What are large glowing balls of plasma held together by their own gravity called?

What occurs during a combustion reaction

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.

Two point charges are separated by a certain distance. how does the strength of the electric field produced by the first charge