Posted by **Alex** on Friday, October 19, 2012 at 9:48am.

A uniform rectangular bar with cross-section 66 mm x 54 mm and of length 1.7 m has mass 16kg. It pivots about an axis prependicular to the wider face. The axis is equidistant from the edges and 170 mm from one end. What is the relevant second moment of mass?

- Physics (Difficult) -
**drwls**, Friday, October 19, 2012 at 10:29am
The "wider face" is the pair of 66 mm x 1.7 m parallel faces.

First, get the moment of inertia about an axis passing through the centroid of that face. Call it Icm.

Then, use the parallel axis theorem, which is explained at

http://hyperphysics.phy-astr.gsu.edu/hbase/parax.html

- Physics (Difficult) -
**drwls**, Friday, October 19, 2012 at 10:33am
For the moment of inertia about an axis through the center of mass, see the "cuboid" formula at

http://en.wikipedia.org/wiki/List_of_moments_of_inertia

## Answer This Question

## Related Questions

- physics - Consider two straight bars of uniform cross section made of the same ...
- Physic - Reaction at support and internal axial force resultant Consider two ...
- psuchics - Reaction at support and internal axial force resultant Consider two ...
- physics - A thin non-uniform rod of length L=2.00 m and mass M=9.00 kg is free ...
- Physics - A small 0.13 g bug stands at one end of a thin uniform bar that is ...
- calculus - #3 A solid has a base in the form of the ellipse: x^2/25 + y^2/16 = 1...
- College Physics - A uniform horizontal rod of mass M and length l rotates with ...
- Physics - A 5.80 kg ball is dropped from a height of 14.5 m above one end of a ...
- Calculus - Let R be the region enclosed by the graphs y=e^x, y=x^3, and the y ...
- Physics (Stress & Strain) - A uniform bar 1.900m in length and having a cross ...

More Related Questions