2. You can start a campfire by rubbing two dry sticks together. To create sparks, rest the larger stick on the ground. Press the point of the smaller stick into the
larger stick so that the sticks are at right angles. You then rotate the smaller
stick between your hands. Suppose you begin to see smoke when you rotate the
stick so that you transfer a kinetic energy of 2.15 x 10^J. What is the internal
energy at the point where the sticks meet?

b.a device that inputs heat into a cool object

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.