The model airplane in Figure 5.6 is flying at a speed of 14.6 m/s on a horizontal circle of radius 18.7 m. The mass of the plane is 0.918 kg. The person holding the guideline pulls it in until the radius of the circle becomes 14.3 m. The plane speeds up, and the tension in the guideline becomes four times greater. What is the net work done on the plane?

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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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.