6 cm and mass M = 1.2 kg. The combination rotates around the rotation axis with angular speed w = 0.30 rad/s. Measured about O, what are the combination's (a) rotational inertia and (b) kinetic energy?

http://www.lowellphysics.org/beta/Textbook%20Resources/Chapter%2010.%20Rotation/Problems/c10x10_12.xform_files/nw0536-n.gif

## Homework Equations

parallel-axis theorem: I = I

_{com}+ Mh^2

rotational inertia for thin rod: I = 1/12ML^2

K = 1/2Iomega^2

## The Attempt at a Solution

I

_{net}= I

_{rod1}+ I

_{particle1}+ I

_{rod2}+I

_{particle2}

I

_{net}= 1/12Md^2 + Md^2 + 1/12M(2d)^2 + M(2d)^2

help!