Posted by **wolfpak** on Thursday, March 22, 2007 at 5:15pm.

The masses and coordinates of four particles are as follows: 40 g, x = -4.0 cm, y = 5.0 cm; 30 g, x = 5, y = 0.0 cm; 40 g, x = –5.0 cm, y = 3.0 cm; 20 g, x = 3.0 cm, y = 2.0 cm. What are the rotational inertias of this collection about the (a) x, (b) y, and (c) z axes?

>>>>>>>>>>>>>>>>>>>>>>.

So I used Rotational Inertia = mL^2

For x I did: (40)(-4)^2+(30)(5)^2+(40)(-5)^2+(20)(3)^2

After adding these up I have 2570 g*cm^2 which is the wrong answer. Can you please point me in the right direction? thanks!

well, you did the one for rotation about x=0, the y axis, not the x axis. The numbers are correct.

AH! Thank you!!!

## Answer This Question

## Related Questions

- PHYSICS - The masses and coordinates of four particles are indicated in the ...
- Physics 203 ( College) - Four particles, one at each of the four corners of a ...
- Physics - Four particles in the xy plane have the following masses and ...
- college physics - Each of four particles moves along an x-axis. Their ...
- Science - Four particles in the xy plane have the following masses and ...
- Physics - Four particles in the xy plane have the following masses and ...
- physics - four particles each of mass 1kg at rest of four corners of a square as...
- Physics - Four point masses are arranged on the xy plane as follows. Mass1 = 47....
- physics - four particles of masses 1kg, 2kg,3kg, and 4kg are at vertices of a ...
- Physics - Four identical masses of 800kg each are placed at the corners of a ...

More Related Questions