For isolated system: A. kinetic energy is always conserved B. gravitational potential energy is always conserved C. both kinetic energy and gravitational potential energy are always conserved D. total energy is always conserved E. total energy is conserved only if there is no friction

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.

490 n

f=125n a=2.5m/s2