Posted by **Ryan** on Tuesday, December 1, 2009 at 10:55pm.

In the figure below, two particles, each with mass m = 0.82 kg, are fastened to each other, and to a rotation axis at O, by two thin rods, each with length d = 10 cm and mass M = 2.0 kg. The combination rotates around the rotation axis with angular speed รน = 0.34 rad/s.

(a) Measured about O, what is the combination's rotational inertia?

(b) What is the combination's kinetic energy?

The figure looks like this:

Rotation axis-rod-particle-rod-particle

At first I used (1/3)(M)(L^2) to find the moment of inertia but that is not working. I also tried finding the individual kinetic energies and the total kinetic energy (I converted omega to velocity using radius of .2m)but neither worked. I've tried some other methods but just cant seem to get the right answer.

- college physics -
**Harry Houdini**, Monday, November 8, 2010 at 9:35pm
oh.

## Answer This Question

## Related Questions

- physics - Three particles, each of mass 3.0 kg, are fastened to each other and ...
- Physics - An object consists of 5 masses, each of mass m, connected by massless ...
- college physics - In the figure below, two point particles are fixed on an x ...
- physics - In the figure below, two point particles are fixed on an x axis ...
- Physics - Twelve uniform, thin rods of mass M and length L are welded together ...
- Physics - The rigid object shown in Fig. 10-63 consists of three balls and three...
- physics - A helicopter has two blades (see figure), each of which has a mass of ...
- Physics - A helicopter has two blades (see figure), each of which has a mass of ...
- Physics - Three uniform thin rods, each of length L = 16 cm, form an inverted U...
- physics - Three uniform thin rods, each of length L = 16 cm, form an inverted U...

More Related Questions