By inspection, the z centroidal axis of the entire cross-section passes through the centroids of the left and right vertical flanges and the horizontal web. Calculate Iz, fl the moment of inertia for the left vertical flange about the z centroidal axis. Note that each flange is rectangular with dimensions 16mm x 170mm, so the moments of inertia for the left and right vertical flanges are identical.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.