Checking Up 1. When a spring scale is used to do work pulling a cart to the top of an incline, where has the energy gone when the cart is at rest at the top? 2. Where does the roller coaster get its gravitational potential energy when it is at the top of the first hill? 3. Why do truckers use a ramp when loading a truck if the work required is the same with or without a ramp?

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

it doesn't. it was imagined up in the middle ages.

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.