The force f, of the wind blowing against a building is given by f=cdrhov2 a/2, where v is the wind speed, rho the density of the air, a the cross-sectional area of the building, and cd is a constant termed the drag coefficient. (a) determine the dimensions of the drag coefficient. (b) is this a homogeneous or a non-homogeneous equation? how can you tell? (c) in what unit system is the coefficient defined?

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.