Mechanical equilibrium: Select one: A. Defines systems in terms of force and this is the only way to analyse mechanical equilibrium. B. Can be found in a system that has velocity if the velocity is equal to a varying quantity. C. There are situations of rotational mechanical equilibrium, and in these, the angular momentum of the object is conserved and the net torque may be a moveable quantity. D. May be expressed in terms of momentum, a system is in equilibrium if the momentum of its parts is equal to a mutable quantity. E. None of the above

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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.