A 0.77 kg spike is hammered into a railroad
tie. The initial speed of the spike is equal to
3.5 m/s.
If the tie and spike together absorb 88.3
percent of the spike’s initial kinetic energy
as internal energy, calculate the increase in
internal energy of the tie and spike.
Answer in units of J.

inverse v=i*r

nice nice

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.